Electrical contacts are key components in low-voltage electrical appliances, and their performance directly affects the stability and reliability of electrical appliance operation. Among electrical contact alloy materials, silver alloy material is the most important electrical contact material with the largest amount of precious metals. In order to improve the performance of electrical contacts and achieve the purpose of saving silver, a series of silver-based electrical contact materials have been developed.

    AgZnO electrical contact material, as one of the alternatives to AgCdO, is an environmentally friendly electrical contact material. The electrical contact materials containing 8%-12% ZnO can be successfully prepared by alloy powder preoxidation method. With the increase of ZnO content, the resistivity, hardness and tensile strength increase, and the accumulation of ZnO particles inside the materials increases. Under the condition of low current less than 20A, the electrical life decreases with the increase of ZnO content, and the electrical life verification performance of AgZnO(ZnO content 8%) materials is the best, reaching more than 200,000 times. With the increase of ZnO content, the cracks and pores on the contact surface increase and the electrical life decreases under the action of electric arc.

    AgZnO electrical contact material has the characteristics of resistance to arc erosion, resistance to welding, electrical resistance to wear, low and stable contact resistance, etc. It also has the characteristics of resistance to large current surge, good breaking performance, fast arc extinguishing speed, resistance to electrical corrosion, and non-toxicity. so it has been used in air circuit breakers, leakage circuit breakers, MCB, contactors, disconnect switches, transfer switches, protective switches, etc. The alloy powder pre-oxidation method produces environmentally friendly silver-zinc oxide contact materials. It is easy to process and the material has superior electrical properties. It is a new type of contact material and has broad market prospects.

——The content of the article comes from the Internet