Antioxidative ZrB2-SiC-Y2O3 coating on surface of C-C composite material and preparation method thereof

Abstract

The invention discloses an antioxidative ZrB2-SiC-Y2O3 coating on the surface of a C-C composite material and a preparation method thereof. The preparation method comprises the following steps: preparing thermally-spraying spherical agglomerated powder by virtue of a spray granulation technology; and then preparing the ZrB2-SiC-Y2O3 multi-element composite coating by virtue of an atmospheric plasma spraying technology. According to the invention, the rare earth oxide Y2O3 is introduced into ZrB2-SiC ceramic powder, so the effects of enhancing ZrO2-phase stability and inhibiting phase change are achieved, and the oxidation ablation resistance of the coating can be improved. The ZrB2-SiC-Y2O3 composite coating is prepared by adopting the atmospheric plasma spraying technology, so thermal damage to a C / C composite material matrix is small, and the thickness of the coating is controllable. The coating system forms yttrium silicate with low oxygen diffusivity under the condition of oxidation at 1450 DEG C, can effectively inhibit the volatilization of a SiO2 glass phase, and has a certain self-healing effect.

Description

technical field [0001] The invention belongs to the field of surface technology, in particular to a C-C composite surface anti-oxidation ZrB 2 -SiC-Y 2 o 3 Coatings and methods for their preparation. Background technique [0002] C / C composite material has excellent characteristics such as low density, high strength and specific modulus, high thermal conductivity, good ablation resistance and friction and wear resistance, especially its high-temperature mechanical properties are excellent, and the strength increases with temperature (1000 ℃~2300℃), the unique property of not falling but increasing makes it have the incomparable advantages of other materials, and has been used as an ablation-resistant and thermal structural material for long-term use at high temperatures. However, these characteristics of C / C composites can only be maintained in an inert atmosphere. In the absence of effective protection measures, their oxidation and ablation resistance is poor, and they a...

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Problems solved by technology

[0004] CN103422046A discloses "a preparation method of zirconium diboride-silicon carbide high-temperature anti-oxidation coating", which uses ultra-low pressure plasma spraying technology to apply ZrB 2 - SiC coated powder sprayed onto the surface of the substrate to prepare ZrB 2 -SiC composite coating can avoid SiC volatilization to a certain extent and improve the oxidation resistance of the coating. 2 -SiC coating oxidation rate is too fast

Document 1 (Jiao Gengsheng, Lu Guofeng, Li Hejun. Surface Y of C / C-SiC composite materials 2 o 3 -ZrO 2 -Al 2 o 3 Preparation of coating by brushing method and its high temperature oxidation resistance [J].Material Protection. 2014,47(7):9-11.) discloses a preparation of Y by embedding method and brushing method 2 o 3 -ZrO 2 -Al 2 o 3 / SiC coating method, the coating is oxidized at 1873K for 19 hours, and the weight loss rate is only 1.76%, which has good short-term high-temperature oxidation resistance, but the coating prepared by the brush coating method has low bonding strength, poor compactness, and uniformity Difficult to control, unable to achieve effective protection of C / C composite materials

Literature 2 "Ablation resistance of APS sprayed Mullite / ZrB 2 -MoSi 2 coating for Carbon / Carbon composites. Han Wei, Liu Min, Deng Chunming, Liu Xuezhang, Zeng Dechang, Zhou Kesong. Rare Metal Materials and Engineering. 2018, 47(4): 1043-1048." published atmospheric plasma spraying technology in C / Preparation of mullite / ZrB on the surface of C composites 2 -MoSi 2 Anti-ablation coating, the prepared double-layer coating forms silicate glass during the ablation process of oxypropylene, so it has excellent anti-ablation performance, but with the increase of heat flux, the chemical erosion and mechanical erosion are intensified, and the glass phase is gradually consumed leading to coating failure

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