碳化硅材料中游离硅及游离碳对性能的影响

研究了全碳粉反应渗硅碳化硅（PCRBSC）材料的结构与力学性能的关系。分析了渗硅碳化硅材料中游离硅（fsi)，游离碳（fc)含量对抗折强度的影响。结果表明：参硅碳化硅材料中随游离硅（fsi)含量的增加，其抗折强度下降，并且二者呈直线关系，符合线性复合规划，另一方面，游离碳（fc)含量较高的渗硅碳化硅材料，尽管游离硅（fsi)含量低，但其抗折强度低于等量或较多游离硅（fsi)含量的渗硅碳化硅材料的抗折强度。

The influence of free silicon and free carbon to Melt-infiltrated Silicon Carbide

The relation of structure and mechanical properties of pure carbon melt-infiltrated silicon carbide (PCRBSC)is investigated. The influence of the free silicon content and free carbon content on flexural strength is analysed. Experimental result shows that the flexural strength of melt-infiltrated silicon carbide decreases linearly with volume percent of free silicon content which obeys linear mixture rule. At higher free carbon content, the flexural strength of melt-infiltrated silicon carbide is lower than that of melt-infiltrated silicon carbide with equal or more free silicon even though there is no free silicon or rare free silicon content.