Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7989528 | International Journal of Refractory Metals and Hard Materials | 2018 | 6 Pages |
Abstract
The CaF2@Al2O3 coated powder with shell-core structure was prepared by liquid-phase non-uniform nucleation method. Based on the successful preparation of Al(OH)3 coated CaF2 powder, Al2O3/TiC self-lubricating tool was prepared by wet dispersion mixing and vacuum hot pressing sintering process. The microstructure and performance of the self-lubricating ceramic tool with different volume content of CaF2@Al(OH)3 coated powders were investigated. The results show that when the CaF2@Al2O3 content is 10â¯vol%, the comprehensive mechanical properties of Al2O3/TiC/CaF2@Al2O3 tool materials is the best, the hardness is 16.86â¯GPa, the flexural strength is 662â¯MPa, and the fracture toughness is 6.34â¯MPa·m1/2. Compared with the traditional Al2O3/TiC/10â¯vol%CaF2 self-lubricating ceramic cutting tools, Al2O3/TiC/10â¯vol% CaF2@Al2O3 ceramics in flexural strength, fracture toughness and hardness were increased 19.06%, 36.9%, 12.25%, of which the most obvious increase in fracture toughness.
Keywords
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Zhaoqiang Chen, Lianggang Ji, Niansheng Guo, Runxin Guo,