JP2002275615A - Heat shielding film and method for depositing the heat shielding film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prepare a heat shielding film which shields a member such as a gas turbine blade a diesel engine combustion chamber used at a high temperature from heat, and a deposition method therefor. SOLUTION: The heat shielding film having high temperature resistance is applied to the surface of an object (base metal) 11 to be treated. The heat shielding film 12 is formed of a calcium titanate (CaTiO3 ) layer formed by a thermal spraying method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the formation of a thermal barrier coating for protecting a member used at a high temperature such as a gas turbine blade or a diesel engine combustion chamber from heat or preventing heat from escaping. About the method.

[0002]

BACKGROUND ART Conventional thermal barrier coatings include zirconia-based ceramics (particularly, yttria-stabilized zirconia (hereinafter "YSZ").
That. )) Is used. Although the above materials have low thermal conductivity and are excellent in heat shielding properties, the upper limit is about 800.
At a high temperature of about 1000 ° C. and higher than 1000 ° C., there is a problem that a phase transformation in which a crystal structure or the like changes occurs. As a result of this phase transformation, the coating undergoes a volume change, which tends to cause cracking and peeling of the coating,
There is a problem. Therefore, the life of the coating at a high temperature exceeding 1000 ° C. cannot be expected, and there is a problem that it is difficult to apply the coating at a high temperature to, for example, a gas turbine blade or a diesel engine combustion chamber.

In general, zirconia ceramics (Y
SZ) has a linear expansion coefficient of 10 × 10 ^-6/ K around
On the other hand, metals generally used as base materials
The coefficient of linear expansion of the material is 12-16 × 10^-6Around / K
You. Therefore, the linear expansion between the YSZ coating layer and the base material
The coefficient difference increases, and as a result,
The force also increases, causing cracking and peeling of the coating
Is difficult to expect and a long life is not expected
There is a title.

SUMMARY OF THE INVENTION In view of the above problems, the present invention is to protect a material constituting a member from heat or prevent the heat from escaping outside of a member used at a high temperature such as a gas turbine blade or a diesel engine combustion chamber. Apply to
An object of the present invention is to provide a method for forming a thermal barrier coating, which does not generate phase transformation even at high temperatures and has a high linear expansion coefficient.

[0005]

Means for Solving the Problems A first method for solving the above problems is described below.
Invention of the thermal barrier coating is a thermal barrier coating of high temperature resistant to be applied to the surface of the object, that said thermal barrier coating is calcium titanate (CaTiO ₃₎ layer formed by thermal spraying It is characterized by.

A second invention is characterized in that, in the first invention, yttria-stabilized zirconia (YSZ) is added to the calcium titanate layer.

In a third aspect based on the second aspect, the amount of the yttria-stabilized zirconia (YSZ) is 10%.
% By volume or less.

According to a fourth aspect of the present invention, there is provided a high-temperature-resistant thermal barrier coating applied to the surface of the workpiece, wherein the thermal barrier coating comprises a calcium titanate layer formed by a thermal spraying method. It is characterized by comprising a coating and a second coating made of a yttria-stabilized zirconia (YSZ) layer formed on the surface of the first coating by a thermal spraying method.

According to a fifth aspect of the present invention, there is provided a high-temperature resistant thermal barrier coating applied to the surface of the object to be processed, wherein the thermal barrier coating comprises a nickel oxide layer formed by a thermal spraying method. And a second coating comprising a calcium titanate layer formed on the surface of the first coating by a thermal spraying method.

According to a sixth aspect of the present invention, in any one of the first to fifth aspects, the spraying method is a plasma spraying method.

A seventh invention is characterized in that, in any one of the first to fifth inventions, the object to be processed is a gas turbine blade or a combustion chamber of an internal combustion engine.

An eighth invention of a method of forming a thermal barrier coating is a method of forming a thermal barrier coating in which a high temperature resistant thermal barrier coating is applied to the surface of an object to be processed. It is characterized in that a film of a calcium oxide (CaTiO ₃ ) layer is formed.

