反应熔体浸渗法制备C/SiC复合材料的结构与力学性能

采用反应熔体浸渗法制备了二维碳/碳化硅陶瓷基复合材料,并对材料的结构和力学性能进行了研究.研究表明,复合材料致密度很高,密度为2.31g/cm3,开气孔率为1.39%;垂直和平行碳布方向的压缩强度高且差别很小,分别为417.55MPa和409.28MPa,材料的压缩破坏主要由基体的压剪组合破坏情况决定,表现为剪切型破坏形式;材料的层间剪切强度高,数值为43.15MPa,明显高于采用CVI工艺制备的同类复合材料的强度值29.10MPa,层间剪切破坏主要由碳布层间基体的剪切破坏情况决定.

STRUCTURE AND MECHANICAL PROPERTIES OF C/SIC COMPOSITES BY REACTIVE MELT INFILTRATION

Continuous carbon fiber reinforced silicon carbide composites with two d imension are fabricated by reactive melt infiltration. The structure and mechanical properties are investigated. The results show that the com- posites are extraord inarily dense, with density 2.31g/cm3and open porosity 1.39%. The compressive stresses verti- cal and parallel to layer are almost the same, and the values are 417.55MPa and 409.28MPa respectively. The damage and failure behavior is mainly determ ined by the failure mode ofmatrix, and the materials undergo brittle failure. Comparing the interlam inar shear strength ofmaterials fabricated by reactive melt infiltration and chem ical vapor infiltration, the former ( 43.15MPa) is higher than the latter ( 29.10MPa), and the damage behavior is mainly determ ined by failure mode ofmatrix between layers.