Research Status and Progress of Preparing Ti(C,N)Solid Solution Powder by Carbothermal Reduction Nitridation Method AITranslate

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Chinese Library Classification Number:TG148[金属学及工艺—金属材料]

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Ti(C,N)-based cermets have been considered as ideal materials to replace traditional WC-based cermets due to their abundant resources,low cost and excellent physical and chemical properties.However,their low fracture strength and toughness limit their application in high-speed cutting.This paper reviews the reaction mechanism and the influence of key process parameters of the carbon thermal reduction nitridation method for preparing Ti(C,N)solid solution powder,analyzes the shortcomings of the current Ti(C,N)powder preparation methods,and prospects the future research directions.The reaction process of preparing Ti(C,N)powder by carbothermal reduction nitridation method is divided into three stages:TiO₂ undergoes solid-solid reaction with C atoms to generate Ti₃O₅ intermediate phase,Ti₃O₅ intermediate phase undergoes gas-solid reaction with N₂ and CO to generate Ti(C_x,N_y,O_z),and the C,N and O atoms in Ti(C_x,N_y,O_z)undergo displacement reaction to obtain Ti(C,N)powder.Increasing the reaction temperature and prolonging the reaction time are beneficial for increasing the C content of Ti(C,N)powder,but increase its grain size,while carbon source with a small particle size and optimized nitrogen flow rate can improve the purity and performance of Ti(C,N)powder.Although the carbothermal reduction nitridation method is considered as the dominant technology for preparing Ti(C,N)due to its low cost and easy industrialization,it still faces challenges such as low product purity and coarse grain size.Future research needs to focus on developing efficient and economical preparation processes,accurately regulating the particle size of Ti(C,N)solid solution powder and reducing agglomeration,so as to promote the industrial application of Ti(C,N)-based cermets.