To provide a method of manufacture of a porous Ni-Cr alloy having a skeleton composed of Ni-Cr alloy and also having sufficient toughness as well as high melting point owing to its low carbon content.
A slurry, containing Ni-Cr alloy powder, metallic Ni powder, metallic Cr powder, and Ni oxide powder in desired percentages, is formed. This slurry is applied to a foamed resin by coating. The coated material is heated to 700-900°C under a reducing gas atmosphere containing water vapor or carbon dioxide gas, by which the foamed resin is thermally decomposed and carbon is dissipated. Then, heating is carried out up to 1100-1300°C under a reducing gas atmosphere of 1100-1300°C to perform sintering, by which the porous Ni-Cr alloy is obtained. It is preferable to regulate the amount of water vapor or carbon dioxide gas to 2.5-30vol.%. As reducing gas, gaseous hydrogen or ammonia decomposed gas can be used.
SAKUMA TAKASHI
KADOKAKE SHIGERU
