| TiN represented transition metal carbides and nitrides are attractive materials for engineering applications because of the exceptional physical and chemical properties. But at the same time, the atomic diffusion ability is weak, these materials also exist poor toughness and hard to sintering. This topic selection of stoichiometric ratio TiN0.3 as raw material instead of measurement than TiN, the use of high concentrations of N atoms in the TiN0.3 space to reduce the sintering temperature of sintering materials, In addition, a large number of N atom space can promote between different atomic diffusion migration to speed up the sintering. At the same time, this study also found that by Ti N0.3 mole ratio, such as a variety of transition metal carbide composite sintering method, single crystal structure of single-phase covalent compounds can be obtained, and can improve the sintering of materials and the performance of the sintered body.Test process is mainly divided into two parts: The first is TiN0.3 with NbC layering and compound sintering. The test results show that the diffusion phenomena for Ti, C, N and Nb atoms are very obvious at the sintering interfaces of NbC and Ti N0.3. TiN0.3 and NbC in different temperature, different ratio of raw material conditions for sintering, phase and microstructure of sintered body, Vickers hardness and fracture toughness analysis, finally found that the sintering temperature is 1600 ℃, NbC content is 20 vol. %, samples of the best comprehensive performance.TiN0.3 and strong covalent bonding transition metal carbides can proceed by the effects of highly N-deficient structure and temperature. Solid solution between TiN0.3 and VC, NbC, Mo2 C, TaC and WC powder mixture nonmetal atom diffusion through the space, the radius of the larger spread between atoms to replace each other way, can react on different levels after sintering to form uniform fcc structured respectively. |
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