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以Ti C、Ti N微米级粉末为主要原料,Ni、Co为金属粘结剂,添加改性短碳纤维(Cf)为增强相,采用无压结技术制备了Ti(C,N)基金属陶瓷,利用扫描电镜分析了Ti(C,N)基金属陶瓷的显微组织、断口形貌,通过维氏硬度法、三点弯曲法测试了Ti(C,N)基金属陶瓷的硬度和抗弯强度。结果表明:碳纤维表面镀镍后,镍磷(Ni-P)镀层表面平整致密,均匀包覆于碳纤维表面,且镀层与纤维结合紧密;添加改性碳纤维后,Ti(C,N)基金属陶瓷断裂方式以穿晶断裂为主,断面整体起伏较大,断口形貌主要表现为大量穿晶断裂留下的大块硬质相颗粒,少量沿晶断裂留下的凹坑以及小块硬质相颗粒和粘结相金属塑性变形形成的撕裂棱;Ti(C,N)基金属陶瓷组织形貌具有典型的“芯-壳”组织结构;当碳纤维添加量为4wt%时,材料抗弯强度和硬度达到最大值,分别为386.42、33.96 GPa。
Ti (C, N) -based cermets were prepared by non-pressure-bonded technique with Ti C and Ti N micron powders as the main raw material, Ni and Co as metal binders and modified short carbon fibers (Cf) The microstructure and fracture morphology of Ti (C, N) -based cermets were analyzed by scanning electron microscopy. The hardness and bending resistance of Ti (C, N) -based cermets were measured by Vickers hardness method and three-point bending method strength. The results show that the surface of Ni-P coating is even and densely coated on the surface of carbon fiber, and the coating and the fiber are tightly bonded. After the modified carbon fiber is added, the surface of Ti (C, N) -based cermet The fracture mode mainly consists of transgranular fracture with a large fluctuation of the whole section. The fracture morphology is mainly characterized by a large amount of massive hard phase particles left by a large number of transgranular fractures, a few pits left by intergranular fracture, and small hard phases Ti (C, N) -based cermets have a typical “core-shell” structure. When the carbon fiber content is 4wt%, the material resistance Bending strength and hardness reached the maximum, respectively 386.42,33.96 GPa.