Ti(Cx,N1-x)基金属陶瓷是用不同碳氮比制造的.研究了碳/氮比对芯-环结构和金属陶瓷性能的影响.结果 表明,由于孔太多,Ti(C0.5,N0.5)基金属陶瓷的性能较差.随着碳/氮比的增加,白核/灰环的形成率降低,并且微观结构的均匀性增强.因此,基于Ti(C0.7,N0.3)的金属陶瓷显示出优异的力学性能,但有少量的孔隙和较低的相对密度.与Ti(C0.7,N0.3)基金属陶瓷相比,TiC基金属陶瓷在没有N元素的情况下具有较高的相对密度且无孔隙,但其晶粒较粗大.为了获得细晶粒和高密度的显微组织,将0.25％Cr3C2-0.75％VC(质量分数)引入到TiC基金属陶瓷中,获得了优异的硬度、横向断裂强度和韧性.另外,在Ti(C0.7,N0.3)基金属陶瓷中也添加了0.25％Cr3C2-0.75％VC,但其力学性能低于Ti(C0.7,N0.3)的金属陶瓷,这是因为细颗粒和反应颗粒与Ti(C,N)发生了急性固溶反应.研究了基于不同C/N比的Ti(Cx,N1-x)基金属陶瓷的切削性能和摩擦性能.结果 表明,具有0.25％Cr2C3-0.75％VC的TiC基金属陶瓷在室温下的摩擦系数最低,为0.15,在1000r/min的高速切削过程中,使用寿命最长.“,”Ti(Cx,N1-x)-based cermets are fabricated with different ratios of carbon to nitrogen.The effect of C/N ratio on the core-rim structures and properties of cermets was studied.The results indicate that Ti(C0.5,N0.5)-based cermets possess poor properties due to too many pores.With the increase of C/N ratio,the formaation rate of white-core/gray-rims decreases,and the homogeneity of the microstructure is enhanced.Consequently,the Ti(C0.7,N0.3)-based cermets show excellent mechanical properties,but a spot of voids and low relative density.TiC-based cermets with excellent relative density and non-porosity can be achieved in the absence of N element,which have coarser grain compared with Ti(C0.7,N0.3)-based cermets.In order to achieve fine grains and high density microstructure,0.25wt％Cr3C2-0.75wt％VC is introduced into the TiC-based cermets.Superior hardness,transverse rupture strength and toughness are achieved.In addition,0.25wt％ Cr3C2-0.75wt％ VC is also added into the Ti(C0.7,N0.3)-based cermets,but its mechanical properties are lower than that of the Ti(C0.7,N0.3)-based cermets without 0.25wt％Cr3C2-0.75wt％VC addition,which is due to acute solid solution reaction of finer and reactive particles with Ti(C,N).The cutting and friction performances of Ti(Cx,N1-x)-based cermets with different C/N ratios were also investigated.The results show that the TiC-based cermets with 0.25wt％Cr3C2-0.75wt％VC exhibit the lowest coefficient of friction which is 0.15 at the room temperature,and the longest service life during high speed cutting at 1000 r/min.