According to a ninth aspect, in the eighth aspect, when spraying calcium titanate on the surface of the object,
It is characterized by adding yttria-stabilized zirconia (YSZ).

In a tenth aspect based on the ninth aspect, the amount of the yttria-stabilized zirconia (YSZ) is one.
A method for forming a thermal barrier coating, wherein the content is 0% by volume or less.

The invention of an eleventh method for forming a thermal barrier coating is a method for forming a thermal barrier coating on a surface of an object to be processed, wherein the surface of the object is coated with a calcium titanate layer. After forming a first coating consisting of
Yttria stabilized zirconia (YSZ)
A second coating made of a thermal spraying method.

A twelfth invention for a method for forming a thermal barrier coating is a method for forming a thermal barrier coating on a surface of an object to be processed, wherein the surface of the workpiece is coated with a nickel oxide layer. After forming the first coating by thermal spraying, a second coating of a calcium titanate layer is formed on the surface of the first coating by thermal spraying.

According to a thirteenth aspect, in any one of the eighth to twelfth aspects, the thermal spraying method is a plasma thermal spraying method.

In a fourteenth aspect based on any one of the eighth to thirteenth aspects, the object is a gas turbine blade or a combustion chamber of an internal combustion engine.

A fifteenth invention of a gas turbine blade is characterized in that it is obtained by any one of the eighth to thirteenth methods for forming a thermal barrier coating.

A sixteenth invention for a combustion chamber of an internal combustion engine is an eighth invention.
13. The method according to any one of items 13 to 13, wherein the heat shielding film is formed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described, but the present invention is not limited thereto.

[First Embodiment] FIG. 1 is a schematic view of a thermal barrier coating according to the present embodiment. As shown in FIG.
The thermal barrier coating according to the present embodiment is a heat-treated material (base material) 1
1 is a high-temperature-resistant thermal barrier coating applied to the surface of the substrate 1, wherein the thermal barrier coating 12 is formed of a calcium titanate (CaTiO ₃ ) layer formed by a thermal spraying method. The coating material for forming the calcium titanate layer uses calcium titanate (chemical formula: CaTiO ₃ , hereinafter referred to as CaTiO ₃ ) which is a composite oxide of calcium and titanium, and a thermal barrier coating is formed by plasma spraying. It is.

The reason for using calcium titanate as the thermal spraying material is as follows. (1) Calcium titanate is stable up to its melting point of about 1910 ° C. and does not undergo phase transformation. (2) The coefficient of linear expansion of calcium titanate is 12.5 × 10
^-6 / K, and the linear expansion coefficient of the metal as a base material (1:12
(About 6 × 10 ⁻⁶ / K). Therefore, 1000 ° C
Even at the above high temperatures, a stable coating can be obtained,
In addition, the generated thermal stress can be reduced. That is, calcium titanate has good high-temperature stability,
Since the coefficient of linear expansion is relatively high and the thermal conductivity is low, 10
Even under a high temperature condition of 00 ° C. or higher, it is expected that the life of the coating is prolonged.

Here, the thermal spraying method for forming the coating film of the present invention may be any method as long as the thermal spraying material is sprayed on the surface of the base material to be processed, but the plasma spraying method is particularly preferred. .

The object to which the thermal barrier coating is applied is not particularly limited as long as it protects members and the like used at high temperatures from heat or prevents heat from escaping. It is used at around 1000 ° C. and is particularly suitable for use in heat insulation of a combustion chamber of a gas turbine blade or an internal combustion engine (particularly, a diesel engine, etc.) for achieving high efficiency.

Hereinafter, the effect of using calcium titanate in the present invention will be demonstrated by experiments.

