Abstract
In this paper, polycrystalline cubic boron nitride (PCBN) was prepared under a high temperature and an ultra-high pressure. The influence of different sintering temperature on composition, microstructure, porosity and mechanical properties of the PCBN were investigated by means of X-ray diffraction (XRD), field emission scanning electron microscopy (SEM) and universal mechanical testing machine. The results showed that the main phase were identified as cBN, α-Si3N4, β-Si3N4, TiN and TiB2. The cBN grains connect with each other by the reaction product. As the sintering temperature increases, the hardness of the sample increased, and its bending strength increase first and then decrease. When the sintering temperature was 1600°C, PCBN presented the best comprehensive performance, the hardness and bending strength were 32.2 GPa and 1022.5 MPa, respectively.
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This study was financially supported by the Innovation-driven Development Special Fund Project of Guangxi Province, China (AA17204098).
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Mo Peicheng, Chao, C., Chuan, C. et al. Effect of Temperature on Sintering of PCBN with Ti, Si3N4, AlN, Y2O3 Additives. J. Superhard Mater. 43, 166–174 (2021). https://doi.org/10.3103/S1063457621030084
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DOI: https://doi.org/10.3103/S1063457621030084