JP2006261350A - Resistor paste and resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To form a resistor exhibiting a desired resistance and achieving excellent TCR characteristics, and the like. <P>SOLUTION: A resistor paste is produced by dispersing a resistor composition containing a conductive material and a glass composition into an organic vehicle wherein the resistor composition contains a composite oxide containing an alkaline metal. The composite oxide contains an alkaline metal and at least one kind selected from Nb, Ta and Ti. The composite oxide is at least one kind selected from LiNbO<SB>3</SB>, LiTaO<SB>3</SB>, Li<SB>2</SB>TiO<SB>3</SB>, NaNbO<SB>3</SB>, NaTaO<SB>3</SB>, Na<SB>2</SB>TiO<SB>3</SB>, Na<SB>2</SB>Ti<SB>3</SB>O<SB>7</SB>, KNbO<SB>3</SB>, KTaO<SB>3</SB>, and K<SB>2</SB>TiO<SB>3</SB>. A compound having perovskite crystal structure is contained as the conductive material. The compound as the conductive material is at least one kind selected from CaRuO<SB>3</SB>, SrRuO<SB>3</SB>and BaRuO<SB>3</SB>. The resistor composition contains a compound having perovskite crystal structure as additive. The compound as additive is a composite oxide containing an alkaline earth metal and Ti. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a resistor paste containing a conductive material and a glass composition, and further relates to a resistor formed using such a resistor paste.

In a resistor formed by applying a thick film resistor paste containing an insulating material (glass) or a conductive material on a substrate and firing it, a ruthenium oxide (RuO ₂ ) or lead ruthenium composite is usually used as the conductive material. Particles (conductive particles) such as oxide (Pb ₂ Ru ₂ O ₆ ) are used, and PbO-based glass is used as the glass. Glass functions as a binder between the conductive particles and the substrate, and the resistance value can be adjusted by the ratio of the conductive particles to the glass.

  In recent years, environmental problems have been actively discussed. For example, in solder materials and the like, it is required to eliminate lead. Resistors are no exception. Therefore, in consideration of the environment, the use of lead ruthenium composite oxide as a conductive material as well as PbO-based glass must be avoided. Under these circumstances, research has been conducted on lead-free resistor pastes that exclude lead from the glass and conductive materials used. For example, Ru composite oxides have higher resistance values than ruthenium oxide. Therefore, it is considered promising as a conductive material to replace lead ruthenium composite oxide.

By the way, when a material that does not substantially contain lead is used as a conductive material or a glass composition constituting the resistor paste, there arises a problem that the temperature characteristics (TCR) characteristics of the resistor are remarkably deteriorated. Therefore, for example, in Patent Document 1, WO ₃ is added as an additive for the purpose of improving TCR characteristics. For example, Patent Document 2 and Patent Document 3 refer to compounds having a perovskite crystal structure such as CaTiO ₃ (hereinafter referred to as perovskite compounds) for the purpose of improving TCR characteristics and the like of lead-free thick film resistors. ) As an additive.
JP 2002-198203 A JP 2003-197405 A JP 2004-356266 A

  However, the resistors described in Patent Documents 1 to 3 have not yet reached the TCR level of the conventional lead-based resistors, and the inconvenience of TCR deterioration has not been completely eliminated.

In addition, as the Ru composite oxide used for the conductive material of the lead-free resistor, a perovskite type compound such as CaRuO ₃ or SrRuO ₃ is typical. For example, these perovskite type compounds are in the state of the resistor paste. That is, when heat treatment (firing) is performed in a state of being mixed with glass, it is easily decomposed into ruthenium oxide. As a result, there is a problem that a desired resistance value cannot be obtained in the obtained resistor. Similarly, a compound having a perovskite crystal structure added as an additive also has a problem that when it is mixed with glass as a resistor paste and subjected to heat treatment, it cannot be easily decomposed to perform its function.

  The present invention has been proposed in view of such a conventional situation, and provides a resistor paste that is excellent in TCR characteristics and the like and capable of forming a resistor exhibiting a desired resistance value. Objective. Another object of the present invention is to provide a resistor using the resistor paste.

