High-pressure and high-temperature generation using diamond/sic composite anvils prepared with hot isostatic pressing |
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Authors: | Osamu Ohtaka Naoyuki Ohnishi Katsuyuki Kubo Hiroshi Arima Hiroshi Fukui Takamitsu Yamanaka |
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Affiliation: | 1. Earth and Space Science , Graduate School of Science, Osaka University , Toyonaka, 560-0043, Japan ohtaka@ess.sci.osaka-u.ac.jp;3. Earth and Space Science , Graduate School of Science, Osaka University , Toyonaka, 560-0043, Japan |
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Abstract: | Using a hot isostatic pressing (HIP) technique, we synthesized diamond/SiC composites from diamond and Si powders. At an HIP condition of 1450 °C and 100 MPa, a pressure much lower than that of the diamond stability field, diamond powders react with molten Si to form well-sintered diamond/SiC composites. Cubes of the composites with 15 mm edge length were thereby fabricated, and an application to the second stage anvils in a Kawai-type high-pressure apparatus was attempted. A hybrid anvils system using four cubes of the composites and four of the conventional WC was introduced and heating experiments up to 1600 °C became possible. Because the diamond/SiC composites are transparent to X-rays, the present system is applicable not only to diffraction studies but also to radiographic studies that need a larger window for an X-ray image. |
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Keywords: | Diamond composite SiC Hot isostatic pressing (HIP) High-pressure anvils Synchrotron radiation Multi-anvil high-pressure apparatus |
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