层状C/ZrB_2-SiC复合材料素坯成型工艺的研究  

Study on Biscuit Forming Process of Laminated C/ZrB_2-SiC Composites

作　　者：魏春城[1] 叶长收 孟凡涛[1] 张泳昌[1] 

机构地区：[1]山东理工大学材料科学与工程学院,淄博255049

出　　处：《人工晶体学报》2015年第2期493-496,502,共5页Journal of Synthetic Crystals

基　　金：山东省自然科学基金(ZR2012EMM016)

摘　　要：采用两种不同素坯成型工艺制备层状C/Zr B2-Si C复合材料,并对其微观结构和力学性能进行研究。结果表明:高温下预压成型制备的层状Zr B2-Si C复合材料层厚均匀,界面平直,弯曲强度和断裂韧性较高,分别达到427MPa和11.3 MPa·m1/2。而室温下预压成型各层厚度不均,界面弯曲,出现界面交叉现象,弯曲强度和断裂韧性较低,分别为277 MPa和9.4 MPa·m1/2。采用素坯高温预压成型制备的层状C/Zr B2-Si C复合材料力学性能较高,主要归因于界面平直,裂纹交替通过基体层和界面层,裂纹的扩展路径变长,断裂功增加。Laminated C/ZrB_2-SiC composites were prepared by two different biscuit forming process. The microstructures and mechanical properties of the composites at room temperature were investigated. The results indicate that the composite prepared by pre-press forming under high temperature exhibit uniform layer thickness, fiat interface, higher flexural strength and fracture toughness （427 MPa and 11.3 MPa · m ^1/2 respectively ）. The flexural strength and fracture toughness of laminated C/ZrB_2-SiC composite m , prepared by pre-press forming at room temperature was only 277 MPa and 9.4 MPa ·m^1/2, which is much lower than the former. Owing to uniform layer thickness, main crack deflection, and the increase of crack propagation, the composites prepared by warm compaction represent higher mechanical properties.

关 键 词：预压成型 C/ZrB:一SiC 力学性能 弯曲强度 断裂韧性 

分 类 号：TQ174.12[化学工程—陶瓷工业]