【摘要】 采用真空烧结工艺制备了Ti(C,N)基金属陶瓷,研究了烧结温度和保温时间对Ti(C,N)基金属陶瓷显微组织和力学性能的影响,并用SEM观察其断口形貌。结果表明:随着烧结温度的升高,金属陶瓷的组织逐渐变得均匀,硬质颗粒逐渐球化,且其环形相逐渐变得完整;温度过高,保温时间过长,晶粒都会明显长大,环形相变厚,导致材料性能下降。经1440℃烧结,保温60min,可获得较佳的性能,其抗弯强度达1914.2MPa,硬度HRA达90.1。更多还原

【Abstract】 Ti(C,N)-based cermets were produced by vacuum sintering.The effect of sintering temperature and holding time on the microstructure and mechanical properties of Ti(C,N)-based cermets was studied,and the fracture morphology was investigated by scanning electron microscope.The results show that,with the increasing of the sintering temperature,the microstructure of cermets became uniformity,and the ceramic grains got rounded,and the rim phase structure was completeness gradually.When the sintering temperature was too high or the holding time was too long,the rim phase was modified thicken,and the growing phenomenon of grains was abvious,the properties was decreased.The cermets sintered at 1440℃ for 60min showed the best mechanical properties.Their transverse rupture strength reached 1914.2MPa,and the hardness reached 90.1.更多还原