Influence of Technological Conditions on the Properties of PcBN Composites Fabricated by Spark Plasma Sintering

Abstract:

Polycrystalline cubic boron nitride (PcBN) composites were fabricated by spark plasma sintering (SPS). The SiC, Si₃N₄ and Si/B were used as binder. The effects of SPS sintering process parameters, such as the sintering temperature, holding time, heating rate and binder composition, on the properties of PcBN samples were investigated. PcBN composite with a hardness of 23.12GPa was fabricated efficiently by SPS. The hardness of PcBN sample increased first and then decreased with the increase of sintering temperature. As the holding time was 20 min, the hardness of PcBN sample was the highest. The PcBN performance at the heating rate of 50 °C/min was significantly better than that of 100°C /min. When the binder component of SiC, Si₃N_4, and Si was 63%:27%:10%, the hardness of PcBN was the highest. With an addition of Si, the PcBN samples had higher hardness than that of B.

• Periodical: Solid State Phenomena (Volume 281)
• Pages: 420-425
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.281.420
• Online since: August 2018
• Authors: Y.P. Ding, Ming Xuan Zhang, Qun Luo, Chen Jiang Dong, Jiao Jiao Yao, Yan Wang, Ka Gao, Rui Zhang*
• Keywords: Mechanical Properties, PcBN, Spark Plasma Sintering

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