Biaxial drawing test piece for testing strength of thermal barrier coating

Abstract

The invention discloses a biaxial drawing test piece for testing the strength of a thermal barrier coating. The biaxial drawing test piece comprises a metal drawing substrate and a substrate surface coating which is painted on the surface of the metal drawing substrate, wherein the metal drawing substrate is designed into a test specimen with biaxial drawing characteristics and is provided with a clamping handle which can be clamped by a biaxial drawing machine in two orthogonal directions; the clamping handle and a main body of the test piece are provided with a smooth transition area; four symmetrical round holes are formed in the middle of the metal drawing substrate; and the center of the test piece serves as a symmetry axis of the substrate surface coating, and the substrate surface coating is symmetrically distributed in the area among the four symmetrical round holes. By the design of the biaxial drawing test piece, the state of complex strain which is born by a coating system in a service environment can be effectively simulated, and the foundation is provided for fully and accurately acquiring strength parameters of the coating system.

Description

technical field [0001] The invention relates to the technical field of testing the strength of a thermal barrier coating material, in particular to a biaxial tensile test piece for testing the strength of a thermal barrier coating. Background technique [0002] Thermal barrier coating technology is a very important thermal protection technology. It is mainly sprayed on the surface of metal substrates, which has a good thermal insulation and protection effect on metal substrates. It has a wide range of applications on hot end parts of gas turbines and aero-engines. application. The use of thermal barrier coating technology can significantly reduce the service temperature of the metal substrate, enabling the hot end components to operate at a gas temperature higher than its melting point, which is of great practical significance for improving gas efficiency and saving energy. Due to the complex multi-layer structure of the system and the brutal high-temperature service enviro...

AI Technical Summary

Problems solved by technology

In traditional strength tests, uniaxial tensile test specimens or three-point / four-point bending test specimens are mostly used, and these test specimens cannot simulate the complex stress state that the coating system is subjected to during actual service.

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