Material for thermal barrier coating

A heat-insulating coating and base material technology, applied in coating, metal material coating process, air transportation, etc., can solve problems such as residual tensile stress

Inactive Publication Date: 2006-04-26
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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Experimental program
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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;

[0052] 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)

[0053] First, the inventors studied the thermal expansion coefficient α and thermal conductivity λ estimated from the crystal structure...

Embodiment 2

[0067] 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.

[0068] 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.

[0069] 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

[0082] Although MG 2 SiO 4 In electrical equipment such as IC substrates and components, the electrical equipment is used as an insulating material, but is not used in an example of a high temperature structural material represented by a heat insulating coating. The inventors focus on MG 2 SiO 4 The high thermal expansion and low thermal conductivity are taken into account the application of the heat insulating coating, first for MG 2 SiO 4 And its similar compound was studied.

[0083] Mg 2 SiO 4 The mineral name is magnesium olivine, belongs to the oblique crystal, and has the PMNB according to the spatial group. 2 SiO 4 (M olivine-type structure of the M is a ferrous metal element). It belongs to this raw square crystal, has a spatial group PMNB classification to M 2 SiO 4 (M2-valent metal elements) of olivine-shaped structures and Fe 2 SiO 4 (Mineral iron olivine), MN 2 SiO 4 (Mineral named olivine), Ni 2 SiO 4 (Mineral nickel olivine), CO 2 SiO 4 Wait.

[0084] The talent met...

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Abstract

The invention provides a novel thermal insulation coating material with no phase transfer problem, a melting point higher than the working temperature range, a thermal conductivity lower than that of zirconia, and a thermal expansion rate higher than that of zirconia. The thermal barrier coating material has an orthorhombic or monoclinic crystal structure derived from perovskite (for example, a platy perovskite structure represented by the composition formula A2B2O7), or a c-axis/a-axis ratio of 3 or more The composition of the tetragonal layered structure (such as K2NiF4 structure and Sr3Ti2O7 structure, Sr4Ti3O10 structure), and the composition represented by the composition formula LaTaO4, and the composition with the composition formula M2SiO4 or (MM') 2SiO4 (wherein M, M 'is a divalent metal element) composition of the olivine structure represented as the main body.

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 Applications(China)
IPC IPC(8): C04B35/01C23C4/11
CPCY02T50/60
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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