| 摘要 |
PROBLEM TO BE SOLVED: To solve problems such as remarkable deterioration in contact characteristics caused by agglomeration or accumulation of oxide such as SnO<SB>2</SB>and In<SB>2</SB>O<SB>3</SB>having a low vapor pressure on the contact surface in an electric contact material not containing Cd such as an Ag-(Sn-In)Ox based material, and as a result, by inviting temperature rise of a contact piece due to high contact resistance. SOLUTION: An Ag-oxide based electric contact material is constituted by laminating a plurality of oxide layers different in a form of oxide. In the internal oxidation mechanism of the Ag-oxide based contact material, at high temperature (nearly 500°C or more), Ag generally stores oxygen of nearly 22 times its volume and by utilizing the fact that Ag can not exist stably as an oxide in advance, metal is alloyed which has a stable state by being connected to oxygen by a melting method, thereby precipitating Ag as the oxide in an Ag matrix when Ag stores oxygen. COPYRIGHT: (C)2008,JPO&INPIT
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