AG-MAGNESIUM OXIDE ELECTRICAL CONTACT MATERIAL EXCELLENT IN DEPOSITION RESISTANCE AND CONSUMPTION RESISTANCE

摘要

PROBLEM TO BE SOLVED: To obtain an Ag-MgO electrical contact material excellent in deposition resistance and consumption resistance by forming a mechanical alloying joining layer on the interface between fine MgO grains, dispersedly distributed in a specific proportion in an Ag matrix, and this Ag matrix. ;SOLUTION: A structure, in which fine MgO grains of ≤1μm average grain size are dispersedly distributed by 1-8wt.% in an Ag matrix and a mechanical alloying joining layer exists in the interface between the MgO grains and the Ag matrix, is formed. This structure can be obtained by mixing Ag powder of ≤100mesh and MgO powder of about 5-10μm average grain size in the prescribed proportion, introducing the resultant powder mixture into an attritor, and performing mixing for the prescribed time to apply mechanical alloying treatment. It is preferable to apply heat treatment to an electrical contact material composed of the resultant composite powder in the air at about 500°C to oxidize and stabilize the mechanical alloying joining layer.;COPYRIGHT: (C)1997,JPO