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自蔓延高温合成C_f/TiC-TiB₂复合材料的力学性能研究

Study on Mechanical Properties of C_f/TiC-TiB₂ Composites Combustion-Synthesized by SHS

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【Author】 Wang Jianli1,Zhang Guangsheng1,Zhu Yunguang1,Zhang Xinghong2(1.Department of Mechanical Engineering,Anhui University of Science and Technology,Wuhu 241000,China)(2.Center for Composite Materials,Harbin Institute of Technology,Harbin 150080,China)

【机构】安徽工程科技学院机械工程系；哈尔滨工业大学复合材料与结构研究所安徽芜湖241000；安徽芜湖241000；黑龙江哈尔滨150080；

【摘要】为提高TiC-TiB2复合材料的强度和韧性以拓宽其应用,用自蔓延高温合成结合准热等静压(SHS/PHIP)的方法制备了碳纤维质量分数分别为0%,1%,3%,5%,7%的Cf/TiC-TiB2复合材料。通过实验测定,随碳纤维含量的增加,Cf/TiC-TiB2复合材料的弯曲强度和断裂韧性都呈现先增加后降低的趋势。当碳纤维含量达到3%时,强度和韧性分别为406.12MPa和6.26MPa.m1/2,均高于纯TiC-TiB2陶瓷。纤维的断裂、桥连和裂纹的偏转是复合材料的主要增韧机制。更多还原

【Abstract】 To improve strength and toughness of TiC-TiB2 composites and widen their applications,Cf/TiC-TiB2 ceramic composites containing 0wt%,1wt%,3wt%,5wt%,7wt% carbon fiber were fabricated respectively by Self-propagating High temperature Synthesis and Pseudo Heat Isostatic Press(SHS/PHIP).The results show that the bend strength and toughness of Cf/TiC-TiB2 ceramic composites increased first and then decreased later with increasing of the content of carbon fiber.When the content of carbon fiber was 3wt%,the bend strength and toughness of Cf/TiC-TiB2 ceramic composites reached 406.12 MPa 和 6.26 MPa.m1/2,respectively,which were higher than that of pure TiC-TiB2 composites.The main toughening mechanism was attributed to fracture and bridging of carbon fiber and crack deflexion.更多还原