A Cu-Al alloy with copper as the main component and 15% or less by mass of aluminum. Available for wrought materials and castings. Easier to forge and roll than Cu-Sn alloy, harder, with a smaller coefficient of friction and higher corrosion resistance. Suitable for gears, bolts, nuts, bushings, bearings, etc. It is forged or rolled at high temperatures of 600-800 °C and finished at room temperature. If cast from this alloy is left as cast, it will undergo self-annealing and will have very coarse crystal grains. To prevent this phenomenon, the casting should be removed from the mold at high temperatures and quenched with water from 570 °C or above, but this method is difficult for very thick pieces, so a third element of 1-6% by mass of iron, 0.5-2% by mass of manganese, or 1-5% by mass of nickel is added. Depending on the aluminum content, some are highly workable and others are suitable for casting, so it has a wide range of uses. Castings include propellers, shaft sleeves, pump impellers, seawater valves, etc., and propellers weighing over 40 tons are also manufactured for 200,000-ton tankers. [See other terms] Bronze Source: Morikita Publishing "Chemical Dictionary (2nd Edition)" Information about the Chemical Dictionary 2nd Edition |
銅を主成分としたCu-Al合金で,アルミニウムが15質量% 以下の合金のこと.展伸材用と鋳物用がある.Cu-Sn合金よりも鍛造,圧延が容易で,しかも硬く,摩擦係数が小さく,耐食性も高い.歯車,ボルト,ナット,ブッシュ,軸受などとしても好適である.これは600~800 ℃ の高温で鍛造,または圧延して常温で仕上げる.この合金の鋳物は鋳放しのままでは自己焼鈍(self-annealing)を起こして,非常に粗大な結晶粒となる.この現象を防止するには,鋳物を高温で型から取り出し,570 ℃ 以上から水で急冷するとよいが,非常に厚肉のものでは,この方法では難しいので,第三元素として,鉄1~6質量% またはマンガン0.5~2質量%,あるいはニッケル1~5質量% 程度を添加する.アルミニウム含有量によって加工性に富むものと鋳物に適するものとがあるので用途は広い.鋳物としては,プロペラ,軸スリーブ,ポンプ羽根車,海水弁などで,20万t タンカー用の40 t を超える重量のプロペラも製造されている.[別用語参照]青銅 出典 森北出版「化学辞典(第2版)」化学辞典 第2版について 情報 |
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