Effect of Nb Additions on the Microstructure and Magnetic Properties of the Cermet
Ti(C,N)-based cermet has a series of advantages,such as high hardness,good corrosion resistance and low density,and have a wide application prospect in the industrial field.However,Ti(C,N)-based cermet is easy to be ferromagnetic at room temperature,which hinders its further popularization and application.In this paper,a series of TiC-10TiN-xNb-30Ni-4C(mole fraction)cermet materials were prepared by powder metallurgy.The magnetic properties,mechanical performance,and microstructure of metal ceramics were investigated using X-ray diffractometry(XRD),scanning electron microscopy(SEM),vibrating sample magnetometry(VSM),a physical properties testing system(PPMS),rockwell hardness tester,and a universal testing machine.The study examined the effects of varying Nb additions on these properties.The results indicate that all cermet materials consist of ceramic grains and a Ni-based binder phase,and the added Nb component is basically completely dissolved in binder phase and ceramic phase during sintering.On the whole,the ceramic grains become finer with the increase of Nb addition.The cermet materials without Nb show typical ferromagnetism,and when the amount of Nb is 8％(mole fraction),the cermet materials turn into paramagnetism.The increases in Nb content also led to a trend in which the flexural strength and hardness of Ti(C,N)-based cermet materials initially increased and then gradually decreased.The bending strength and hardness of Ti(C,N)-based cermet materials exhibit an initial increase followed by a gradual decrease with the rise in Nb content.When the content of Nb is 4％(mole fraction),Ti(C,N)-based cermets have good bending strength(1 470 MPa)and hardness(87.0 HRA).The research in this paper may offer a theoretical foundation for the fabrication of non-magnetic cermet materials.
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