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Study of high-pressure sintering behavior of cBN composites starting with cBN–Al mixtures

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Abstract

Cubic boron nitride (cBN) composites starting with cBN–Al mixtures were sintered on WC-16 wt% Co substrates under static high pressure of 5.0 GPa and at temperatures of 800–1400 °C for 30 min. Vickers hardness of the sintered samples increased with increasing cBN content, and the highest hardness of 32.7 GPa was achieved for the cBN–5 wt% Al specimens sintered at 1400 °C. The reactions between cBN and Al started to occur at about 900 °C, and the reaction products strongly depended on the Al content, sintering temperature, and Co diffusion from the substrates according to the x-ray diffraction (XRD) observations. The high pressure and high temperature in situ resistance measurement indicated that the reactions between cBN and Al could be completed in about 90 s when the temperature was higher than ∼1200 °C at high pressure. The cBN composite sintered at 1200 °C from a cBN–15 wt% Al mixture showed the best cutting performance.

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Authors and Affiliations

  1. Institute of Atomic and Molecular Physics, Sichuan University, Chengdu, 610065, People’s Republic of China

    Yongjun Li, Sicheng Li, Ran Lv, Jiaqian Qin, Jian Zhang, Jianghua Wang, Fulong Wang, Zili Kou & Duanwei He

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  1. Yongjun Li
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  2. Sicheng Li
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  3. Ran Lv
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  4. Jiaqian Qin
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  5. Jian Zhang
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  6. Jianghua Wang
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  7. Fulong Wang
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  8. Zili Kou
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  9. Duanwei He
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Correspondence to Zili Kou.

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Li, Y., Li, S., Lv, R. et al. Study of high-pressure sintering behavior of cBN composites starting with cBN–Al mixtures. Journal of Materials Research 23, 2366–2372 (2008). https://doi.org/10.1557/jmr.2008.0316

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  • DOI: https://doi.org/10.1557/jmr.2008.0316

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