Plate shape contact

Overview:
The processing technologies of plate shape contacts include alloy internal oxidation and powder metallurgic method; silver alloy oxide contact products produced with alloy internal oxidation method mainly include AgSnO2, AgSnO2In2O3, AgZnO, AgCuO, AgCdO, etc.; silver alloy oxide contact products produced with powder metallurgic method mainly include AgW, CuW, AgWc, AgWcC, AgNi, AgNiC, AgC, silver metallic oxide, etc.

The characteristic of contact products produced with alloy internal oxidation method are as follows:
① The electrical contact products produced with alloy internal oxidation method have good material compactness, fine oxidizing substances, good arc erosion resistance and long electrical endurance.
② Ni, RE and other minor elements are added into AgSnO2, AgSnO2In2O3, AgZnO, AgCuO, AgCdO and other contact products using low-temperature high-pressure oxidation technology to achieve grain refining and dispersion strengthening, enhancing the product’s mechanical strength and improving the contact material’s welding resistance, arc burning resistance and electrical wear resistance.
③ Using smelting atomization, combined with pre-oxidation process, the material's grains are refined, the structure is uniform, the microstructure does not appear segregated, the oxide poor ridge area is eliminated, and the contact material with excellent performance is manufactured.

Material composition and physical and mechanical properties of alloy oxide contact products

The features of powder metallurgy contact products are as follows:

① The composition and quality of contact products prepared by powder metallurgy are easier to control than other process methods. The particles of other components are refined by using advanced powdering processes such as chemical coating, co-precipitation, atomization, and mechanical alloying. , And evenly distribute the silver or copper matrix to ensure the consistency of the contact product performance, improve the metallographic structure of the contact material, and improve the performance of the contact product.
② Silver-graphite contact products are produced by sintering and extrusion process, and its density is as high as 99.9%. At the same time, the second component graphite is distributed in the form of fibers in the silver matrix, and the fiber arrangement direction is perpendicular or parallel to the surface of the electrical contact product. The physical and mechanical properties of the material have been greatly improved, and at the same time, the product has better electrical properties such as resistance to welding, arc burn resistance, and low and stable contact resistance.
③ We combine the melting atomization method with the pre oxidation method to avoid segregation of grain refining, texture uniformity and microstructure, eliminate the areas with less oxides, and manufacture contact materials with outstanding performance.

Material composition and physical and mechanical properties of alloy oxidation contact products