Silver tungsten carbide-molybdenum composite electrical contact material as well as skeleton powder and preparation method thereof

Abstract

The invention discloses a silver tungsten carbide-molybdenum composite electrical contact material as well as skeleton powder and a preparation method thereof. According to the technical scheme, the preparation method comprises the steps of ball-milling and mixing ultrafine tungsten carbide powder and nano molybdenum trioxide powder; enabling molybdenum trioxide to react with free carbon in tungsten carbide in a high-temperature inert atmosphere to form molybdenum dioxide, discharging carbon dioxide, mixing tungsten carbide, molybdenum trioxide and molybdenum dioxide mixed powder with a certain amount of pure silver powder, and sintering the mixture in a high-temperature reducing atmosphere to convert molybdenum dioxide and molybdenum trioxide powder into molybdenum powder; and then obtaining the compact ultrafine silver tungsten carbide-molybdenum composite material by adopting conventional pressing, sintering and infiltration processes. Compared with traditional silver tungsten carbide, the ultrafine silver tungsten carbide-molybdenum composite electrical contact material eliminates negative effects caused by free carbon, is higher in product compactness and strength, has very good wear resistance and burning loss resistance, and has a longer electrical life when used in a low-voltage electrical appliance.

Description

technical field [0001] The invention belongs to the field of electric contact material manufacturing technology, and specifically refers to a silver tungsten carbide-molybdenum composite electric contact material and a preparation method thereof. Background technique [0002] The electrical contact material is the core part of the electrical switch, which is responsible for the task of connecting and breaking the circuit and load current, so its performance determines the performance and operation reliability of low-voltage electrical appliances. Silver tungsten carbide material has begun to replace some silver tungsten materials for low-voltage molded case circuit breakers, In electrical products such as universal circuit breakers, leakage protection switches, and dual power transfer switches. It is generally used as a moving contact material in conjunction with silver graphite, silver tungsten carbide graphite, etc., and can also be paired statically and dynamically. [...