WO2011016325A1 - 透明ジルコニア焼結体及びその製造方法、並びにその用途 - Google Patents
透明ジルコニア焼結体及びその製造方法、並びにその用途 Download PDFInfo
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- C04B35/48—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates
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- C04B35/49—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on zirconium or hafnium oxides, zirconates, zircon or hafnates containing also titanium oxides or titanates
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Definitions
- Zirconia single crystals are glossy and transparent, so they are used for jewelry as cubic zirconia.
- single crystals are difficult to process into a desired shape, and there are problems such as restrictions on the size obtained.
- the present invention provides a zirconia sintered body having both transparency and mechanical strength, a method for producing the same, and a use thereof.
- the present inventors have obtained a high mechanical strength and translucency with a zirconia sintered body having a sintered crystal grain size of 10 ⁇ m or less. As a result, the present invention has been completed.
- the zirconia sintered body of the present invention has high translucency with an average crystal grain size of 10 ⁇ m or less, it has high mechanical strength at the same time.
- the zirconia sintered body of the present invention is a sintered body having a transmittance comparable to the theoretical value.
- the zirconia sintered body of the present invention preferably contains 7 mol% or more and 30 mol% or less of yttria as a stabilizer, more preferably 8 mol% or more and 15 mol% or less.
- yttria the crystal structure of the zirconia sintered body is stabilized.
- the crystal phase of the zirconia sintered body can be made only of cubic crystals (fluorite structure).
- the yttria content is less than 7 mol%, tetragonal crystals are likely to be mixed in addition to cubic crystals, and the translucency tends to be lowered.
- other stabilizers such as lanthanum rare earth oxides, Ca, Mg and the like may be contained in a small amount within a range that does not change the cubic crystal and does not lower the translucency. Good.
- the crystal phase of the zirconia sintered body of the present invention preferably has a cubic fluorite structure. Since cubic crystals have no optical anisotropy, particularly high transparency can be obtained when the individual crystals of the polycrystalline body of the zirconia sintered body are cubic.
- the following conditions can be applied as sintering conditions for the primary sintered body that satisfies the above physical properties.
- the sintering temperature of the low temperature sintering method is 1200 ° C. or higher and 1300 ° C. or lower, preferably 1230 ° C. or higher and 1280 ° C. or lower. Below 1200 ° C., it is difficult to obtain a primary sintered body having a relative density of 92% or higher even when held for a long time. On the other hand, when it exceeds 1300 ° C., crystal grains of the primary sintered body grow, and the average crystal The particle size is 1 ⁇ m or more. In order to suppress the growth of crystal grains, it is more preferable not to exceed 1280 ° C.
- the temperature range of 1200 ° C. or more and 1300 ° C. or less is a temperature range in which densification is difficult, and is generally a range that is not used as a sintering condition for the primary sintered body. It is possible to achieve densification while suppressing the growth of the material.
- Another preferred primary sintering method is sintering that does not hold at the sintering temperature with a sintering temperature of 1350 ° C. or more and 1500 ° C. or less and a temperature increase rate of 500 ° C./hour or more (hereinafter referred to as “high-speed sintering”). It is called "the law").
- the heating rate in the high-speed sintering method is 500 ° C./hour or more, preferably 1000 ° C./hour or more.
- the heating rate is less than 500 ° C./hour, the time until the sintering temperature is reached becomes long, and the crystal grains of the primary sintered body tend to grow.
- the sintering temperature in the high-speed sintering method is preferably 1350 ° C. or more and 1500 ° C. or less, and more preferably 1400 ° C. or more and 1500 ° C. or less. If the sintering temperature is less than 1350 ° C., it is difficult to make the relative density of the primary sintered body 92% or more, and if it exceeds 1500 ° C., it is difficult to make the average crystal grain size of the primary sintered body 1 ⁇ m or less. It becomes.
- the rate of temperature decrease is fast, and normal cooling where heating is stopped when the sintering temperature is reached is sufficient.
- the zirconia powder used in the present invention is not particularly limited as long as a primary sintered body having an average crystal grain size of 1 ⁇ m or less, a relative density of 92% or more, and a crystal phase consisting of only cubic crystals is obtained. It is preferable to use a conductive powder. As the powder characteristics, those having a specific surface area of 5 m 2 / g to 20 m 2 / g and a crystallite diameter of 10 nm to 70 nm are preferable.
- the zirconia powder used in the present invention preferably contains a stabilizer. Moreover, it is more preferable that yttria is contained as a stabilizer in an amount of 7 mol% to 30 mol%, and further preferably 8 mol% to 15 mol%.
- zirconia powder examples include commercially available zirconia powder or powder prepared by a neutralization method or a hydrolysis method, but it is particularly preferable to use a hydrolyzed powder having excellent sinterability.