  In order to achieve the above-mentioned object, the present inventor has intensively studied for a long time. As a result, it has been found that the combined use of two types of glass compositions having a specific composition is extremely useful for improving the TCR and suppressing the decomposition of a compound having a perovskite crystal structure.

  The present invention has been completed based on such findings. That is, the resistor paste according to the present invention is a resistor paste in which a resistor composition containing a conductive material and a glass composition is dispersed in an organic vehicle, and the glass composition is an alkaline earth It contains the 1st glass composition containing a metal and the 2nd glass composition containing an alkali metal, It is characterized by the above-mentioned. Moreover, the resistor according to the present invention is formed using the resistor paste.

  In the present invention, it is important that the first glass composition containing an alkaline earth metal and the second glass composition containing an alkali metal coexist in the resistor paste. The use of the two types of glass compositions is effective in improving the TCR of a resistor formed by baking a resistor paste, and is also effective from the viewpoint of suppressing decomposition of a perovskite type compound, for example.

  The perovskite-type compound contained as a conductive material or additive in the resistor paste is easily decomposed and loses its function when the resistor paste is baked into a resistor. For example, when the Ru composite oxide, which is a conductive material, is decomposed into ruthenium oxide or the like by the baking, the resistance value or the like greatly fluctuates, causing a problem such as a large deviation from the desired resistance value.

  In the present invention, since the two types of glass compositions coexist in the resistor paste, decomposition of the conductive material and additives is suppressed, and the above inconvenience is solved. Although the details are unknown about the reason, it has been experimentally confirmed that when the resistor paste is baked in the state where the two kinds of glass compositions are used in combination, the decomposition of the perovskite type compound is sufficiently suppressed. It has been.

In addition, in patent document 1-patent document 3, although the alkaline-earth metal and alkali metal are disclosed as a component of glass, conventionally, it is assumed only using one type of glass composition independently. In the present invention, a first glass composition containing an alkaline earth metal such as CaO glass and a _second glass composition containing an alkali metal such as Na ₂ O glass are prepared in advance, and these are mixed. In the case of using both the alkaline earth metal and the alkali metal in the glass composition and using the glass alone, when using the alkaline earth metal-containing glass alone As compared with any of the cases where the alkali metal-containing glass is used alone, the TCR improvement effect and the effect of suppressing the resistance value fluctuation are remarkably exhibited.

  According to the present invention, it is possible to obtain a resistor exhibiting a desired resistance value while improving TCR characteristics and suppressing decomposition of, for example, a conductive material or a perovskite compound as an additive.

  Hereinafter, the resistor paste and the resistor to which the present invention is applied will be described in detail.

  The resistor paste of the present invention includes a conductive material substantially free of lead, a glass composition, and an additive, and a resistor composition comprising these components is mixed with an organic vehicle. In particular, the present invention is characterized in that the glass composition contains at least two kinds of glass compositions, that is, a first glass composition containing an alkaline earth metal and a second glass composition containing an alkali metal. There is.

The conductive material has a role of imparting conductivity to the resistor which is a structure by being dispersed in the glass composition which is an insulator. As the conductive material, a conductive material that does not substantially contain lead is used. For example, a conductive material containing Ru is used. Examples of the conductive material containing Ru include RuO ₂ and Ru composite oxide. As the Ru composite oxide, one or more selected from CaRuO ₃ , SrRuO ₃ , BaRuO ₃ , and Bi ₂ Ru ₂ O ₇ are preferable. In particular, it is preferable to apply the present invention when a perovskite type compound such as CaRuO ₃ , SrRuO ₃ , BaRuO ₃ or the like is used which is represented by ABO ₃ .