Test Example 1 In Test Example 1, 1000 ° C.
In order to confirm that there was no volume change due to phase transformation even at a high temperature exceeding, the density change before and after the heat treatment was examined. The exam is
As a coating material, CaTiO ₃ as a coating material according to the present embodiment and YSZ as a coating material according to a conventional technique as a comparative example were used.
Each coating is made of general structural steel (JIS SS
400) A thickness of 1 on the plane of a plate [20 mm square x T5 mm]
mm was formed by plasma spraying. Prior to the plasma spraying, an Al layer was sprayed on the steel surface to a thickness of 0.5 mm. Since this is performed only with the coating material when heat-treating, first spray Al with a thickness of 0.5 mm,
CaTiO ₃ or YSZ is sprayed thereon.
Next, CaTiO ₃ or Y formed on the surface of the Al layer
The entire SZ layer is immersed in an aqueous NaOH solution. Thus, dissolving the Al layer was removed only CaTiO ₃ layer or YSZ layer. Heat treatment is performed by applying each coating material in an electric furnace for 1 hour.
The test was performed at 400 ° C. for 100 hours. The density was measured according to JIS C2141.

Each coating material was subjected to a heat cycle test to examine the durability of the coating. The heat cycle test piece is a Ni-base heat-resistant alloy round bar φ8mm × L150
to prepare a CaTiO ₃ layer or YSZ layer to a thickness of 0.6mm spraying each coating material in the range of mm middle 100mm of. These were placed in an electric furnace and maintained at 1000 ° C. for 1 hour, then removed from the furnace and air-cooled to near room temperature. The evaluation was made based on the number of cycles at which cracking and peeling occurred. The results are shown in Table 1.

[0029]

[Table 1]

As shown in Table 1, 1400 ° C., 10
CaTiO before and after 0 hour holding heat treatment _ThreeLayer or YSZ layer
3 shows the results of density change and heat cycle test. With density change
Is 5.25 for the conventional YSZ layer.
g / cm^ThreeTo 5.4 g / cm^ThreeAlthough it is changing
And the CaTiO of the present invention_ThreeThe layers are almost changing
Absent. From this result, CaTiO_ThreeThe coating cracks even at high temperatures
No volume change that would cause
You can see that there is.

[0031] In addition, even with respect to heat cycle resistance, CaTiO ₃
The coating shows about twice the heat cycle life of the YSZ coating, indicating that the durability can be improved.

[Second Embodiment] FIG. 2 is a schematic view of a thermal barrier coating according to the present embodiment. As shown in FIG.
The thermal barrier coating according to the present embodiment is a heat-treated material (base material) 1
1 is a high-temperature-resistant heat-shielding coating applied to the surface of the substrate 1. The heat-shielding coating 13 is obtained by adding yttria-stabilized zirconia (YSZ) to a calcium titanate (CaTiO ₃ ) layer formed by thermal spraying. It becomes. In the first embodiment, in order to form a stable thermal barrier coating even at 1000 ° C. or higher, CaTiO is used instead of YSZ.
₃ is used. Calcium titanate (CaTiO ₃ ) has a slightly higher thermal conductivity than YSZ.
Therefore, while keeping the thermal conductivity relatively low, and
If a coating that can be used even at a high temperature of 1000 ° C. or higher can be formed, a higher-performance coating can be obtained. Therefore,
A predetermined amount of YSZ was mixed with CaTiO ₃ as a coating material to form a stable thermal barrier film with lower thermal conductivity.

The mixing ratio is preferably set to 10% by volume or less as shown in Test Example 2 described later. In this embodiment, it is assumed that the thermal conductivity is low and YS
Although Z is exemplified, the present invention is not limited to this, and a known zirconia-based material having a low thermal conductivity can be used as appropriate.

Test Example 2 In this test example, in order to confirm that there was no volume change even at a high temperature exceeding 1000 ° C., 1
The change in coating density before and after heat treatment at 400 ° C. for 100 hours was examined. Calcium titanate (CaTi
Using a powder in which O ₃ ) and YSZ were previously mixed at a predetermined ratio, a mixed coating was formed by plasma spraying. The mixing ratio of YSZ was 2, 5, 1 or 2 by volume, respectively.
0, 15, and 20%.