- the method of molding the zirconia powder is a method that can obtain a molded body having an appropriate shape for use in primary sintering, and press molding or cold isostatic pressing generally used for molding ceramics. Molding methods such as molding, cast molding, extrusion molding, and injection molding can be used.
- the primary sintering can be performed under atmospheric pressure and in an atmosphere such as air, oxygen, vacuum, etc., and the simplest atmosphere is preferably sintering in the air.
- the primary sintered body is subjected to HIP treatment to obtain a zirconia sintered body.
- the HIP treatment is preferably performed at a treatment temperature of 1250 ° C. or higher and lower than 1600 ° C., more preferably 1250 ° C. or higher and 1500 ° C. or lower.
- the HIP treatment temperature is less than 1250 ° C., the sintered density of the obtained sintered body is difficult to increase, and when it is 1600 ° C. or higher, the average crystal grain size of the obtained zirconia sintered body greatly exceeds 10 ⁇ m and the translucency is high. It becomes a sintered body with low mechanical strength.
- the pressure medium for the HIP process is not particularly limited, and for example, a commonly used argon gas can be used. Other gases such as nitrogen and oxygen are also applicable.
- the HIP treatment pressure is preferably 50 MPa or more, more preferably 100 MPa or more and 200 MPa or less.
- linear transmittance is a parameter having the following relational expression.
- Ti Tt ⁇ Td (2) Tt: Total light transmittance (%) Td: diffuse transmittance (%) Ti: Linear transmittance (%) Since the transmittance of the zirconia sintered body of the present invention follows the Lambert-Beer law, the transmittance decreases as the sample becomes thicker.
- the bending test was carried out by a three-point bending test based on JIS R1601 “Fine ceramic bending strength test method”, and an average value of 10 measured values was adopted as an average bending strength.
- the obtained molded body was heated in the atmosphere from room temperature to 1100 ° C. at a temperature rising rate of 400 ° C./hour, then heated from 1100 ° C. to 1280 ° C. at a temperature rising rate of 10 ° C./hour and held at 1280 ° C. for 2 hours. .
- the holding time at 1200 ° C. or higher was 10 hours. After holding, it was allowed to cool to obtain a primary sintered body (sample number: No. 1).
- the primary sintered body (sample number: No. 1) was placed in an alumina crucible and subjected to HIP treatment under the conditions of a heating rate of 400 ° C./hour, a processing temperature of 1400 ° C., an argon gas pressure of 150 MPa, and a holding time of 1 hour. After the HIP treatment, the sintered body was annealed in air at 1000 ° C. for 1 hour to obtain a zirconia sintered body.
- the density, average crystal grain size, linear transmittance (and total light transmittance), and bending strength of the obtained zirconia sintered body were measured, the results are shown in Table 2, and the sintered body structure is shown in FIG.
- Example 3 As the sintering conditions for the primary sintered body, the primary sintered body (sample number) was prepared in the same manner as in Example 1 except that the temperature was increased from room temperature to 1260 ° C. at a rate of temperature increase of 400 ° C./hour and held at 1260 ° C. for 20 hours. : No. 3) was obtained. The holding time at 1200 ° C. or higher was 20.2 hours.
- the primary sintered body was processed in the same manner as in the HIP processing conditions of Example 1 except that the processing temperature was 1500 ° C. to obtain a zirconia sintered body.
- the obtained zirconia sintered body has a density of 5.99 g / cm 3 , an average crystal grain size of 5.0 ⁇ m, a linear transmittance (and total light transmittance) of 70% (and 74%), and an average bending The strength was 376 MPa.
- the primary sintered body was processed in the same manner as in the HIP processing conditions of Example 1 except that the processing temperature was 1300 ° C. to obtain a zirconia sintered body.
- the obtained primary sintered body had a density of 5.93 g / cm 3 (relative density 99.0%) and an average crystal grain size of 4.0 ⁇ m.
