Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8948463 | Ceramics International | 2018 | 10 Pages |
Abstract
TiC0.7N0.3-HfC cermet tool materials were fabricated by hot-press sintering. Effects of different metal additives (Ni, Co, Ni-Co and Ni-Mo), sintering temperature and holding time on the microstructures and mechanical properties of TiC0.7N0.3-HfC cermets were investigated. Results showed that Ni-Mo or Ni-Co as metal additives was better for the mechanical properties of TiC0.7N0.3-HfC cermets than only Ni or only Co as the metal additives and Ni-Mo better than Ni-Co. HfC particle dispersion existed in these four cermets and only in the TiC0.7N0.3-HfC-Ni-Mo cermet the core-rim structure obviously existed. TiC0.7N0.3-HfC-Ni-Mo cermet had significantly smaller grains than the other three cermets because Ni-Mo can significantly refine the grain. With the sintering temperature increasing from 1450â¯Â°C to 1650â¯Â°C, grains grew gradually; Vickers hardness and flexural strength decreased gradually and the fracture toughness increased firstly and then decreased. With the holding time increasing from 15â¯min to 60â¯min, grains grew gradually; Vickers hardness, flexural strength and the fracture toughness increased firstly and then decreased. TiC0.7N0.3-HfC-Ni-Mo cermets sintered at 1450â¯Â°C with 30â¯min holding time had the better comprehensive mechanical properties with flexural strength of 1346.41â¯Â±â¯31â¯MPa, fracture toughness of 8.46â¯Â±â¯0.23â¯MPaâ¯m1/2 and Vickers hardness of 22.91â¯Â±â¯0.22â¯GPa.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Jiaojiao Gao, Jinpeng Song, Ming Lv, Lei Cao, Juncai Xie,