| 摘要 |
PURPOSE:To proceed with refinement of metallic oxide, and enhance the hardness of a contact material at high temperature so as to improve the melting and adhering resistance thereof by using Mn and Al at the same time other than Zn as metallic elements of metallic oxide dispersed in the base of Ag. CONSTITUTION:Formation of metallic oxide in the base of Ag is performed by so-called internal oxidation. The metallic oxide can be refined and dispersed by producing an ingot including Zn, Mn and Al into Ag, and oxidizing the inside. If Mn or Al is included alone, refinement of the metallic oxide, that is, temperature strength factor cannot be sufficiently improved, however this is improved sufficiently by including Mn and Al at the same time. The metallic oxide is dispersed in the base of Ag accordingly as it is preferably refined and hot hardness characteristic is improved. |