The thickness of the formed film was 1 mm. Other experimental methods are the same as in Test Example 1.

Next, the thermal conductivity of each coating at the above mixing ratio was measured, and it was confirmed that the thermal conductivity was lower. Each coating is made of general structural steel (JIS SS
4001) A coating having a thickness of 1 mm was formed on a plane of a plate [φ10 mm × T5 mm] by plasma spraying. Prior to the plasma spraying, a 0.5 m thick Al layer was formed on the steel surface.
m was sprayed. Since this is performed only with the coating material when the heat treatment is performed, first, the thickness of Al is 0.5 mm.
CaTiO sprayed and blended with a certain amount of YSZ
₃ was sprayed and immersed in an aqueous NaOH solution to melt the Al layer, and only the YSZ-containing CaTiO ₃ layer was taken out. The measurement was in accordance with JIS C 2141.

Further, in order to examine the durability of the coating, each coating at the above mixing ratio was subjected to a heat cycle test. The heat cycle test method is the same as in Test Example 1. The results are shown in Table 1 described above.

As shown in Table 1, a coating having a YSZ mixing ratio of 10% by volume or less has a density change of 1% or less, while a coating having a YSZ mixing ratio of 15% by volume has a coating density of about 2.5%. % And a density change rate almost similar to that of the YSZ-only coating.

The thermal conductivity of the coating mixed with YSZ is lower than that of the coating of 100% CaTiO ₃ , and the thermal conductivity has been reduced.

As a result of the heat cycle test, the heat cycle life was gradually reduced when YSZ was mixed.
A coating with a mixing ratio of 10% by volume or less is a conventional YSZ
The durability of 1.8 times or more compared with the film can be maintained. When the mixing ratio was 15% by volume or 20% by volume, the durability was considerably reduced and became 1.5 times or less. From these results, YS
It can be seen that if the Z mixing ratio is 10% by volume or less, a stable thermal barrier coating with low thermal conductivity can be obtained.

[Third Embodiment] FIG. 3 is a schematic view of a thermal barrier coating according to the present embodiment. As shown in FIG.
The thermal barrier coating according to the present embodiment is a heat-treated material (base material) 1
1 is a first coating 21 comprising a calcium titanate layer formed by thermal spraying.
And a second coating 22 composed of a yttria-stabilized zirconia (YSZ) layer formed on the surface of the first coating 21 by a thermal spraying method.

When the environment in which the coating is used is 1000 ° C. or lower, YSZ does not undergo phase transformation, so that it is not necessary to consider the decrease in durability due to volume change. By the way, as described above, since YSZ has a large difference in linear expansion coefficient from the metal material serving as the base material, the generated thermal stress is large, and a long life cannot be expected.

Therefore, as shown in FIG. 3, as the undercoat of YSZ, a C.sub.
By using aTiO ₃ and reducing the thermal stress generated from the difference in linear expansion coefficient, the durability of the coating can be improved.

In the present embodiment, two layers are used. However, the present invention is not limited to this. For example, between the first coating 21 and the second coating 22, for example, the second embodiment may be used. It is also possible to form a three-layer structure by interposing a third coating made of a CaTiO ₃ layer mixed with YSZ as in the embodiment.

Test Example 3 As Test Example 3, an undercoat CaTiO ₃ layer having a thickness of 0.2 mm and a top coat YSZ layer were formed by plasma spraying with a thickness of 0.3 mm.
In order to examine this durability, it was subjected to a heat cycle test. The heat cycle test method was the same as that in Test Example 1 except that the holding temperature was 800 ° C. The YSZ single layer coating for comparison is the same as the comparative example used in Trial Example 1.

Table 2 shows the results of the heat cycle test of the two-layer coating (test piece) of the YSZ layer and the CaTiO ₃ layer and the YSZ single-layer coating (test piece).

[0047]

[Table 2]

As shown in Table 2, the two-layer coating showed about 1.7 times the heat cycle resistance, indicating that improvement in durability can be expected.

