| 摘要 |
PURPOSE:To form the coated layer of a uniform thickness having a smooth surface by isolating a material to be treated from pack powder with a thin plate having holes and by carrying out pack coating by heating. CONSTITUTION:A metallic retort is packed with the pack powder obtd. by mixing the powder of a coating material such as Al or Cr with an activator such as NH4Cl and the powder of a filler such as Al2O3. A material to be treated is enveloped in the thin metallic or ceramic plate having holes, and it is buried in the pack powder in the retort. A finemesh net of <=325 mesh is preferably used as the thin plate. The retort is then placed in the atmosphere of gaseous hydrogen or an inert gas, and the pack coating is carried out by heating. |
