摘要:
采用反应热压烧结法制备了SiC/Ti3SiC2复合材料, 研究了热压温度、 SiC含量及粒度对SiC/Ti3SiC2复合材料相组成、 力学性能以及应力-应变行为的影响。结果表明: 热压温度影响SiC/Ti3SiC2复合材料相组成; 随着热压温度的提高, 复合材料的弯曲强度和断裂韧性提高; 随SiC含量的增加, SiC/Ti3SiC2复合材料弯曲强度和断裂韧性提高, 当SiC的质量分数为30%时, 弯曲强度为371 MPa, 断裂韧性为6.9 MPa·m1/2; 但SiC的质量分数达到50%时, 由于复合材料含有较多的孔洞, 使强度和断裂韧性降低; 随着SiC 粒度的增大, 复合材料易于致密化, 使其弯曲强度和断裂韧性提高; SiC/Ti3SiC2复合材料在常温下表现为非脆性断裂。
Abstract:
SiC/Ti3SiC2 composites were prepared by reactive hot pressing method. The effects of hot pressing temperature, the content and particle size of SiC on the phase constituent, mechanical properties and the behavior of stress-strain of the composites were investigated. The results show that the hot pressing temperature influences the phase constituent of SiC/Ti3SiC2 composites. The flexural strength and fracture toughness of composites increase with the increase of hot pressing temperature. With the increasing the SiC content, the flexural strength and fracture toughness of composites increase. When the mass fraction of SiC is 30%, the flexural strength and fracture toughness of SiC/Ti3SiC2 composite are 371 MPa and 6.9 MPa·m1/2 , respectively. However, when the mass fraction of SiC content reaches 50%, the flexural strength and fracture toughness of composites decrease due to high porosity in the composites. The flexural strength and fracture toughness of composites increase with the particle size of SiC. SiC/Ti3SiC2 composites are non-brittle at room temperature.
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