生坯制备参数对反应烧结碳化硅显微组织与性能的影响

Effects of Green Processing Parameters on Microstructure and Properties of Reaction-Bonded Silicon Carbide

研究了反应烧结碳化硅陶瓷的显微组织和性能与生坯碳含量、成型压力以及碳粉粒度的关系。结果表明：生坯成型压力与生坯含碳量存在最佳匹配，否则，陶瓷性能随之降低；对于一定粒度的碳化硅粉而言，加入到生坯中碳粉粒度应小于一定尺寸，否则，陶瓷的断裂强度和密度将随碳粉粒度的增大而降低。

The effects of carbon content, moulding pressure, and carbon particle size of green body on microstructure and properties of reaction-bonded silicon carbide (RBSC) have been investigated. The experimental results show that moulding pressure should match the carbon content of green body, or else, the properties of RBSC decrease. For the green body containing a certain size of SiC powders, the carbon particle should be less than a certain size, or else, the density and fracture strength of RBSC decrease with increasing carbon particle size.