关键词: 巴氏合金, 脱胎, ε相（Cu6Sn5）, β′相（SnSb）

Abstract: A babbit peel off fault was take place in No.1 bush of an unit in some plant. The chemical composition analysis, the metallurgical structure analysis, The XRD analysis and the Xray energy spectrum analysis were accomplished for the peeled babbit alloy. The results show that the Sb content was accorded with the requirement, and the contents of Cu, Pb and Zn were not conformed to the standard. In the babbit alloy, the β′ phase（SnSb） exist slight aliquation at individual local position, but serious aliquition, delamination and other casting defects were not discovered. The average proportion of the sum of ε phase（Cu6Sn5） and β′ phase（SnSb） was 39.5%, there was ε layer discovered at the alloy side of joint surface Sn layer. It is suggest that the allowed chemical composition deviation range and the contents requirement of hard phases should be listed clearly in the order agreement of same parts.

Key words: babbit alloy, peel off, ε phase（Cu6Sn5）, β′ phase（SnSb）