High Pressure and High Temperature Sintered PcBN Using Al, B₄C and C as Sintering Additive

Abstract:

Polycrystalline cubic boron nitride (PcBN) composites were sintered by high pressure and high temperature sintering (HPHT) at 1450 °C for 3 min under a pressure of 5.0 GPa. Aluminium,boron carbide and carbon in the starting mixture reacts with cubic boron nitride (cBN) to form Al₃BC₃ and AlN bonding among cBN grains during sintering. X-ray diffraction (XRD) and Scanning electron microscope (SEM) were used to analyze phases and micro-structure of the sintered samples. The dense structure of super hard cBN grains bonded together with Al₃BC₃ and AlN offers superior hardness and high strength. The Vickers hardness of PcBN composites was 45±5 GPa, and the strength of PcBN composites was 345±15 MPa.

• Periodical: Key Engineering Materials (Volume 697)
• Pages: 521-525
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.697.521
• Online since: July 2016
• Authors: Yao Ma, Jian Li, Hai Long Wang*, Rui Zhang
• Keywords: Al₃BC₃, High Pressure High Temperature (HPHT) Sintering, Mechanical Properties, PCBN

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