Meiling Liu , Yajing Cao , Jiaying Feng , Wanxiu Hai , Yuhong Chen , Chengshang Zhou
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Effect of Nb on microstructure and tribological properties of Ti(C, N)-based cermet
The Ti(C,N)-based cermet were prepared by pressureless vacuum sintering using (Ti,W0.15,NbX)C pre-solid solution powder, and the effect of Nb molar ratio on microstructure, core/rim interface, mechanical and tribological properties were investigated. The results showed that increasing of Nb content led to distinct microstructural changes in the cermets. The gray core/Gy rim and white core/Gy rim microstructure enhanced mechanical properties, while the rimless black grains and gray core/black rim had a weakening effect. The cermet with (Ti,W0.15,Nb0.01)C had a Vickers hardness of 1664 MPa, fracture toughness of 10.3 MPa·m1/2 and transverse rupture strength of 1204 MPa. The average friction coefficient and the volume wear ratio at room temperature were 0.46 and 2.49E-8 mm3*N−1*m−1, respectively, with adhesive wear as the primary mechanism. At 600 °C, the average friction coefficient and the volume wear ratio were 0.37 and 1.15E-6 mm3*N−1*m−1, respectively, with tribo-oxidation being the dominant wear mechanism.
期刊介绍：
The International Journal of Refractory Metals and Hard Materials (IJRMHM) publishes original research articles concerned with all aspects of refractory metals and hard materials. Refractory metals are defined as metals with melting points higher than 1800 °C. These are tungsten, molybdenum, chromium, tantalum, niobium, hafnium, and rhenium, as well as many compounds and alloys based thereupon. Hard materials that are included in the scope of this journal are defined as materials with hardness values higher than 1000 kg/mm2, primarily intended for applications as manufacturing tools or wear resistant components in mechanical systems. Thus they encompass carbides, nitrides and borides of metals, and related compounds. A special focus of this journal is put on the family of hardmetals, which is also known as cemented tungsten carbide, and cermets which are based on titanium carbide and carbonitrides with or without a metal binder. Ceramics and superhard materials including diamond and cubic boron nitride may also be accepted provided the subject material is presented as hard materials as defined above.
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