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
CN1764613AInactive Publication Date: 2006-04-26MITSUBISHI HEAVY IND LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI HEAVY IND LTD
Publication Date
2006-04-26
Estimated Expiration
Not applicable · inactive patent

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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.
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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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