Kelmet (English spelling)

Japanese: ケルメット（英語表記）Kelmet

A copper alloy for bearings containing 23-40% lead. It is used by fusing it to a thickness of about 0.5-1.5 mm onto a 2-4 mm thick mild steel base. It is characterized by minimal temperature rise during use, and is used as a high-speed, high-load bearing in aircraft, automobiles, diesel engines, etc. Copper and lead do not dissolve in solid solution, so they are prone to segregation when cast into the base. It is recommended to add a small amount of nickel, silver, etc., and then rapidly cool in cold water after casting. Recently, in order to prevent segregation, a method has become common in which coarse particles of copper or copper-nickel alloy are baked onto the base to make it porous, and then Kelmet is infiltrated into it (→Powder metallurgy). (→Bearing alloy)

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

鉛 23～40%を含む軸受用銅合金。厚さ2～4mmの軟鋼の台座に 0.5～1.5mmぐらいの厚さに融着させて使う。使用中の温度上昇の少いことが特長で，高速高荷重軸受として，航空機，自動車，ディーゼル機関などに用いられる。銅と鉛は固溶しないので台座に鋳造するとき偏析しやすく，ニッケル，銀などを少量加え，鋳造後冷水で急冷するとよい。最近は偏析を避けるため，台座に銅，銅-ニッケル合金などの粗粒を多孔性に焼付け，そこへケルメットを溶浸 (→粉末冶金 ) する方法がよく行われる。 (→軸受合金 )

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