采用添加剂热压烧结制备了短纤维增韧氮化硅基复合材料,并对材料的力学性能和微观结构进行了分析和讨论.结果表明:Y_2O_3-La_2O_3添加剂促进了α-Si_3N_4→β-Si_3N_4的相转变,这个体系经过1800 ℃的热压烧结后,其中的碳纤维产生退化.而经过1600 ℃热压烧结的含LiF-MgO-SiO_2添加剂的体系中,纤维保持完好,晶粒没有发生相转变.两个体系的复合材料的断裂韧性值均高于氮化硅基体的值,其提高幅度均接近20%,这归因于纤维拉拔、裂纹偏转和界面松解机制.
Ceramic matrix composites were prepared by hot pressing with Si_3N_4 powder, short carbon fiber and sintering additives. Their microstructure and mechanical properties were studied and discussed. La_2O_3-Y_2O_3 additives play a positive role in the transformation of α to a phase. And the degradation of carbon fiber occurs after sintering at 1800 ℃. After sintering at 1600 ℃, the phase transformation does not be detected. And the carbon fibers still keep their nature morphology in the LiF-MgO-SiO_2 system. The ceramic matrix composites have the maximum value of the fracture toughness approximately by 20% higher than that of the monolithic silicon nitride in the two systems, which attribute to different toughness mechanisms: fiber pullout, flaw deflection and interfacial debonding.
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