Mechanical Properties and Microstructure of Self-Lubricating Ceramic Cutting Tool Materials
Al2O3/TiC ceramic tool materials with the addition of solid lubricants such as BN and CaF2 were produced by hot pressing. Effect of the solid lubricants on the microstructure and mechanical properties has been studied. Results showed that AlN phase resulted from the reaction of Al2O3 with BN was formed in Al2O3/TiC/BN composite after sintering. Significant micro-cracks resulted from the residual stress owing to the difference in the thermal expansion coefficient were found on the polished surface, and caused large mechanical properties degradation. While Al2O3/TiC/CaF2 composite showed higher flexural strength, fracture toughness, and hardness compared with that of Al2O3/TiC/BN composite owing its porosity absent and finer microstructure.
Xing Ai, Jianfeng Li and Chuanzhen Huang
J. X. Deng et al., "Mechanical Properties and Microstructure of Self-Lubricating Ceramic Cutting Tool Materials", Materials Science Forum, Vols. 471-472, pp. 221-224, 2004