Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 41, Issue -, Pages 138-142Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2013.02.017
Keywords
HPHT; PcBN compact; Infiltrating method; Cemented carbide
Funding
- State Key Laboratory of Superhard Materials, Jilin University [201201]
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Polycrystalline cubic boron nitride (PcBN) compacts, using the infiltrating method in situ by cemented carbide (WC-Co) substrate, were sintered under high temperature and high pressure (HPHT, 5.2 GPa, 1450 degrees C for 6 min). The microstructure morphology, phase composition and hardness of PcBN compacts were investigated by using scanning electron microscope (SEM), X-ray diffraction (XRD) and energy dispersive spectrometer (EDS). The experimental results show that the WC and Co from WC-Co substrate spread into cubic boron nitride (cBN) layer through melting permeability under HPHT. The binder phases of WC, MoCoB and CO3W3C realized the interface compound of PcBN compact, and the PcBN layer formed a dense concrete microstructure. Additionally the Vickers hardness of 293 GPa and cutting test were performed when sintered by using cBN grain size of 10-14 mu m. (C) 2013 Elsevier Ltd. All rights reserved.
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