  When the glass composition is a resistor, it has a role of binding the conductive material and the additive to the substrate in the resistor. The glass composition of the present invention contains a first glass composition containing an alkaline earth metal and a second glass composition containing an alkali metal. By using these two types of glass compositions in combination, it is possible to suppress the decomposition of the perovskite type compound contained in the resistor paste as a conductive material or additive, and to form a resistor having excellent characteristics. In the present invention, since the glass composition itself exhibits the function of suppressing the decomposition of the perovskite type compound, it is also an advantage that the addition of another compound for the purpose of suppressing the decomposition of the perovskite type compound is basically unnecessary.

  In the resistor paste, it is preferable to contain a first glass composition containing an alkaline earth metal as a main component and a second glass composition containing an alkali metal as a subcomponent. Specifically, it is preferable that the content of the first glass composition is larger than the content of the second glass composition, and thereby a resistor having excellent characteristics is realized.

Here, first, the first glass composition containing an alkaline earth metal will be described. The first glass composition can contain a modified oxide component, a network-forming oxide component, and the like. Examples of the main modifying oxide component include alkaline earth metal oxides, specifically, at least one selected from CaO, SrO, and BaO. Examples of the network forming oxide component include B ₂ O ₃ and SiO ₂ . In addition to the main modified oxide component, it is preferable that at least one of ZrO ₂ and Al ₂ O ₃ is contained as the other modified oxide component. Further, the first glass composition may contain any metal oxide as the third modified oxide component. Examples of the metal oxide include MgO, TiO ₂ , SnO ₂ , CuO, NiO, ZnO, CoO, MnO, Fe ₂ O ₃ , Cr ₂ O ₃ , Y ₂ O ₃ , V ₂ O ₅ , Ta ₂ O ₅ , Nb ₂ O _{5 and the} like can be mentioned, among which Ta ₂ O ₅ and Nb ₂ O ₅ are oxides suitable as components for a resistor paste having high resistance.

  The content of each component in the first glass composition will be described. The main modified oxide component in the first glass composition is preferably contained in the first glass composition in an amount of 13 mol% to 45 mol%. When the content of the main modifying oxide component is less than the above range, the reactivity with the conductive material is lowered, and there is a possibility that the TCR characteristic and the STOL characteristic are deteriorated. On the other hand, when the content of the main modifying oxide component exceeds the above range, excessive metal oxide may be precipitated when the resistor is formed, and the characteristics may be deteriorated.

  The network-forming oxide component is preferably contained in the first glass composition in an amount of 35 mol% to 80 mol%. When the content of the network-forming oxide component is small, it is difficult to vitrify the composition. Therefore, when the resistor is formed, excessive metal oxide is precipitated, and the reliability may be significantly reduced. On the other hand, when the content of the network-forming oxide component is too large, the water resistance of the glass composition is lowered, and thus there is a possibility that the reliability when a resistor is used is significantly lowered. Moreover, when the softening point of a glass composition becomes high and a resistor is formed at a predetermined firing temperature, sintering of the resistor becomes insufficient, and the reliability may be significantly reduced.

  The other modified oxide component is preferably contained in the first glass composition in an amount of 0 mol% to 11 mol%. When the content of the other modified oxide component is less than the above range, the water resistance of the glass composition is lowered, and thus there is a possibility that the reliability when a resistor is used is significantly lowered. On the other hand, when the content of the other modified oxide component exceeds the above range, excessive metal oxide may be precipitated when the resistor is formed, which may deteriorate the characteristics.

  Moreover, it is preferable that content in the 1st glass composition of a 3rd modified oxide component is 0-10 mol%. When the content of the third modified oxide component exceeds the above range, it may cause a deterioration in characteristics, although it varies depending on the kind of the added oxide.

Next, the 2nd glass composition containing an alkali metal is demonstrated. The second glass composition can contain a modified oxide component, a network-forming oxide component, and the like. Examples of the main modifying oxide component include alkali metal oxides, specifically, at least one selected from Li ₂ O, Na ₂ O, and K ₂ O. Components other than the main modified oxide component in the second glass composition, that is, the network-forming oxide component, other modified oxide components, and the third modified oxide component are the same as those in the first glass composition. These are the same as the network-forming oxide component, the other modified oxide component, and the third modified oxide component, and can be appropriately selected from these.

