The microstructure of cBN-metal composites synthesized from hBN with metallic solvents

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• 作者：Akhmadi Eko ; Osamu Fukunaga ; Naoto Ohtake
• 关键词：hBN ; cBN ; High pressure ; Metal solvent ; Synthesize
• 刊名：International Journal of Refractory Metals and Hard Materials
• 出版年：2013
• 出版时间：November, 2013
• 年：2013
• 卷：41
• 期：Complete
• 页码：73-77
• 全文大小：1446 K

文摘

Cubic boron nitride (cBN)-metal composites were synthesized from hexagonal boron nitride (hBN) using Co-Cr-Al, Co-V-Al and Co-Cr-V-Al as infiltration solvents under high pressure and high temperature conditions (5.6 GPa and 1700 ¡ãC for 30 min). The alloy compositions employed in the present study were (in weight percent) Co70-Cr22-Al8, Co80-V10-Al10, Co84-V6-Al10 and Co70-Cr19-V3-Al8. It was found that the size of cBN grains in the composites synthesized using Co-V-Al solvent was relatively finer compared with the ones synthesized using Co-Cr-Al. It was also confirmed that the grain growth of cBN could be suppressed by adding a small amount of V to the Co-Cr-Al solvent. We suggest that V might be used as an additive in the metal solvent during sintering of fine grains cBN compact, where the microstructure homogeneity and the cBN abnormal grain growth are the important issues.