The Development Of Al₂O₃-TiB₂/Al₂O₃-Tic Biomimetic Laminated Ceramic Cutting Tools And Its Cutting Performance Study

Al₂O₃Ceramic cutting tools have high hardness, excellent wear resistance,good thermal stability, and good machinability, and many other advantages,the rawmaterial to make ceramic cutting tools is low price and rich source,so it will has awide range of application prospects in the cutting tool field. But its large brittleness,lower strength, and welding difficulty limiting its scope of application, Especially forpure alumina ceramic cutting tool,so it not widely used, Thus toughening of ceramiccutting tools has been the research emphasis and difficulty of ceramic cutting toolindustry.The way by adding various carbide（such as TiC,SiC,WC） in ceramic materialsto particle dispersion toughening, after hot pressing sintering,it can be enhancedstrength and toughness. But this way to its performance improvement is limited, doesnot meet the requirements of modern cutting technology. This paper introduces theideas of the biomimetic laminated to the development of ceramic cutting tool design,successful create Al₂O₃-TiB₂/Al₂O₃-TiC biomimetic laminated composite ceramiccutting tools, and the mechanical properties, microstructure and cutting performancehave be research.TiC and TiB₂and Al₂O₃has a good chemical compatibility, and there was solittle difference between their thermal expansion coefficient. But TiB₂has a highercoefficient of thermal conductivity and hardness than TiC, so this article throughbiomimetic laminated design,useing Al₂O₃/TiB₂as surface,and Al₂O₃/TiC as anintermediary, by adjusting the TiB₂and TiC in different ratio of Al₂O₃,and thethickness of each layer are different, make the Al₂O₃ceramic cutting tool surface hasresidual compressive stress, and to improve its performance. Based on the ratio of rawmaterial, extrusion process, and different layer thickness ratio and the thickness ofeach layer three aspects to design and improvement the mechanical properties ofAl₂O₃-TiB₂/Al₂O₃-TiC ceramic cutting tools.Cutting performance of the biomimetic laminated composite ceramic cuttingtools were compared with the ordinary ceramic cutting tool when cutting45#hardenedsteel,and biomimetic laminated ceramic tool wear performance were analyzed. Experiments show that: The biomimetic laminated ceramic cutting tool abrasionresistance, impact resistant performance is superior to the ordinary ceramic cuttingtools.