  The content of each component in the second glass composition will be described. The main modified oxide component in the second glass composition is preferably contained in the second glass composition in an amount of 10 mol% to 50 mol%. When the content of the main modifying oxide component is less than the above range, the effect of suppressing the decomposition of the perovskite type compound contained as the conductive material or additive becomes insufficient, and the TCR characteristics may be deteriorated. On the other hand, when the content of the main modifying oxide component exceeds the above range, excessive metal oxide may be precipitated when the resistor is formed, and the characteristics may be deteriorated.

  The network forming oxide component is preferably contained in the second glass composition in an amount of 35 mol% to 80 mol%. When the content of the network-forming oxide component is small, it is difficult to vitrify the composition. Therefore, when the resistor is formed, excessive metal oxide is precipitated, and the reliability may be significantly reduced. On the other hand, when the content of the network-forming oxide component is too large, the water resistance of the glass composition is lowered, and thus there is a possibility that the reliability when a resistor is used is significantly lowered. Moreover, when the softening point of a glass composition becomes high and a resistor is formed at a predetermined firing temperature, sintering of the resistor becomes insufficient, and the reliability may be significantly reduced.

  The other modified oxide component is preferably contained in the second glass composition in an amount of 0 mol% to 11 mol%. When the content of the other modified oxide component is less than the above range, the water resistance of the glass composition is lowered, and thus there is a possibility that the reliability when a resistor is used is significantly lowered. On the other hand, when the content of the other modified oxide component exceeds the above range, excessive metal oxide may be precipitated when the resistor is formed, which may deteriorate the characteristics.

  Moreover, it is preferable that content in the 2nd glass composition of a 3rd modification oxide component is 0-10 mol%. When the content of the third modified oxide component exceeds the above range, it may cause a deterioration in characteristics, although it varies depending on the kind of the added oxide.

In preparing the second glass composition, an unstable alkali metal oxide such as Li ₂ O, K ₂ O, or Na ₂ O is not used as it is as a raw material, but usually LiCO ₃ , using the carbonate such as KCO _3, NaCO _3, they were mixed with other glass component material may be vitrified.

  In the present invention, as the glass composition, it is preferable to use a lead-free glass composition that does not substantially contain lead for environmental protection. In the present invention, “substantially free of lead” means not containing lead exceeding the impurity level, and the amount of impurity level (for example, the content in the glass composition is 0.05 mass). % Or less), it may be contained. Lead may be contained in a trace amount as an inevitable impurity.

  The resistor paste of the present invention contains the conductive material and the glass composition as a basic composition in the resistor composition, but may contain additives as necessary.

The _{additive, BaTiO 3, SrTiO 3, CaTiO} 3, MgTiO 3, CoTiO 3, NiTiO compound having a perovskite crystal structure, such as _3. Among these, it is preferable to add a composite oxide containing an alkaline earth metal such as BaTiO ₃ , SrTiO ₃ , CaTiO ₃ , MgTiO ₃ and Ti to the resistor paste.

  It is also effective to add metal materials in combination as additives. In this case, as the metal material, fine particles of any conductive metal can be used, but from the viewpoint of combination with the composite oxide, in addition to simple metals such as Ag and Pd, Ag-Pd, etc. An alloy of Ag or Pd is suitable.

Moreover, STOL can be improved by using a metal oxide, especially CuO, Cu ₂ O, or the like as other additives.

It is preferable to optimize the composition of the resistor component including the aforementioned components. Specifically, the composition of the resistor composition is:
Conductive material: 30-80% by mass
Glass composition: 10 to 55% by mass
Composite oxide containing alkaline earth metal and Ti: 0.1 to 25% by mass
Metal material: 0 to 20% by mass
Other additives: 0 to 10% by mass
It is preferable that

  The composition of the resistor composition is determined from the viewpoint of TCR and STOL in addition to the resistance value, and by setting the above range, the TCR and STOL can be surely made small in each resistance value.