[Fourth Embodiment] FIG. 4 is a schematic view of a thermal barrier coating according to the present embodiment. As shown in FIG.
The thermal barrier coating according to the present embodiment is a heat-treated material (base material) 1
The first heat-insulating coating 30 formed on the surface of the first coating 31 comprises a first coating 31 made of a nickel oxide layer formed by a thermal spraying method.
And a second coating 32 of a calcium titanate layer formed on the surface of the coating 31 by thermal spraying.

In order to further enhance the heat shielding property of the thermal barrier coating, a method of increasing the thickness of the coating is conceivable. By the way, when the coating thickness is increased, the temperature difference between the coating surface and the interface between the base material and the coating increases, and the thermal stress increases, and the coating may be peeled off. ing.

As shown in FIG. 4, a first layer (hereinafter referred to as an undercoat) 31 on the base material side 11 is plasma-sprayed with 0.5 mm of NiO to form a second layer of CaT on the first layer 31.
Plasma sprayed with 0.5 mm of iO ₃ to make the total film thickness 1.0
mm to improve the heat insulation.

The reason for selecting this configuration is as follows. (1) The reason why NiO is used as the undercoat layer is that Ca
The thermal conductivity is about 5 times higher than that of TiO ₃ , but lower than that of the metal material. Further, the coefficient of linear expansion is about 14 × 10 ^-6
It is suitable as an undercoat because it is closer to a metal material than / K and CaTiO ₃ and is stable up to a melting point of about 1950 ° C. (2) The top coat of CaTiO ₃ is Ni
This is because the thermal conductivity is lower than that of O and the coefficient of linear expansion is lower. Therefore, it is stable even at a high temperature, and it is possible to further enhance the heat shielding property by making the film thicker than usual.

Test Example 4 In Test Example 4, heat was applied from the coating surface by a laser to measure the temperature of the base material in order to ascertain the degree of improvement in the heat shielding property by increasing the film thickness. The prepared test piece was a two-layer coating of the CaTiO layer and the NiO layer of this example (film thickness 1 mm, (test piece A) and a single coating of CaTiO ₃ (film thickness 0.66 m
m) (test piece No. B). Plasma spraying was performed on each of the Ni-based heat-resistant alloy plates 30 mm square x T5 mm. The coating surface was irradiated with heat by a laser so that the coating surface temperature was 800 and 1000 ° C. A hole having a depth of 4 mm was made from the back side at the center of the Ni-base heat-resistant alloy plate as the base material, a thermocouple was fixed in the hole, and the base material temperature was measured 1 mm below the interface between the coating and the base material. .

Table 3 shows that the CaTiO layer and Ni
Two-layer coating with O ₂ (film thickness 1 mm: test piece No.
A) and CaTiO ₃₁ layer coating (film thickness 0.5 m)
m: Table 3 shows the base material temperature during laser heating of test piece No. B).

[0055]

[Table 3]

As shown in Table 3, the thickness of the test piece A was larger than that of the test piece A, and the base material temperature could be kept low. This example shows that the effect of protecting the base material from heat is great.

The durability of the coating of this test example was
A thermal cycle test was performed to understand. I prepared
The test piece had the same thickness as 1 mm, and the CaT
iO _ThreeCoating of Coating Layer and NiO Layer (Specimen No.
a) and CaTiO_ThreeSingle layer coating (specimen No. b)
I prepared two.

The heat cycle test piece was a Ni-base heat-resistant alloy round bar φ8
Each coating material was sprayed and produced in a range of 100 mm in the center of mm × L150 mm. These were placed in an electric furnace and maintained at 1000 ° C. for 1 hour, then removed from the furnace and air-cooled to near room temperature. The evaluation was made based on the number of cycles at which cracking and peeling occurred. Table 4 shows the results of the heat cycle test.

[0059]

[Table 4]

As shown in Table 4, the test piece a of this test example showed about 1.8 times the heat cycle resistance of the test piece b. As a result, increasing the thickness of one layer has an adverse effect on durability, and the durability is improved by adopting a coating with a linear expansion coefficient close to that of the base metal as in this test example. It turns out that it can be done.

