Interaction of Al and cBN under High Temperature and High Pressure

doi:10.3724/SP.J.1077.2008.00253

Abstract

Abstract: Polycrystalline cubic boron nitride (PcBN) samples were obtained by sintering cBN and aluminum micro-powders in volume ratio of 7:3 at high temperature (1300--1500℃) and high pressure (5.5GPa). The identification and the morphology of phases, and the distribution of elements in PcBN samples were studied by using X-ray diffraction (XRD), transmission electron microscope (TEM), selected-area electron diffraction (SAED), and energy dispersive X-ray spectrometry (EDS). Results show that Al does not react with cBN at 1300℃. When the temperature is increased to 1400℃, Al can react with cBN to form AlN and AlB₂, and the temperature is increased to 1500℃, the amount of products increases. TEM and EDS analyzing results indicate that Al atoms diffuse into surface layer of cBN particle, and B atoms diffuse into Al zone, forming new phases AlN and AlB₂.

Key words: cBN, sinter, high temperature and high pressure, interaction

CLC Number:

TG164

ZHAO Yu-Cheng,WANG Ming-Zhi. Interaction of Al and cBN under High Temperature and High Pressure[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2008.00253.

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Interaction of Al and cBN under High Temperature and High Pressure

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