Preparation and Properties of β-SiAlON-cBN Composites Using Y2O3, B2O3 and Al as Additives

Chao He; Xiao Fei Shi; Xin Yan Yue; Jiang Jun Wang; Hong Qiang Ru

doi:10.4028/www.scientific.net/KEM.602-603.380

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 602-603Preparation and Properties of β-SiAlON-cBN...

Preparation and Properties of β-SiAlON-cBN Composites Using Y₂O₃, B₂O₃ and Al as Additives

Abstract:

SiAlON-cBN composites with different contents of cBN were consolidated by spark plasma sintering (SPS) at 1450°C using Y₂O₃, B₂O₃ and Al as additives. The effect of cBN content on the density, phase compositions, microstructures and mechanical properties of β-SiAlON-cBN composites was investigated. With increasing the cBN content, the density and hardness of β-SiAlON-cBN composites decreased. Fracture toughness could increase thanks to the crack deflection resulted from the cBN particles. For β-SiAlON-10 wt% cBN composites, the optimum hardness and highest relative density were 13 GPa and 96.4 %, respectively. For β-SiAlON-40 wt% cBN composites, the highest fracture toughness was K_IC = 5.3 MPa∙m^1/2.

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Key Engineering Materials (Volumes 602-603)

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380-383

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https://doi.org/10.4028/www.scientific.net/KEM.602-603.380

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Online since:

March 2014

Authors:

Chao He, Xiao Fei Shi, Xin Yan Yue*, Jiang Jun Wang, Hong Qiang Ru

Keywords:

CBN, SPS, Β-Sialon

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* - Corresponding Author

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