Behavior of oxide film at bond interface of diffusion bonding of aluminum.
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概要
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Aluminum which had been i) wire brushed, ii) emery paper polished and electropolished, and iii) wire brushed and electropolished was diffusion welded. The morphology and distribution of the oxide are strongly influenced by the surface treatment. When the faying surface subjected to the treatment i) is welded, a number of oxide particles distribute within a zone 1 to 3μm in thickness along the bond interface. The zone consists of many small grains less than 1μm in diameter. The formation of the zone is attributed to plastic deformation and a number of oxides introduced by wire brushing. The zone involving the oxide has a harmful effect on the bond strength, because the surface treatment i) results in a bond strength much lower than the treatments ii) and iii). When faying surfaces subjected to the treatments ii) and iii) are used, on the other hand, thin oxide films 20 to 40nm in thickness are observed only along the bond interface. The portion of the bond interface where the oxide is broken up extends when faying surfaces are subjected to the treatment iii) rather than subjected to the treatment ii). A higher bond strength is obtained by using the treatment iii).
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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