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Abstract
Description
(1)平均結晶粒径が10μm以下、試料厚さ1mmにおける測定波長600nmの可視光に対する直線透過率が50%以上であることを特徴とするジルコニア焼結体。
(2)好ましくは、平均結晶粒径が8μm以下であることを特徴とする上記(1)に記載のジルコニア焼結体。
(3)好ましくは、平均結晶粒径が5μm以下であることを特徴とする上記(1)又は(2)に記載のジルコニア焼結体。
(4)好ましくは、試料厚さ1mmにおける測定波長600nmの可視光に対する直線透過率が55%以上であることを特徴とする上記(1)乃至(3)のいずれかに記載のジルコニア焼結体。
(6)好ましくは、イットリアを7mol%以上30mol%以下含有することを特徴とする上記(1)乃至(5)のいずれかに記載のジルコニア焼結体。
(7)好ましくは、平均曲げ強度が300MPa以上であることを特徴とする上記(1)乃至(6)のいずれかに記載のジルコニア焼結体。
(8)好ましくは、平均曲げ強度が350MPa以上であることを特徴とする上記(1)乃至(7)のいずれかに記載のジルコニア焼結体。
(9)好ましくは、結晶相が立方晶蛍石型構造であることを特徴とする上記(1)乃至(8)のいずれかに記載のジルコニア焼結体。
(11)好ましくは、一次焼結体が1200℃以上1300℃以下で5時間以上保持されたものであることを特徴とする上記(10)に記載のジルコニア焼結体の製造方法。
(12)好ましくは、一次焼結体が昇温速度500℃/時以上、焼結温度1350℃以上1500℃以下とし、焼結温度での保持をせずに焼結されたものであることを特徴とする上記(10)に記載のジルコニア焼結体の製造方法。
(13)好ましくは、HIP処理を1250℃以上1600℃未満、50MPa以上で行うことを特徴とする上記(10)乃至(12)のいずれかに記載のジルコニア焼結体の製造方法。
本発明のジルコニア焼結体の平均結晶粒径は10μm以下であり、好ましくは8μm以下、より好ましくは5μm以下、さらに好ましくは4μm以下、特に好ましくは1μm以下である。平均結晶粒径が10μm以下であることにより、高い機械的強度、特に高い平均曲げ強度が得られる。
本発明のジルコニア焼結体の製造法は限定されるものではないが、好ましい態様として以下の製法が適用できる。
平均結晶粒径は焼結体の研磨エッチング面の走査電子顕微鏡観察から測定される値であり、具体的には、J.Am.Ceram.Soc.、52[8]443-6(1969)に記載されている方法に従い、(1)式により求められた。
D:平均結晶粒径(μm)
L:任意の直線を横切る粒子の平均長さ(μm)
なお、Lの値は100本以上の実測長さの平均値とした。
直線透過率及び全光線透過率はダブルビーム方式の分光光度計(日本分光株式会社製、V-650型)で測定された。測定試料としては焼結体厚みを1mmに加工し、表面粗さRa=0.02μm以下に両面鏡面研磨したものが用いられた。測定波長領域200nmから800nmの領域で測定し、可視光線領域の600nmの測定波長での透過率を直線透過率及び全光線透過率とした。
Tt:全光線透過率(%)
Td:拡散透過率(%)
Ti:直線透過率(%)
なお、本発明のジルコニア焼結体の透過率はランベルト・ベールの法則に従うため、試料が厚くなると透過率は低下する。
曲げ試験はJISR1601「ファインセラミックスの曲げ強さ試験方法」に基づき3点曲げ試験により実施され、10本の測定値の平均値を平均曲げ強度として採用した。
東ソー株式会社製のジルコニア粉末TZ-8Y(酸化イットリウム8mol%、比表面積13.5m2/g)を用い、一軸プレス(500kgf/cm2)、CIP(2ton/cm2)により加圧成形し、成形体を得た。
一次焼結体の焼結条件を、昇温速度10℃/時で1100℃から1250℃まで加熱し、保持を1250℃で4時間とした以外は実施例1と同様にして一次焼結体(試料番号:No.2)を得た。1200℃以上での保持時間は9時間であった。結果を表1に示した。
一次焼結体の焼結条件として、昇温速度400℃/時で室温から1260℃まで加熱し、1260℃で20時間保持した以外は実施例1と同様な方法で一次焼結体(試料番号:No.3)を得た。1200℃以上での保持時間は20.2時間であった。
昇温速度1000℃/時で室温から1400℃まで加熱し、保持せずに加熱を中止し放冷した以外は実施例1と同様の方法で一次焼結体(試料番号:No.4)を得た。
昇温速度1000℃/時で室温から1430℃まで加熱し、保持せずに加熱を中止し放冷した以外は実施例1と同様の方法で一次焼結体(試料番号:No.6)を得た。
昇温速度100℃/時で1100℃から1400℃まで加熱し、1400℃で2時間保持した以外は実施例1と同様に処理して一次焼結体(試料番号:No.5)を得た。
得られたジルコニア焼結体については、密度5.99g/cm3、平均結晶粒径が4.5μm、直線透過率(及び全光線透過率)が15%(及び55%)、及び平均曲げ強度が356MPaであった。
比較例1と同様の一次焼結体を特許文献1に準じてHIP処理した(処理温度1750℃、圧力150MPa、保持時間1時間)。HIP処理後の焼結体は大気中1100℃で2時間アニールしてジルコニア焼結体を得た。
Claims (13)
- 平均結晶粒径が10μm以下、試料厚さ1mmにおける測定波長600nmの可視光に対する直線透過率が50%以上であることを特徴とするジルコニア焼結体。
- 平均結晶粒径が8μm以下であることを特徴とする請求項1に記載のジルコニア焼結体。
- 平均結晶粒径が5μm以下であることを特徴とする請求項1に記載のジルコニア焼結体。
- 試料厚さ1mmにおける測定波長600nmの可視光に対する直線透過率が55%以上であることを特徴とする請求項1に記載のジルコニア焼結体。
