| 摘要 |
PROBLEM TO BE SOLVED: To produce the molybdenum material in which crystal particles hardly change to coarse even if the material is heated at high temp. in a sintered body before being subjected to a plastic processing and excellent in toughness at low temp. and to provide the production method of the Mo material provided with a desired crystal particle size. SOLUTION: In the molybdenum sintered body in which 0.2-3.0 mass % tantalum carbide(TaC) is dispersed, at least either one of facts in which crystal particle size is 1-10μm or ductility-brittleness transition temp. is <=-50 deg.C is satisfied. The sintered body having the crystal particle size within a range of 1.0-25μm is produced by adding 0.2-3.0 mass % TaC powder to a molybdenum powder and subjecting the mixture to a mechanical alloying treatment, and after subjecting the produced powder to a hot isotropic press, subjecting the pressed matter to heat treatment and controlling a temp. and time of the heat treatment.
|
