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Synthesis and Performance Study of Polycrystalline Cubic Boron Nitride Using WC–B4C–Al2O3 as a Binder

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Abstract

Using WC–B4C–Al2O3 as a binder, polycrystalline cubic boron nitride (PCBN) composite materials were synthesized under high temperature and ultra-high pressure conditions. X-ray diffraction (XRD) and scanning electron microscope (SEM) was used to analyze the phase composition and microstructure of the composite material. At the same time, the porosity, microhardness, flexural strength, and abrasion ratio of the composite material were tested. The research results show that at ultra-high pressure (6 GPa) and temperature between 1250 and 1550°C, the phase components in PCBN are mainly composed of BN, WB2, WB, and Al2O3. During low-temperature sintering, the internal structure of the sample is loose, with holes and gaps, resulting in poor compactness, low bending strength, and low microhardness. With the increase of temperature, the compactness, flexural strength, and microhardness of PCBN are obviously enhanced. When the sintering temperature is 1550°C, the comprehensive mechanical properties of PCBN are the best, with microhardness of 38.6 GPa, flexural strength of 789.6 MPa, and wear ratio of 9371.

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Funding

This work was supported by the Innovation-Oriented Special Development Fund Project of Guangxi Province, China (AA17204098) and the Large Special Project of Guilin, Guangxi, China (20190204-1).

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Authors and Affiliations

  1. Guilin Tebon Superhard Material Co., Ltd., 541004, Guilin, Guangxi, P.R. China

    Mo Peicheng, Chen Jiarong, Chen Chao, Zhang Yanjun, Luo Ying, Wang Wenlong, Pan **aoyi & Zhang Zhe

  2. Guangxi Key Laboratory of Superhard Material, China Nonferrous Metal (Guilin) Geology and Mining Co., Ltd, 541004, Guilin, Guangxi, P.R. China

    Mo Peicheng, Chen Jiarong, Chen Chao, Zhang Yanjun, Luo Ying, Wang Wenlong, Pan **aoyi & Zhang Zhe

  3. National Engineering Research Center for Special Mineral Material, China Nonferrous Metal (Guilin) Geology and Mining Co., Ltd., 541004, Guilin, Guangxi, P.R. China

    Mo Peicheng, Chen Jiarong, Chen Chao, Zhang Yanjun, Luo Ying, Wang Wenlong, Pan **aoyi & Zhang Zhe

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  1. Mo Peicheng
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  2. Chen Jiarong
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  7. Pan **aoyi
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  8. Zhang Zhe
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Correspondence to Mo Peicheng.

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Mo Peicheng, Jiarong, C., Chao, C. et al. Synthesis and Performance Study of Polycrystalline Cubic Boron Nitride Using WC–B4C–Al2O3 as a Binder. J. Superhard Mater. 44, 252–258 (2022). https://doi.org/10.3103/S1063457622040062

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