- 試料厚さ1mmにおける測定波長600nmの可視光に対する直線透過率が60%以上であることを特徴とする請求項1に記載のジルコニア焼結体。
- イットリアを7mol%以上30mol%以下含有することを特徴とする請求項1に記載のジルコニア焼結体。
- 平均曲げ強度が300MPa以上であることを特徴とする請求項1に記載のジルコニア焼結体。
- 平均曲げ強度が350MPa以上であることを特徴とする請求項1に記載のジルコニア焼結体。
- 結晶相が立方晶蛍石型構造であることを特徴とする請求項1に記載のジルコニア焼結体。
- ジルコニア粉末を成型し、これを焼結した一次焼結体を熱間静水圧プレス処理する方法において、熱間静水圧プレス処理に供する一次焼結体の平均結晶粒径が1μm以下、相対密度が92%以上、結晶相が立方晶のみからなることを特徴とするジルコニア焼結体の製造方法。
- 一次焼結体が1200℃以上1300℃以下で5時間以上保持されたものであることを特徴とする請求項10に記載のジルコニア焼結体の製造方法。
- 一次焼結体が昇温速度500℃/時以上、焼結温度1350℃以上1500℃以下とし、焼結温度での保持をせずに焼結されたものであることを特徴とする請求項10に記載のジルコニア焼結体の製造方法。
- 熱間静水圧プレス処理を1250℃以上1600℃未満、50MPa以上で行うことを特徴とする請求項10に記載のジルコニア焼結体の製造方法。
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| US13/380,190 US8815760B2 (en) | 2009-08-07 | 2010-07-15 | Transparent zirconia sintered body, method for producing same, and use of same |
| CN201080035072.XA CN102471168B (zh) | 2009-08-07 | 2010-07-15 | 透明氧化锆烧结体、其生产方法及其用途 |
| KR1020177009333A KR101742762B1 (ko) | 2009-08-07 | 2010-07-15 | 투명 지르코니아 소결체, 그리고 그의 제조방법 |
| EP10806325.6A EP2463257B1 (en) | 2009-08-07 | 2010-07-15 | Transparent zirconia sintered body and method for producing same |
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| EP (1) | EP2463257B1 (ja) |
| JP (1) | JP5685846B2 (ja) |
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| EP3318218A1 (en) | 2016-11-07 | 2018-05-09 | Shofu Inc. | Dental zirconia blank having high relative density |
| KR20180051401A (ko) | 2016-11-07 | 2018-05-16 | 소후 인코포레이티드 | 높은 상대 밀도를 갖는 다층의 치과용 지르코니아 블랭크 |
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| US12115032B2 (en) | 2016-11-07 | 2024-10-15 | Shofu Inc. | Dental zirconia blank having high relative density |
| JP2021515754A (ja) * | 2018-02-28 | 2021-06-24 | スリーエム イノベイティブ プロパティズ カンパニー | ガラス粉末を含有する表面処理剤と組み合わせた多孔質ジルコニア物品を高速焼成するための部材のキット及び方法 |
| JP7407722B2 (ja) | 2018-02-28 | 2024-01-04 | スリーエム イノベイティブ プロパティズ カンパニー | ガラス粉末を含有する表面処理剤と組み合わせた多孔質ジルコニア物品を高速焼成するための部材のキット及び方法 |
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| Publication number | Publication date |
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| JP2011051881A (ja) | 2011-03-17 |
| US20120094823A1 (en) | 2012-04-19 |
| KR20170041921A (ko) | 2017-04-17 |
| CN102471168B (zh) | 2017-05-03 |
| JP5685846B2 (ja) | 2015-03-18 |
| EP2463257A4 (en) | 2013-04-10 |
| EP2463257B1 (en) | 2018-06-06 |
| KR20120054015A (ko) | 2012-05-29 |
| US8815760B2 (en) | 2014-08-26 |
| EP2463257A1 (en) | 2012-06-13 |
| CN102471168A (zh) | 2012-05-23 |
| KR101742762B1 (ko) | 2017-06-01 |
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