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Improved mechanical performance and wear resistance of Ti-coated cBN–WC–Ni composites

Published online by Cambridge University Press:  22 October 2019

Changchun Lv ,
Xiaoyong Ren ,
Chengbiao Wang  and
Zhijian Peng Open the ORCID record for Zhijian Peng [Opens in a new window]
Changchun Lv
Affiliation:
School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China; and School of Science, China University of Geosciences, Beijing 100083, People’s Republic of China
Xiaoyong Ren*
Affiliation:
School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China; and School of Science, China University of Geosciences, Beijing 100083, People’s Republic of China
Chengbiao Wang
Affiliation:
School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China
Zhijian Peng*
Affiliation:
School of Engineering and Technology, China University of Geosciences, Beijing 100083, People’s Republic of China; and School of Science, China University of Geosciences, Beijing 100083, People’s Republic of China
*
a)Address all correspondence to these authors. e-mail: 675452385@qq.com
b)e-mail: pengzhijian@cugb.edu.cn
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Abstract

Composites of 0–20 vol% Ti-coated cBN (cBN@Ti) particles dispersed in WC–Ni were densified by spark plasma sintering under 50 MPa at 1300 °C. The cBN particles were distributed homogeneously with a Ti-rich interfacial layer between the cBN particles and WC–Ni matrix. Increasing cBN@Ti to 20 vol% decreased the sample densification, but all the composites were still >97.5% dense. The Vickers hardness and flexural strength initially increased and then decreased, reaching the maximum values of 1820 HV10 with 15 vol% cBN@Ti and 1500 MPa with 5 vol% cBN@Ti, respectively, whereas the fracture toughness KIC gradually increased from 8 to 13 MPa m1/2. For cutting rocks, the wear significantly decreased with 5–15 vol% cBN@Ti but increased with 20 vol% cBN@Ti because of cBN particles pull-out.

Keywords

WC–Ni cemented carbideTi-coated cBNspark plasma sinteringmechanical properties
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 22 , 28 November 2019 , pp. 3844 - 3852
Copyright
Copyright © Materials Research Society 2019 

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