Effect and mechanism of sintering pressure on microstructure and property of solid PCBN tools

DENG Wenli; DENG Fuming; XU Zhihao; HE Xuehua; ZHANG Peng; MA Xiangdong; CHENG Shaohua

doi:10.13394/j.cnki.jgszz.2018.5.0008

Volume 38 Issue 5

Oct. 2018

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Article Navigation > Diamond & Abrasives Engineering > 2018 > 38(5): 39-43

DENG Wenli, DENG Fuming, XU Zhihao, HE Xuehua, ZHANG Peng, MA Xiangdong, CHENG Shaohua. Effect and mechanism of sintering pressure on microstructure and property of solid PCBN tools[J]. Diamond & Abrasives Engineering, 2018, 38(5): 39-43. doi: 10.13394/j.cnki.jgszz.2018.5.0008

Citation:

DENG Wenli, DENG Fuming, XU Zhihao, HE Xuehua, ZHANG Peng, MA Xiangdong, CHENG Shaohua. Effect and mechanism of sintering pressure on microstructure and property of solid PCBN tools[J]. Diamond & Abrasives Engineering, 2018, 38(5): 39-43. doi: 10.13394/j.cnki.jgszz.2018.5.0008

Citation:

DENG Wenli, DENG Fuming, XU Zhihao, HE Xuehua, ZHANG Peng, MA Xiangdong, CHENG Shaohua. Effect and mechanism of sintering pressure on microstructure and property of solid PCBN tools[J]. Diamond & Abrasives Engineering, 2018, 38(5): 39-43. doi: 10.13394/j.cnki.jgszz.2018.5.0008

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Effect and mechanism of sintering pressure on microstructure and property of solid PCBN tools

doi: 10.13394/j.cnki.jgszz.2018.5.0008

DENG Wenli^1,2,
DENG Fuming^{1,2
,
,},
XU Zhihao^1,2,
HE Xuehua^1,2,
ZHANG Peng^1,2,
MA Xiangdong^1,2,
CHENG Shaohua^2,3

1. Institute of Super-hard Cutting Tool Materials, China University of Mining and Technology(Beijing), Beijing 100083, China;
2. Research Center of High Pressure Materials, China University of Mining and Technology(Beijing), Beijing 100083, China;
3. Dongguan Shuanghua Electronics Co., Ltd., Dongguan 523320, Guangdong, China

More Information

Rev Recd Date: 2018-11-12

Available Online: 2022-07-10

Abstract

Abstract

The whole polycrystalline cubic boron nitride (PCBN) tools were prepared by high temperature and high pressure sintering with size 5 μm CBN and binder Al powders on the domestic cubic press.The optimum sintering parameters were obtained by testing and analyzing the wear ratio and microhardness of samples. The sintering pressure was 5.4 GPa, the sintering temperature was 1500℃ and the sintering time was 240 s with hardness of 3897HV5 (loading time 15 s). The microhardness of the sample are HV3897, and the wear ratio was 8750. SEM, TEM observation and XRD analysis show that increasing of sintering pressure can make CBN particles produce a certain plastic flow, and inhibit the surface of CBN particles to reverse into hBN during sintering process. The binder Al can react with the surface of CBN particles to form the intermediate products AlN and AlB₂, which can form a solid ceramic bond between CBN grains and eliminate the residual hBN during sintering, thus improving the performance of the integral PCBN tool.
- polycrystalline cubic boron nitride,
- integral PCBN tool,
- high pressure sintering,
- hexagonalization,
- microstructure