[0061]

As described above, according to the first aspect of the present invention, there is provided a high-temperature-resistant thermal barrier coating applied to the surface of an object to be processed, wherein the thermal barrier coating is formed by thermal spraying. 1000 ° C. because it is a calcium titanate (CaTiO ₃ ) layer
Even under the above high temperature conditions, the life of the coating can be prolonged.

According to the second aspect, in the first aspect, since the yttria-stabilized zirconia (YSZ) is added to the calcium titanate layer, a more stable and lower thermal conductivity than the first aspect is obtained. A thermal film can be formed.

According to the third aspect, in the second aspect, since the addition amount of the yttria-stabilized zirconia (YSZ) is 10% by volume or less, a stable thermal barrier coating having a low thermal conductivity can be obtained. it can.

According to the fourth aspect of the present invention, there is provided a high-temperature resistant thermal barrier coating applied to the surface of the object, wherein the thermal barrier coating comprises:
Since it is composed of a first coating composed of a calcium titanate layer formed by thermal spraying and a second coating composed of an yttria-stabilized zirconia (YSZ) layer formed on the surface of the first coating by thermal spraying, The thermal stress generated from the difference in linear expansion coefficient can be reduced, and the durability of the coating can be improved.

According to the fifth aspect of the present invention, there is provided a high-temperature resistant thermal barrier coating applied to the surface of the object, wherein the thermal barrier coating comprises:
Since the first coating composed of the nickel oxide layer formed by the thermal spraying method and the second coating composed of the calcium titanate layer formed on the surface of the first coating by the thermal spraying method, the heat shielding property is further improved. be able to.

According to the sixth aspect, in any one of the first to fifth aspects, since the thermal spraying method is a plasma spraying method, efficient thermal spraying becomes possible.

According to the seventh aspect, in the first aspect, the object to be processed is a gas turbine blade or a combustion chamber of an internal combustion engine, so that high efficiency can be achieved.

According to the invention of the eighth method for forming a thermal barrier coating,
This is a method for forming a thermal barrier coating in which a high-temperature resistant thermal barrier coating is applied to the surface of the object to be processed, wherein a calcium titanate (CaTiO ₃ ) layer is formed on the surface of the object by a thermal spraying method. The service life of the coating can be prolonged even under high temperature conditions of not less than ℃.

According to the ninth aspect, in the eighth aspect, yttria-stabilized zirconia (YSZ) is added when spraying calcium titanate on the surface of the object to be treated. Also, it is possible to form a stable thermal barrier film with low thermal conductivity.

According to the tenth aspect, in the ninth aspect, since the addition amount of the yttria-stabilized zirconia (YSZ) is 10% by volume or less, it is possible to obtain a stable thermal barrier coating with low thermal conductivity. it can.

According to an eleventh aspect of the invention, there is provided a method for forming a thermal barrier coating, comprising applying a high-temperature resistant thermal barrier coating on the surface of an object to be processed. After the first coating made of the calcium layer is formed by the thermal spraying method, the second coating made of yttria-stabilized zirconia (YSZ) is formed on the surface of the first coating by the thermal spraying method. Heat stress to be reduced, and the durability of the coating can be improved.

According to the twelfth invention of the method for forming a thermal barrier coating, there is provided a method for forming a thermal barrier coating in which a high-temperature resistant thermal barrier coating is applied to the surface of the object to be processed. After forming the first coating of the layer by the thermal spraying method, the second coating of the calcium titanate layer is formed on the surface of the first coating by the thermal spraying method, so that the heat shielding property can be further improved.

According to the thirteenth aspect, in any one of the eighth to twelfth aspects, since the thermal spraying method is a plasma spraying method, efficient thermal spraying is possible.

According to the fourteenth aspect, in the invention according to any one of the eighth to thirteenth aspects, since the object to be processed is a gas turbine blade or a combustion chamber of an internal combustion engine, high efficiency can be achieved. .

