PRODUCTION OF HYDROGEN SEPARATING MEMBRANE

PURPOSE:To obtain a hydrogen separating membrane excellent in hydrogen passing performance and not causing deterioration by plasma-spraying ceramics on the surface of a metallic porous body as a substrate, forming a Pd or Pd alloy film by vacuum plasma spraying and subjecting the surface of the film to blasting and heating to a high temp. CONSTITUTION:A metallic porous body having mechanical strength is used as a substrate and ceramics is plasma-sprayed on the surface of the substrate to carry out barrier coating. The substrate is then coated with a Pd or Pd alloy film by vacuum plasma spraying in a prescribed thickness. Since the Pd or Pd alloy film has a few pores and a rugged surface, it is made efficiently free from defects by blasting and heating to a high temp.