Nano zirconium oxide based wearable sealing composite coating material and preparation method thereof

Abstract

The invention discloses a nanometer zirconia abrasion sealing composite paint material, which comprises the following parts: base-phase material, filling material A, filling material B, adhesive and water, wherein the base-phase material is 70-75% in the base-phase material, filling material A and filling material B; the filling material A is 14-20% in the base-phase material, filling material A and filling material B; the filling material B is 9-15% in the base-phase material, filling material A and filling material B; the adhesive is 2-5.5% in the base-phase material, filling material A andfilling material B; the water is 70-78% in the base-phase material, filling material A, filling material B and adhesive.

Description

technical field [0001] The invention relates to an abradable sealing coating material and a preparation method thereof, in particular to a high-temperature nano zirconia-based abradable sealing composite coating material for plasma spraying and a preparation method of the composite coating material. Background technique [0002] The rapid development of the aviation industry has put forward higher and higher requirements for aero-engines. Large thrust, high work efficiency, and low fuel consumption have become the overall goals of engine design and manufacture. To achieve this goal, the improvement of the engine's own working performance It must become a part of the research work, but judging from the current research results in this area, the effect is not very obvious, because the work of the engine is related to the external conditions, so people began to seek ways to improve the performance of the engine as a whole Through the research, it is found that the use of gas pa...

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Problems solved by technology

[0007] The sealing coating with the above-mentioned properties can have a good sealing effect on the gas path, greatly improve the working efficiency of the aircraft engine, and prolong the service life. Foreign research on abradable sealing coatings has started to compare As early as, there are more than 20 kinds of abradable sealing coating powders suitable for engine sealing. The sealing coating materials used in the early development mainly include NiAl, Al-Si, NiCrAl, NiCrAlY powders, which belong to The alloy coating has a temperature resistance of 650°C and has a high bonding strength with the substrate, but its wearability is poor. When it is used at high temperature, it is prone to melting and sticking to the blade, and the coating will fail due to thermal deformation, and it is very wearable to the blade. Large. Then, in order to solve the problem of the adhesion between the blade and the coating and the high hardness of the coating, the working performance of the coating is improved by adding a soft phase to the coating, and these soft phases form a dispersion in the base phase material distribution, reduce the hardness of the coating, improve the wearability of the coating, and prevent the adhesion of the coating to the blade. The materials used at this time include Ni-graphite, Al-Si-polyester, NiCrAl-boron nitride, etc. These materials The temperature resistance can reach up to 800°C, among which boron nitride, graphite, polyester, diatomaceous earth, bentonite, etc. can play a lubricating role to varying degrees as the soft phase, and the coating has a certain porosity, which is good for heat resistance. It is superior to the previously used alloy coating in terms of performance and thermal shock resistance, but the bonding strength and air erosion resistance of this coating are not ideal. With the development of the engine, the working temperature has reached more than 1000 ° C, Previous coatings can only withstand temperatures up to 800°C, so the demand for high-temperature coatings arises.

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