Kinetics of phase transformation from hBN to cBN in the presence of Mg₃BN₃ catalyst

O. Fukunaga Dept. Inorganic Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152, JAPAN

S. Nakano Dept. Inorganic Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152, JAPAN

J. Maki Dept. Inorganic Materials, Tokyo Institute of Technology, Meguro-ku, Tokyo, 152, JAPAN

H. Vollstaedt Inst. High Pressure Geophysics, Acad. Sci. GDR, Potsdam, GDR

H. Lorenz Inst. High Pressure Geophysics, Acad. Sci. GDR, Potsdam, GDR

Abstract

Transformation kinetics from hBN to cBN has been studied at 6 GPa with changing reaction temperature and content of catalyst mixed with hBN powder. At lower catalyst content (3–10 wt %), rate of transformation was extraordinary rapid between 1300 and 1350 C. At higher catalyst content (30–50 wt %), rate of transformation was decreased. Normal nucleation kinetics was observed at about 1500 C. The rapid transformation temperature region correlates characteristic behavior of the sintering process.

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Kinetics of phase transformation from hBN to cBN in the presence of Mg₃BN₃ catalyst

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Kinetics of phase transformation from hBN to cBN in the presence of Mg₃BN₃ catalyst