...After sintering, for machine parts, sizing may be performed to improve dimensional accuracy, recompression and resintering to improve density, and powder forging may be performed. For hard alloys, hot isostatic pressing (HIP) may be performed to eliminate tiny residual voids. The above are common methods of powder metallurgy, but recently, for nickel-based superalloys, aluminum-based alloys, and titanium-based alloys, a method has been used in which the rapidly solidified alloy powder is placed in a can and hot forged to make it dense, thereby obtaining high-performance materials. *Some of the terminology that mentions "HIP" is listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…焼結後の処理として,機械部品などでは,寸法精度を高めるためのサイジングや,密度向上のための再圧縮・再焼結,粉末鍛造などが施される場合がある。超硬合金などでは,微小な残留空隙をつぶすため熱間静水圧焼結(HIP,hot isostatic pressing)を行うことがある。 以上は,粉末冶金の一般的方式であるが,最近は,ニッケル基超合金,アルミニウム基合金,チタン基合金などについては,急冷凝固した合金粉を缶の中に入れて熱間鍛造することにより緻密(ちみつ)化させ,高性能材料を得ようとする方式も用いられる。… ※「HIP」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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