Anti-sintering dual-mode complex structure thermal barrier coating layer and preparation process thereof

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...

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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

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