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An anti-sintering dual-mode composite structure thermal barrier coating and its preparation process

A technology of thermal barrier coating and composite structure, which is applied in the coating process of metal materials, coating, superimposed layer plating, etc., can solve the problems of coating peeling failure, strain tolerance reduction, etc., and achieve anti-sintering and long life , Feasibility, and rapid realization of the effect of engineering application

Active Publication Date: 2020-05-22
咸阳瞪羚谷新材料科技有限公司
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The increase in elastic modulus directly leads to a sharp decrease in strain tolerance, which leads to peeling failure of the coating during service

Method used

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  • An anti-sintering dual-mode composite structure thermal barrier coating and its preparation process
  • An anti-sintering dual-mode composite structure thermal barrier coating and its preparation process
  • An anti-sintering dual-mode composite structure thermal barrier coating and its preparation process

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Embodiment Construction

[0036] The following are specific examples given by the inventors. It should be noted that these examples are preferred examples of the present invention for those skilled in the art to understand the present invention, but the present invention is not limited to these examples.

[0037] A preparation process of an anti-sintering dual-mode composite structure thermal barrier coating, comprising the following steps:

[0038] First, a metal bonding layer 2 with a thickness of 100 μm was prepared on the surface of a cylindrical superalloy substrate 1 (φ25.4mm×3mm) by an air-assisted supersonic flame spraying (HVAF) process;

[0039] Subsequently, the thermal barrier coating was prepared by atmospheric plasma spraying: (i) 8YSZ spherical hollow spray powder with a particle size of 40 μm to 70 μm was used to prepare a coating with a thickness of 50 μm and an interlayer bonding rate of 30%. The size is 8-15μm, the thickness is 0.8-1.5μm; the spraying power is 42kW, the main gas argo...

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Abstract

The invention discloses an anti-sintering dual-mode complex structure thermal barrier coating layer and a preparation process thereof. The preparation process comprises the following steps: Step I, depositing a metal on a matrix to form a metal adhesive layer; Step II, alternating layering and depositing thermal barrier coating layer powder and phase-change shrinkable ceramic material powder on the metal adhesive layer to form a composite lamellar structure thermal barrier coating layer; Step III, forming a plurality of longitudinal pores in the composite lamellar structure thermal barrier coating layer through strong flow impact cooling pretreatment process to obtain a dual-mode complex structure thermal barrier coating layer; Step IV, generating phase-change shrinkage through a second lamella unit in a thermal treatment or actual application process of the dual-mode complex structure thermal barrier coating layer and the matrix, so as to obtain the anti-sintering dual-mode complex structure thermal barrier coating layer. The structure of the anti-sintering dual-mode complex structure thermal barrier coating layer spontaneously forms a plurality of pores perpendicular to a heat flow direction when serving in a high temperature environment, maintains a high strain tolerance and has the characteristics of sintering resistance and long service life.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a thermal barrier coating and a preparation process thereof. Background technique [0002] Thermal barrier coatings (TBC) are widely used in high-temperature hot-end components of aero-engines and gas turbines. Under the current technical conditions, a TBC with a thickness of 250 μm or more can reduce the surface temperature of the blade substrate by 50 °C or even more than 100 °C, which is equivalent to the progress made in increasing the service temperature of superalloys after 30 years of hard work. Therefore, as a heat-insulating ceramic coating, the application of TBC is of great significance for increasing the gas inlet temperature, thereby improving the thrust-to-weight ratio and efficiency of the engine. [0003] Thermal barrier coatings prepared by thermal spraying have been widely used because of their low cost and excellent comprehensive performance. Thermal sprayed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/00C23C4/11C23C4/06C23C4/129C23C4/134C23C4/18
CPCC23C4/06C23C4/11C23C4/129C23C4/134C23C4/18C23C28/32C23C28/3455
Inventor 杨冠军李广荣刘梅军唐春华刘宏李成新李长久
Owner 咸阳瞪羚谷新材料科技有限公司
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