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首页> 外文期刊>Silicates Industriels: Ceramic Science and Technology >Development of microstructure in mullite coatings for protection of ceramic-ceramic composites
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Development of microstructure in mullite coatings for protection of ceramic-ceramic composites

机译：用于保护陶瓷-陶瓷复合材料的莫来石涂层微观结构的发展

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摘要

The objective of this study is the development of mullite coatings produced by Atmospheric Plasma Spraying (APS) and High Velocity Oxi-fuel (HVOF) spraying for protection of SiC/SiC composites. An investigation of the key factors affecting theoxidation resistance of these coatings (coating microstructure and phase stability) is reported in this paper. Detailed characterisation of the coatings by SEM, TEM, XRD and EDS has revealed that the presence of an amorphous phase and silicon-richprecipitates, which tended to crystallise upon a thermal treatment in continuous air flow at 1200℃, was detrimental for their high temperature stability. Reactions between the protective silica scale and the mullite coating layer were particularlyobserved in coatings applied to SiC monoliths by APS subject to similar thermal treatments. Coatings produced by HVOF with a reduced fraction of amorphous phase were more chemically stable than similar APS coatings. The control of the microstructure ofHVOF coatings completely eliminating the formation of this amorphous phase by depositing fully crystallised mullite layers was considered the key issue to address to improve the thermal stability of mullite coated SiC samples.
机译：这项研究的目的是开发用于保护SiC / SiC复合材料的大气等离子喷涂（APS）和高速无氧燃料（HVOF）喷涂生产的莫来石涂层。本文报道了影响这些涂层抗氧化性的关键因素（涂层的微观结构和相稳定性）的研究。通过SEM，TEM，XRD和EDS对涂层的详细表征表明，存在非晶相和富含硅的沉淀物，这些沉淀物在1200℃的连续气流中进行热处理后易于结晶，因此不利于其高温稳定性。 。在经过相似热处理的APS应用于SiC整料的涂料中，特别观察到了保护性氧化硅鳞片和莫来石涂层之间的反应。由HVOF生产的具有减少的无定形相含量的涂层比类似的APS涂层在化学上更稳定。通过沉积完全结晶的莫来石层来控制HVOF涂层的微观结构，从而完全消除该非晶相的形成被认为是解决提高莫来石涂层SiC样品的热稳定性的关键问题。

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