생산기술특허연구회

"To overcome the undesirable deformation, peeling off and geometrical restrictions which were mainly caused by differences in thermal expansion coefficients during the cladding of aluminum strip and stainless strip, new processing method based on vacuum die casting is designed and implemented in fabricating Al/Fe-17wt%Cr steel(stainless steel). To increase cast-bonding ability, the surface of Fe-17wt%Cr steel is electrochemically etched to have optimum pit size and density. The implementation of vacuum die casting by using surface treated stainless steel(Fe-17wt%Cr Steel) produces good trial products having acceptable cast-bonding ability. The optimum conditions enabling cast-bonding are as follows, Pit size above 0.2mm, Pit density : above 30%, Preheating temperature for insert (Fe-17wt%Cr Steel): 250-350℃, Filling speed : 30m/sec, Pouring temperature : 690℃, Casting pressure : above 800kg/㎠. The microscopic observation of cast-bonded Al-Fe-17wt%Cr steel does not show any evidence of intermetallic compounds. The bonding strength of trial products is 150-400kg/㎠ and this is stronger than conventionally cladded metal having 30-70kg/㎠. " 더 자세한 내용은 첨부파일 참조