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

Published online by Cambridge University Press:  31 January 2011

Yongjun Li ,
Sicheng Li ,
Ran Lv ,
Jiaqian Qin ,
Jian Zhang ,
Jianghua Wang ,
Fulong Wang ,
Zili Kou  and
Duanwei He
Yongjun Li
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Sicheng Li
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Ran Lv
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Jiaqian Qin
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Jian Zhang
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Jianghua Wang
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Fulong Wang
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Zili Kou*
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
Duanwei He
Affiliation:
Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: kouzili@cddmd.com
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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.

Keywords

Sintering
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 9 , September 2008 , pp. 2366 - 2372
Copyright
Copyright © Materials Research Society 2008

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