Method for forming composite vapor-deposited films with varied compositions formed in the initial and final stages of deposition, composite vapor-deposition material for the film and method for manufacture thereof

A method for forming a composite deposited film with varied compositions formed in an initial and a final stage of evaporation, comprising the steps of:

• mixing a powder of aluminum or an alloy thereof with a powder of a metal whose vapor pressure is lower than the aluminum or the alloy thereof to form a mixture of the powders,
• packing the mixture of the powders into an envelope made of aluminum or an alloy thereof,
• cold working the envelope to reduce a diameter thereof to obtain a composite structure to disperse the low vapor pressure metal powder in a core region of the envelope and distribute the low vapor pressure powder uniformly in a longitudinal direction of the core region,
• heating the composite structure under a reduced pressure, and
• vaporizing the high and low vapor pressure metals to deposit a composite deposited film on a substrate being deposited,
• the composite deposited film being rich in the high vapor pressure metal in an initial evaporation stage, rich in the low pressure metal in a final evaporation stage and of varied composition in an intermediate stage between the initial evaporation stage and the final evaporation stage.