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利用化学气相反应法对掺杂石墨材料进行了SiC梯度涂层,研究了SiC梯度涂层对掺杂石墨材料热力学性能以及微观结构的影响。获得了约100μm的SiC涂层,涂层后的材料导热性能下降,而机械强度有所增加。对涂层表面的物相成分分析表明,除了SiC之外,还有少量的单质Si。厚膜SiC梯度涂层的掺杂石墨材料在HT-7托卡马克装置中经等离子体放电实验后,SiC的颗粒形貌发生了明显的变化,涂层厚度下降到约30μm。

Effect of SiC gradient coating on the properties of doped graphite

Thick SiC gradient coating on the surface of the doped graphite was prepared by chemical vapor reaction. The effect of SiC gradient coating on the thermo-mechanical properties as well as microstructure of the doped graphite was investigated. Results showed that the thermal conductivity of the doped graphite decreased, while the mechanical strength increased when the SiC was coated on the surface of the doped graphite with a thickness about 100μm. Phase composition analysis revealed: there were strong SiC diffraction peaks and weak Si diffraction peak for the coatings. Grain size and structure of SiC was changed, and thickness of the SiC coating decreased from 100μm to 30μm after discharge experiments in HT-7 device during the autumn operating season of 2005.