As a basic component in smart grid, intelligent ACB has always been a hot research topic in the field of low-voltage electrical appliances. With the introduction of microprocessors into circuit breakers, combined with microelectronics technology, sensing technology, etc, intelligent ACB have complete protection functions and a high degree of intelligence. In addition, the breaking capacity has also been improved. In order to improve the reliability, continuity and safety of the power supply system, and to narrow the gap with foreign advanced levels, it is very necessary to develop highly intelligent selective ACB.

    AgNi(30)C(3) have good welding resistance, low contact resistance and stability, and are often paired with AgW50 and widely used in intelligent ACB. In this study, mechanical powder mixing method and chemical coating method were used to prepare AgNi(30)C(3) powder. The performance differences of the materials prepared by the two methods were compared, and the changes in the structure and properties of the materials under different preparation process conditions were analyzed.

    In conclusion:

    ① The AgNi(30)C(3) contact material prepared by the chemical coating method has small particles, uniform dispersion, and high matrix bonding strength；the material prepared by the mechanical powder mixing method has serious agglomeration, and the interface bonding is mechanical fusion, affecting material properties.

    ② The fracture surface of the AgNi(30)C(3) contact material prepared by the chemical coating method is composed of many interconnected tear edges and small dimples, and the interface bonding strength is high；the fracture surface performance of the mechanical powder mixing method is brittle, the interface bonding is poor and the reinforcement phase falls off easily.

    ③ The hardness and density of the AgNi(30)C(3) contact material prepared by the chemical coating method are higher than that of the mechanical powder mixing method, and the resistivity is lower than that of the mechanical powder mixing method. The overall performance of the material is better.

——The content of the article comes from the Internet