Arc Ablation of Copper Tungsten Alloy Contacts

    The electrical contact is the core component of the high-voltage circuit breaker household appliance. At the moment when the power switch is closed, the contact gap will cause an arc with high temperature and high kinetic energy, which will ablate the surface of the contact. Arc ablation goes through 3 whole processes: first, evaporation and magnetron sputtering of existing appendages and low melting point copper on the surface, secondly, the melting and sputtering of copper and refrigeration condensation achieve a stable balance, and finally the surface is convex and concave Significant ablation of unevenness and tungsten frame. Therefore, it is stipulated that tungsten copper alloy has good comprehensive properties, especially arc ablation resistance, so as to increase the service life of the material.

    Compared with other high-quality copper-silver alloy contact materials, tungsten-copper alloy has better comprehensive performance. In 2018, RenjieLin et al. "selected 9 more commonly used contact materials (CuCr10, CuCr20, CuCr30, CuCr40, CuCr50, WCul0, WCu20, WCu30 and CuW-WC), and carried out a vertical electromagnetic field (axial magnetic field, AMF) electrical level. The vacuum pump arc penetration experiment. According to the arc shape, anode and cathode surface shape and other factors, it is confirmed that tungsten-copper alloy has stronger arc ablation resistance than copper-nickel-iron alloy. RenjieLin et al. CuCr30, CuCr40, WCul0, WCu30 and CuW-WC) carried out the vacuum pump arc ablation experiment 0. According to the comparison, the arc of the precision copper alloy contact is evenly distributed on the surface, and there are many bright negative spots; When the arc is ignited smoothly, the tangential spread rate of the WCul0 negative electrode spot is less, only 25% of that of CuCrl0; the tungsten-copper alloy also has good melting resistance. Therefore, when the current carrying of the power switch is relatively large, the arc is easy to spread. To all surfaces of aluminum alloys, WCul0 is the raw material of choice with excellent ablative properties.