| 摘要 |
PURPOSE:To produce an aluminum base material for vacuum deposition by which a suitable product formed by vacuum deposition without surface defects is obtainable by subjecting the aluminum base material to a heat treatment in a vacuum prior to vapor deposition. CONSTITUTION:An aluminum base material obtd. by gas bubbling treatment of molten aluminum preferably prior to casting is subjected to a vacuum heat treatment at a suitable timing since casting till vacuum deposition treatment. The treating conditions for the vaccuum heating are about <=10<-3>Torr, more preferably about 10<-5>Torr high vacuum, about >=300 deg.C, more preferably about 450-550 deg.C heating temp., and about 1-2hr heating time which is longer the better. The gas in the aluminum base material is effectively removed by the above-mentioned treatment and the adequate product formed by vacuum deposition without surface defects such as blister, crack, pinhole, etc. is obtd. |
