Journal
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
Volume 50, Issue -, Pages 221-226Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ijrmhm.2015.01.015
Keywords
PcBN; Sintering behaviors; Mechanical properties; High pressure and high temperature
Funding
- National Engineering Research Center for Special Mineral Materials of China
- Guangxi Key Laboratory of Super hard Materials [14-045-16]
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Cubic boron nitride (cBN) composites, using Al and HfC as the additives, were sintered under static high pressure of 5.0 GPa and at temperatures of 700 degrees C-1500 degrees C for 80 s. By analyzing the phase components of the sintered samples through the X-ray diffraction (XRD) analysis, we found that when the temperature increased from 700 degrees C to 900 degrees C, cBN reacted with Al and HfC, and produced AlN, AlB2, HfB2 and B2C5N2. Above 1000 degrees C, AlB2 was not stable. It decomposed and finally generated AlB12. At the meantime, the content of AlN, AlB12, HfB2 and B2C5N2 increased with Al disappearing. The Vickers hardness of the sintered samples increased with increasing the cBN content. The SEM and the abrasion ratio tests revealed that the well-sintered samples with homogeneous microstructure and the best wear resistance could be obtained at 5.0 GPa, 1300 degrees C for 80 s with the cBN content of 80 wt.%. (C) 2015 Elsevier Ltd. All rights reserved.
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