Synthesis of Cubic Boron Nitride Crystals Using Ni–Cr and Ni–Cr–Al Solvents under High Pressure
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概要
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Cubic boron nitride (cBN) was synthesized using Ni–Cr and Ni–Cr–Al solvents under high pressures (4–6 GPa) and high temperatures (1300–1700 °C). The size of the cBN crystals obtained in the Ni–Cr solvent (synthesized at 5.5 GPa and 1400 °C for 30 min) was approximately 130 μm. It was found that adding Cr to the Ni solvent enhanced cBN growth, resulting in a high yield of cBN. The growth temperature and pressure affected the morphology of the grown crystals. Moreover, adding Al to the Ni–Cr solvent reduced the low-pressure limit of cBN formation by about 1 GPa. The cBN crystals obtained with the Ni–Cr–Al solvent (synthesized at 4.1 GPa and 1450 °C for 3 h) were well-facetted single crystals with size of several hundred micrometers.
- 2009-07-25
著者
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Taniguchi Takashi
National Institute For Materials Science
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Taniguchi Takashi
National Institute of Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan
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Kubota Yoichi
National Institute for Materials Science, Tsukuba, Ibaraki 305-0044, Japan
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