真空焼結した青銅合金の圧環強度評価―硫化物とすずの影響について―

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タイトル別名
  • Evaluation of Radial Crushing Strength on Bronze Sintered in Vacuum Atmosphere―Effect of Sulfide and Tin―
  • シンクウ ショウケツ シタ セイドウ ゴウキン ノ アツカン キョウド ヒョウカ : リュウカブツ ト スズ ノ エイキョウ ニ ツイテ

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説明

Copper (Cu) alloys are used as sliding materials. Especially, bronze (Cu-Sn alloy) is popular material for sintered bearings. In the sintering process, the reductive atmosphere is generally adopted on an industrial field to reduce the oxide which exists on the surface of Cu-Sn alloy powders as atomized. However, sintering in the vacuum atmosphere is useful because of disusing any kinds of gases. It was reported that sintering in the vacuum atmosphere gives better properties unless the alloy powder is heavily oxidized. In this report, the radial crushing strengths was investigated for the sintered Cu-Sn alloys which were the bronze and the sulfide dispersed bronze (Sulfide bronze). Especially tin powder and fine tin powder were used as the additives mixed for the Cu-Sn alloys to compare the radial crushing strengths. With increasing compacting pressure and sintering temperature, the pores in the sintered specimen were decreasing, and the sintered specimen which had lower porosity indicated high radial crushing strength. And on the sulfide bronze the feature of the fracture surface depended on tin content. In the specimen with lower tin content the interface between the bronze matrix and sulfide particle became the origin of the fracture, while in the one with higher tin content the Cu-Sn intermetallic compound which was so hard and brittle became the origin of the fracture.

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