| 摘要 |
PURPOSE:To produce a produce consisting of a shape memory alloy having intricate shapes by depositing the powder of the shape memory alloy by plasma thermal spraying onto a core mold having the shape desired to be obtd. in an atmosphere which can be controlled in oxygen partial pressure, then selectively dissolving away the core mold. CONSTITUTION:The powder of the Ti-Ni alloy or Cu-Al-Ni alloy which has the shape memory property in a bulk state is deposited by the plasma thermal spraying on the surface of the Cu core mold formed to the desired shape in the atmosphere of <=1.3X10<-7> gaseous oxygen partial pressure to form the molding consisting of the shape memory alloy having the prescribed thickness. The core mold Cu is then dissolved away by nitric acid by which the molding having the same shape as the shape of the core mold is obtd. After such molding is heated for about one hour at 700 deg., the molding is subjected to a heat treatment for relieving stress then to a shape memory treatment. The product consisting of the shape memory alloy which has fine structure of <=5mum average crystal grain size, excels in machinability an shape memory property and has the intricate shapes is thus produced. |