According to the fifteenth invention of the gas turbine blade,
Since it is obtained by any one of the eighth to thirteenth methods of forming a thermal barrier coating, high efficiency can be achieved.

According to the sixteenth aspect of the invention for the combustion chamber of an internal combustion engine, since it can be obtained by any one of the eighth to thirteenth methods of forming a thermal barrier coating, high efficiency can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic view of a thermal barrier coating according to a first embodiment.

FIG. 2 is a schematic diagram of a thermal barrier coating according to a second embodiment.

FIG. 3 is a schematic diagram of a thermal barrier coating according to a third embodiment.

FIG. 4 is a schematic diagram of a thermal barrier coating according to a fourth embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 workpiece (base material) 12 thermal barrier coating 13 thermal barrier coating 20 thermal barrier coating 21 first coating 22 second coating 30 thermal barrier coating 31 first coating 32 second coating

Claims (16)

[Claims] 1. A high-temperature-resistant thermal barrier coating applied to a surface of an object to be processed, wherein the thermal barrier coating is a calcium titanate (CaTiO ₃ ) layer formed by a thermal spraying method. Thermal barrier coating. 2. The thermal barrier coating according to claim 1, wherein yttria-stabilized zirconia (YSZ) is added to the calcium titanate layer. 3. The thermal barrier coating according to claim 2, wherein an addition amount of the yttria-stabilized zirconia (YSZ) is 10% by volume or less. 4. A high-temperature-resistant thermal barrier coating applied to the surface of the object, wherein the thermal barrier coating comprises a first coating comprising a calcium titanate layer formed by thermal spraying, Yttria-stabilized zirconia (Y) formed on the surface of
And a second coating comprising an SZ) layer. 5. A high-temperature resistant thermal barrier coating applied to a surface of an object, wherein the thermal barrier coating includes a first coating made of a nickel oxide layer formed by a thermal spraying method, And a second coating comprising a calcium titanate layer formed on the surface of the coating by a thermal spraying method. 6. The thermal barrier coating according to claim 1, wherein the thermal spraying method is a plasma thermal spraying method. 7. The thermal barrier coating according to claim 1, wherein the object is a gas turbine blade or a combustion chamber of an internal combustion engine. 8. A thermal barrier coating forming method of applying a high temperature resistant thermal barrier coating on the surface of the object, the surface of the object to be treated, by spraying method a film of calcium titanate (CaTiO ₃₎ layer A method of forming a thermal barrier coating, comprising: forming a thermal barrier coating; 9. The method for forming a thermal barrier coating according to claim 8, wherein yttria-stabilized zirconia (YSZ) is added when spraying calcium titanate on the surface of the object to be treated. 10. The method according to claim 9, wherein the amount of the yttria-stabilized zirconia (YSZ) is 10% by volume or less. 11. A method for forming a thermal barrier coating on a surface of an object to be processed, wherein a heat-resistant thermal barrier coating is provided on the surface of the object, wherein a first coating comprising a calcium titanate layer is formed on the surface of the object by thermal spraying. After the formation, a second film made of yttria-stabilized zirconia (YSZ) is formed on the surface of the first film.
A method for forming a thermal barrier coating, characterized by forming a coating by thermal spraying. 12. A method of forming a thermal barrier coating on a surface of an object to be processed, wherein a heat-resistant thermal barrier coating is formed on the surface of the object to be processed. Thereafter, a second coating of a calcium titanate layer is formed on the surface of the first coating by a thermal spraying method. 13. The method according to claim 8, wherein the thermal spraying method is a plasma thermal spraying method. 14. The method according to claim 8, wherein the object to be processed is a gas turbine blade or a combustion chamber of an internal combustion engine. 15. A gas turbine blade obtained by the method for forming a thermal barrier coating according to any one of claims 8 to 13. 16. A combustion chamber of an internal combustion engine obtained by the method for forming a thermal barrier coating according to claim 8. Description: