Effect of titanium silicide content on the reinforcement of poly-crystalline cubic boron nitride composites sintered via the HPHT method
Source abstract
Abstract
In this paper, PcBN composites with high strength and high thermal stability were prepared by high temperature and high pressure sintering at 5.5 GPa and 1450 °C using Al-TiSi 2 as binder. The effects of TiSi 2 content on the phase composition, microstructure, mechanical properties, and thermal stability of PcBN composites were investigated. The results indicate that the density of the composites increases with an increase in the TiSi 2 content. The mechanical properties of the composites were found to be the best at 25 wt% TiSi 2 , where the hardness was 3475 HV, and the bending strength was 782.7 MPa. Furthermore, the PcBN composites exhibited good thermal stability in the temperature range of 400 °C–1200 °C due to the presence of the reaction product Si and partially oxidized SiO 2 , which prevented oxidation.
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