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采用渗硅反应烧结工艺制备了SiC/B4C复合材料,并研究了碳含量对复合材料的力学性能及微观结构的影响。结果表明,SiC/B4C复合材料的力学性能(硬度、抗弯强度、韧性)随着碳含量的增加呈先增强后减弱的趋势。在碳含量为10vol%的条件下,复合材料的综合性能最佳,其硬度、抗弯强度和韧性分别为19.63 Gpa、358 MPa和3.96 MPa?m1/2。此外,当碳含量不足10vol%,复合材料的组织随碳含量增加均匀性提高;当碳含量超过10vol%,显微组织均匀性变差,并且添加碳粉后,复合材料由沿晶、穿晶混合断裂向穿晶断裂转变,最终导致SiC/B4C复合材料力学性能的改变。
The SiC / B4C composites were prepared by infiltration sintering reaction and the effect of carbon content on the mechanical properties and microstructure of the composites was investigated. The results show that the mechanical properties (hardness, flexural strength, toughness) of SiC / B4C composites first increase and then decrease with the increase of carbon content. Under the condition of carbon content of 10vol%, the composite has the best comprehensive properties, its hardness, flexural strength and toughness are 19.63 Gpa, 358 MPa and 3.96 MPa? M1 / 2, respectively. In addition, when the carbon content is less than 10vol%, the microstructure of the composites increases with the increase of the carbon content. When the carbon content exceeds 10vol%, the microstructure homogeneity deteriorates. When the carbon powder is added, The transition from mixed fracture to transgranular fracture ultimately leads to the change of mechanical properties of SiC / B4C composite.