Synthesis and grain size control of cubic BN using Co-Cr-Al base alloy solvents under high pressure

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• 作者：Akhmadi Eko ; Osamu Fukunaga ; Naoto Ohtake
• 关键词：hBN ; cBN ; High pressure ; Metal solvent ; Synthesize
• 刊名：Diamond and Related Materials
• 出版年：November, 2013
• 年：2013
• 卷：40
• 期：Complete
• 页码：1-6
• 全文大小：1885 K

文摘

Cubic boron nitride (cBN)-metal composites were synthesized from hexagonal boron nitride (hBN) using Co-Cr-Al base alloy as infiltration solvents under high pressures and high temperatures. To control the grain size of the cBN crystals, Mo or V was used as a substitute of Cr in the base alloy. The pressure-temperature region of the cBN formation under Co-(Cr, Mo)-Al and Co-(Cr, V)-Al systems was determined at pressure between 4 and 6 GPa and temperature up to 1700 掳C. It was confirmed that cBN was obtained at pressures above 4.4 GPa and temperatures above 1290 掳C. The grain size of cBN synthesized using Co-(Cr, V)-Al solvent was relatively finer comparing with the ones synthesized with Co-Cr-(Mo)-Al alloy solvent. Under the Co-(Cr, V)-Al alloy solvent system where both Cr and V exist, the grain size of the synthesized cBN could be controlled by changing the composition of Cr and V in the solvent.