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- Title
High Pressure Sintering of B-C-N-Ti Quaternary Superhard Composites.
- Authors
HUANG Hongdong; YU Xiaohui; HE Duanwei
- Abstract
In this work, the B-C-N-Ti quaternary superhard composite was prepared by high pressure and high temperature sintering with diamond, cubic boron nitride (cBN) and titanium (Ti) as starting materials. The characterization results show that Ti reacts with diamond and cBN to form TiC0.7N0.3 and TiB2 under high pressure and high temperature, which acts as the binding additives for diamond and cBN grains. The addition of appropriate amount of Ti can effectively improve the toughness of the sintered composite specimen. The formation of TiC0.7N0.3 and TiB2 ceramics and cBN coated the diamond grains and greatly enhanced the oxidation ability. When the molar ratio of diamond, cBN and Ti is 2:1:0.10 and sintered at 12 GPa and 2 000 °C for 5 min, the specimen exhibits the best performance with Vickers hardness of (49.0±1.2) GPa, fracture toughness of (14.2±0.6) MPa·m1/2 and oxidation temperature of 921 °C under air condition.
- Subjects
TITANIUM composites; BORON nitride; VICKERS hardness; FRACTURE toughness; CERAMIC coating
- Publication
Chinese Journal of High Pressure Physics, 2024, Vol 38, Issue 4, p1
- ISSN
1000-5773
- Publication type
Article
- DOI
10.11858/gywlxb.20240769