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Material for thermal barrier coating

A technology of thermal insulation coating and coating film, which is applied in the direction of coating, metal material coating process, air transportation, etc., and can solve problems such as residual tensile stress

Inactive Publication Date: 2008-03-26
MITSUBISHI HEAVY IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But since La 2 Zr 2 o 7 The thermal expansion rate of zirconia is also smaller than that of zirconia, so the problem is that tensile stress may remain between metal parts as base materials in practical use

Method used

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Examples

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Embodiment 1

[0050] It is known that by changing the conditions for solving the basic equations of quantum mechanics, various physical property values ​​at the nanometer level can be obtained. This method is a non-empirical calculation method that does not use any test results as the calculation parameters and obtains the required data. It is called "first-principle calculation". In the present invention, this first-principle calculation is used to estimate the thermal expansion coefficient α and the thermal conductivity λ from the crystal structure.

[0051] (From; http: / / www.nistep.go.jp / achiev / ftx / jpn / stfc / stt009j / feature3.html#4-0 "Science and Technology Trends" December 2001, Science and Technology Trends Research Center, Science and Technology Policy Research Institute, Ministry of Education, Culture, Sports, Science and Technology of Japan)

[0052] First, the inventors studied the thermal expansion coefficient α and thermal conductivity λ estimated from the crystal structure based on t...

Embodiment 2

[0069] In this example, the composite of the materials whose thermal expansion coefficient and thermal conductivity were measured in the above-mentioned Example 1 was studied.

[0070] According to Example 1, La 2 Si 2 O 7 , La 2 Ti 2 O 7 , Sr 2 Ta 2 O 7 And LaTaO 4 Since its thermal expansion rate is lower than that of zirconia, tensile stress may be generated when it is used as a thermal insulation coating material. Therefore, in order to maintain the low thermal conductivity of these materials and increase the coefficient of thermal expansion, the combination of them with other high thermal expansion materials described in Table 1 has been studied.

[0071] When two types of ceramics with a large difference in thermal expansion coefficient are combined, the thermal expansion coefficient of the composite material (α c ) Is represented by the following equation (3) called Turner's equation. In formula (3), α is the thermal expansion rate, K is the bulk modulus of elasticity, V is...

Embodiment 3

[0084] Although Mg 2 SiO 4 It is used as an insulating material in electronic and electrical equipment such as IC substrates and components, but there are no examples of high-temperature structural materials represented by thermal insulation coatings. The inventors focused on Mg 2 SiO 4 With high thermal expansion and low thermal conductivity, considering the application in thermal insulation coating, first of all, Mg 2 SiO 4 And similar compounds were studied.

[0085] Mg 2 SiO 4 The mineral name of forsterite is forsterite, which is classified as M according to the space group Pmnb 2 SiO 4 (M is a divalent metal element) material with an olivine structure. Belongs to this kind of orthorhombic crystal, which has a classification of M according to the space group Pmnb 2 SiO 4 (M is a divalent metal element) The olivine type structure material also has Fe 2 SiO 4 (Mineral name iron olivine), Mn 2 SiO 4 (Mineral name manganese olivine), Ni 2 SiO 4 (Mineral name nickel olivine), Co 2...

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Abstract

The invention provides a novel thermal barrier coating material free from problems of the phase transition having a melting point higher than the temperature region for use, and having a thermal conductivity less than that of zirconia and a thermal expansion coefficient greater than that of zirconia. The thermal barrier coating material comprises a composition having an orthorhombic or monoclinic structure (for example, a tabular perovskite structure represented by the empirical formula: A2B2O7) derived from a perovskite structure or a tetragonal layer structure having a c axis / a axis ratio of 3 or more (for example, a K2NiF4 structure, a Sr3Ti2O7 structure and a Sr4Ti3O10 structure), a composition represented by the empirical formula: LaTaO4, or a composition having an olivine type structure represented by the empirical formula: M2SiO4 or (MM')2SiO4, wherein M and M' are divalent metal elements.

Description

Technical field [0001] The present invention relates to a heat-insulating coating material applicable to mechanical parts used in high-temperature environments such as rotor blades, stator blades, combustors, and jet engines of gas turbines for power generation. Background technique [0002] In order to improve the efficiency of gas turbines and jet engines, methods of increasing the temperature of their combustion gases are adopted. Therefore, in order to protect metal parts at high temperatures (for example, the blade surface temperature of a 1500°C gas turbine is about 1400°C), the surface of the part is covered with a thermal barrier coating (TBC). As the material of the thermal barrier coating, a low thermal conductivity ceramic represented by rare earth stabilized zirconia is used (for example, refer to JP-A 8-074505 and JP-A 10-183013). The above-mentioned thermal barrier coating is implemented by forming a metal bonding layer by reduced pressure plasma spraying or the lik...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/01C23C4/10C23C4/11
CPCY02T50/672Y02T50/67Y02T50/60
Inventor 秋山胜德永野一郎志田雅人太田悟志
Owner MITSUBISHI HEAVY IND LTD
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