  The resistor composition described above is made into a resistor paste by being dispersed in an organic vehicle. However, any organic vehicle for resistor paste can be used for this type of resistor paste. For example, a binder resin such as ethyl cellulose, polyvinyl butyral, methacrylic resin, or butyl methacrylate and a solvent such as terpineol, butyl carbitol, butyl carbitol acetate, toluene, various alcohols, or xylene can be used. At this time, various dispersants, activators, plasticizers, and the like can be appropriately used in accordance with the application.

  Although it is the compounding ratio of the said organic vehicle, the ratio (W2 / W1) of the mass (W1) of a resistor composition and the mass (W2) of an organic vehicle is 0.25-4 (W2: W1 = 1: 0). .25 to 1: 4). More preferably, the ratio (W2 / W1) is 0.5-2. If the ratio is outside the above range, a resistor paste having a viscosity suitable for forming a resistor on, for example, a substrate may not be obtained.

In order to form the resistor, the resistor paste containing the above-described components may be printed (applied) on the substrate by a method such as screen printing and fired at a temperature of about 850 ° C. As the substrate, a dielectric substrate such as an Al ₂ O ₃ substrate or a BaTiO ₃ substrate, a low-temperature fired ceramic substrate, an AlN substrate, or the like can be used. The substrate form may be any of a single layer substrate, a composite substrate, and a multilayer substrate. In the case of a multilayer substrate, the resistor may be formed on the surface or inside.

  As described above, when the resistor is formed, various perovskite compounds as a conductive material and an additive are baked (heat treated) in a state of being mixed with a glass composition. Perovskite type compounds are decomposed and cannot fully perform their respective functions.

Therefore, in the present invention, for example, a conductive material (CaRuO ₃ , SrRuO ₃ , BaRuO _3, etc.), a complex oxide (MgTiO ₃ , CaTiO ₃ , SrTiO ₃ , SrTiO ₃ , In the case of using a perovskite type compound in the resistor paste such as BaTiO ₃ or the like, a first glass composition containing an alkaline earth metal and a second glass composition containing an alkali metal are used in combination as the glass composition. Thereby, decomposition of the perovskite type compound used as the conductive material or additive is suppressed, and a resistor exhibiting a desired resistance value can be obtained. In addition, a resistor having excellent TCR characteristics can be formed.

  In forming the resistor, a conductive pattern to be an electrode is usually formed on the substrate, and this conductive pattern is printed by, for example, a conductive paste containing an Ag-based highly conductive material containing Ag, Pt, Pd, or the like. Can be formed. Further, a protective film (overglaze) such as a glass film may be formed on the surface of the formed resistor.

  The electronic component to which the resistor of the present invention can be applied is not particularly limited. For example, a single-layer or multi-layer circuit board, a resistor such as a chip resistor, an isolator element, a CR composite element, a module element, and a laminated layer Capacitors such as chip capacitors, inductors and the like can be mentioned, and the present invention can also be applied to electrode portions such as capacitors and inductors.

  Hereinafter, specific examples of the present invention will be described based on experimental results.

<Production of first glass composition>
A predetermined amount of raw materials such as B ₂ O ₃ , SiO ₂ , CaCO ₃ , SrCO ₃ , BaCO ₃ , ZrO ₂ , Ta ₂ O ₅ were weighed, mixed in a ball mill and dried. The obtained powder was heated to 1300 ° C. at a rate of 5 ° C./minute, held at that temperature for 1 hour, and then rapidly cooled by dropping into water to form a glass. The obtained vitrified product was pulverized with a ball mill to obtain glass powder. A first glass composition having a composition (mol%) shown in Table 1 was produced by changing the ratio of each component. In addition, although it is the same also in the following tables, the blank in a table | surface represents that the said component is not contained (content 0).

<Production of second glass composition>
_{B 2 O 3, SiO 2,} LiCO 3, KCO 3, NaCO 3, ZrO 2, Ta 2 O 5 or the like of the raw materials were weighed in predetermined amounts, and dried and mixed with a ball mill. The obtained powder was heated to 1300 ° C. at a rate of 5 ° C./minute, held at that temperature for 1 hour, and then rapidly cooled by dropping into water to form a glass. The obtained vitrified product was pulverized with a ball mill to obtain glass powder. A second glass composition having the composition shown in Table 2 was produced by changing the ratio of each component.

<Conductive material>
CaRuO ₃ and SrRuO ₃ were prepared as conductive materials.

<Preparation of organic vehicle>
Using ethyl cellulose as the binder and terpineol as the organic solvent, the organic solvent was prepared by dissolving the binder while heating and stirring the organic solvent.

<Preparation of resistor paste>
The conductive material, the glass composition, and the organic vehicle were weighed so as to have each composition and kneaded with a three-roll mill to obtain a resistor paste. The ratio of the total mass of the conductive material and glass composition powder to the mass of the organic vehicle is 1: 0.25 to 1 in terms of mass ratio so that the obtained resistor paste has a viscosity suitable for screen printing. : Prepared in a range of 4 to prepare a resistor paste.

<Fabrication of resistor>
An Ag—Pt conductor paste was screen-printed in a predetermined shape on an alumina substrate having a purity of 96% and dried. The Ag ratio in the Ag-Pt conductor paste was 95% by mass, and the Pt ratio was 5% by mass. This alumina substrate was placed in a belt furnace and baked in a pattern of 1 hour from charging to discharging. The baking temperature at this time was 850 ° C., and the holding time at that temperature was 10 minutes.

  On the alumina substrate on which the conductor was formed in this manner, the resistor paste prepared previously was applied in a pattern of a predetermined shape (1 mm × 1 mm square shape) by screen printing and dried. Thereafter, the resistor paste was baked under the same conditions as the conductor baking to obtain a resistor.

<Evaluation of resistor characteristics>
(1) Resistance value
Measured with Agilent Technologies product number 34401A. The average value of 24 samples was determined.

(2) TCR
The resistance value change rate when the temperature was changed to −55 ° C. and 125 ° C. was obtained based on the room temperature of 25 ° C. The average value of 10 samples. When resistance values of −55 ° C., 25 ° C., and 125 ° C. are R-55, R25, and R125 (Ω / □), CTCR and HTCR are expressed as follows.
CTCR (ppm / ° C) = [(R-55-R25) / R25 / 80] x 1000000
HTCR (ppm / ° C) = [(R125-R25) / R25 / 100] x 1000000
Of CTCR and HTCR, the larger absolute value was taken as the TCR value.

<Experiment 1>
In Experiment 1, CaRuO ₃ was used as the conductive material. The ratio of the glass composition in the resistor composition was 60% by mass, and the ratio of CaRuO ₃ was 40% by mass. Moreover, the ratio of the 1st glass composition in a glass composition was 90 mass%, and the ratio of the 2nd glass composition was 10 mass%. The first glass composition shown in Table 1 and the second glass composition shown in Table 2 were combined as shown in Table 3 and contained in a resistor paste, and a resistor was produced using this. Table 3 shows the composition and characteristics evaluation results of the glass composition in each sample.

  As shown in Table 3, in the sample 33 using only the first glass composition (glass 1-21) containing an alkaline earth metal, the TCR characteristics are remarkably deteriorated. Moreover, the sample 34 using only the 2nd glass composition (glass 2-2) containing an alkali metal was also inferior to a TCR characteristic. On the other hand, as shown in Samples 1 to 32, the first glass composition containing an alkaline earth metal and the second glass composition containing an alkali metal are used in combination, thereby exhibiting high resistance. The TCR characteristics are greatly improved.

In particular, in the sample 7 to the sample 16 and the sample 23 to the sample 32 in which the first glass composition and the second glass composition are used in combination, and the components in these glass compositions are appropriately set, high resistance is obtained. In addition to showing a value, a good TCR characteristic is realized. On the other hand, in the samples 1 to 6 in which the addition amounts of CaO, B ₂ O ₃ and SiO ₂ , ZrO ₂ , Ta ₂ O ₅ in the first glass composition are outside the appropriate range, the TCR characteristics are improved. The effect was insufficient. In Samples 17 to 22 in which the addition amounts of Na ₂ O, ZrO ₂ , and Ta ₂ O ₅ in the second glass composition are outside the proper range, the TCR characteristics are large values exceeding ± 500 ppm / ° C. Show.

<Experiment 2>
In Experiment 2, the effects of the blending ratio of the first glass composition and the second glass composition and the difference in the conductive material were examined.

In order to examine the blending ratio of the first glass composition and the second glass composition, Sample 35 and Sample 36 were prepared. In Sample 35 and Sample 36, CaRuO ₃ was used as the conductive material, the ratio of the glass composition in the resistor composition was 60 mass%, and the ratio of CaRuO ₃ was 40 mass%. And in the sample 35, the ratio of the 1st glass composition (glass 1-10) in a glass composition was 60 mass%, and the ratio of the 2nd glass composition (glass 2-7) was 40 mass%. . On the other hand, in the sample 36, the ratio of the 1st glass composition (glass 1-10) in a glass composition was 40 mass%, and the ratio of the 2nd glass composition (glass 2-7) was 60 mass%. .

Further, a resistor was fabricated in the same manner as the sample 35 except that SrRuO ₃ was used as the conductive material. This was designated as Sample 37. Table 4 shows the composition and characteristics evaluation results of the glass composition in each of these samples.

  When the sample 35 and the sample 36 are compared, the TCR characteristic is deteriorated in the sample 36 having a high blending ratio of the second glass composition. From this, it can be seen that a resistor having good TCR characteristics can be obtained by making the content of the first glass composition in the glass composition larger than the content of the second glass composition.

  Moreover, as shown in the sample 37, by using the first glass composition and the second glass composition each having an appropriate composition in an appropriate blending amount, it is favorable regardless of the type of the conductive material. A characteristic resistor is realized.

Claims (11)

A resistor paste in which a resistor composition containing a conductive material and a glass composition is dispersed in an organic vehicle,
The resistor paste, wherein the glass composition contains a first glass composition containing an alkaline earth metal and a second glass composition containing an alkali metal. The first glass composition is
At least one selected from CaO, SrO and BaO;
The resistor paste according to claim 1, comprising at least one selected from B ₂ O ₃ and SiO ₂ . The first glass composition is
At least one selected from CaO, SrO and BaO is 13 mol% to 45 mol%,
B ₂ O ₃ and at least one selected from SiO ₂ 35 mol% to 80 mol%,
At least one selected from ZrO _2, and _Al 2 _{O 3} 0 mol% to 11 mol%,
_3. The resistor paste according to claim 2, comprising 0 mol% to 10 mol% of at least one selected from Ta ₂ O ₅ and Nb ₂ O ₅ . The second glass composition is
At least one selected from Li ₂ O, Na ₂ O and K ₂ O;
The resistor paste according to claim 1, comprising at least one selected from B ₂ O ₃ and SiO ₂ . The second glass composition is
At least one selected from Li ₂ O, Na ₂ O and K ₂ O is 13 mol% to 45 mol%,
B ₂ O ₃ and at least one selected from SiO ₂ 35 mol% to 80 mol%,
At least one selected from ZrO _2, and _Al 2 _{O 3} 0 mol% to 11 mol%,
_5. The resistor paste according to claim 4, comprising 0 mol% to 10 mol% of at least one selected from Ta ₂ O ₅ and Nb ₂ O ₅ .   The resistor paste according to any one of claims 1 to 5, wherein the content of the first glass composition is larger than the content of the second glass composition.   The resistor paste according to claim 1, wherein the conductive material is a compound having a perovskite crystal structure. The resistor paste according to claim 7, wherein the compound is at least one selected from CaRuO ₃ , SrRuO ₃ , and BaRuO ₃ .   The resistor paste according to any one of claims 1 to 8, wherein the resistor composition contains a compound having a perovskite crystal structure as an additive.   The resistor paste according to claim 9, wherein the compound is a composite oxide containing an alkaline earth metal and Ti.   A resistor formed using the resistor paste according to claim 1.