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中文摘要：
以双峰碳化硅粉末、碳黑、短碳纤维为原料，采用注浆成型、反应烧结法制备了力学性能优异的碳化硅复合材料。研究了硅化反应对碳纤维表面形貌及组分的影响。结果表明：硅化反应在碳纤维表面生成致密B-sic层，反应过程伴随的体积膨胀增加了纤维表面的粗糙度。混合酸HN03＋HF腐蚀实验表明纤维表面由直径2～5μm的p-SiC晶粒构成。提出了硅化纤维的双层结构模型：外层由微米、亚微米尺度卢SiC晶粒构成，内层由si—c基团组成的混合物组成。碳短纤维体积分数为30％时，复合材料的弯曲强度、断裂韧性分别达到最大值416MPa、5．1MPa．mo05，相比单一反应烧结碳化硅陶瓷分别提高102％、78％。
英文摘要：
A reaction bonded silicon carbide ceramic was prepared via slip casting and reactive sintering with bimodal silicon carbide powders, carbon and short carbon fiber as raw materials. The effect of siliconization reaction on the fiber morphology and constitute was investigated. The result shows that a dense SiC layer with micron- and submicron-sized particles is formed on the fiber surface. Since the volume expands during sintering, the fiber surface becomes rougher, which can favor the growth of SiC particles. From the results of HF-HNO3 acid corrosion, the fiber surface is constructed by t-SiC particles, and a bilayer structure model was proposed for the siliconized fiber with outer layer of micron- and submicron-sized particles of β-SIC and inner layer of SiC clusters. For the specimen with fiber fraction of 30%（in volume）, the flexural strength and fracture toughness reach the maximum values of 416 MPa and 5.1 MPa.m0.5, which are increased by 102% and 78%, respectively, compared to the monolithic reaction bonded silicon carbide ceramics.
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