| http://www.w3.org/ns/prov#value | - The present invention is provided under the above situation as a background, and provides a method in which a strengthened platinum material can be produced, in which no blisters occur on the surface of the material even after heat treatment of 1,400??? C. or higher and a metal oxide such as zirconium oxide is finely dispersed, and which has excellent high-temperature creep properties, when the st
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