Palladium-based alloy electrical contact material and preparation method for same

Abstract

The invention relates to a palladium-based alloy sliding electrical contact material and a preparation method for the same, and belongs to an electrical contact material. A palladium-based alloy comprises the following chemical components in percentage by weight: 1.0 to 30.0 percent of Ru, 0.1 to 5.0 percent of Nb, 0.1 to 5.0 percent of Zr, 0.1 to 5.0 percent of Mo, 0.1 to 5.0 percent of Ta, 0.1 to 5.0 percent of Yb, 0.1 to 5.0 percent of Sm, 0.1 to 5.0 percent of Tb and the balance of Pd. The preparation method comprises the following steps of: blending metallic elements such as Pd, Ru, Nb, Zr, Mo, Ta, Yb, Sm, Tb and the like according to a proportion in a chemical component design formula of the alloy, preparing a PdRuNbZrMoTaYbSmTb nine-element alloy in a high-frequency or intermediate-frequency smelting furnace, and treating the alloy by using the processes of extrusion, rolling, drawing, heat treatment and the like to finally obtain a finished product with a belt shape, a wire shape, an irregular shape and the like. The alloy material has the characteristics of high melting point, high hardness, high abrasion resistance, corrosion resistance, low contact resistance, high welding resistance, high arc erosion resistance and the like, is a high-performance electrical contact material, and has broad application prospect in the fields of electromechanics, electronics, electrical appliances and the like.

Description

technical field [0001] The invention relates to a rare metal palladium-based sliding contact electrical contact material and a preparation method thereof, belonging to the field of metal materials. Background technique [0002] Due to the development needs of electromechanical, electrical appliances, electronics and other fields, new sliding contact materials with high melting point, high hardness, high wear resistance, corrosion resistance, low contact resistance, welding resistance and arc ablation resistance have become urgently needed. Materials, palladium alloy electrical contact materials are required to have: (1) high chemical stability; (2) wear and corrosion resistance; (3) good manufacturing and processing performance; (4) low and stable sliding contact resistance; (5) ) Excellent resistance to fusion welding and arc ablation; (6) By adding multiple rare metal elements to replace expensive precious metal elements, the cost of raw materials can be reduced, precious ...

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Problems solved by technology

[0007] However, after long-term use, it has been found that palladium-silver alloy electrical contact materials have deficiencies, such as: (1) The arc erosion pits on the surface of electrical contacts are serious, showing protrusions or pits; (2) The metal transfer is obvious, so that the contact materials Welding; (3) The contact device fails prematurely, which affects the reliability and electrical life of the overall component, etc.

For example, transition group elements such as niobium, chromium, zirconium, tungsten, and nickel have been successfully applied to palladium, and transition group elements such as niobium, iron, tungsten, and zirconium have been successfully applied to ruthenium, but they cannot completely replace Pd- Ru alloy target

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