Electrical contact material. This is the most important […]
Electrical contact material. This is the most important class of electrical materials with high arc erosion resistance and resistance to fusion welding. It is used as electrical contacts, electrical contacts and electrodes in various high and low voltage switchgear and some meters. The electrical contact is the largest type of tungsten-copper material, especially the tungsten-copper material with the largest copper content of It is mainly used in medium and high voltage and medium and large current switching devices. For example, the protection circuit breaker contacts and other contacts and contacts of the transmission network.
Tungsten-copper contacts with 15% to 20% Cu can be used on circuit breakers with voltages up to 500,000 V or higher.Electrically processed materials. Refers to electrodes and mold materials used in resistance welding, electric riveting, electric upsetting, and EDM. EDM requires electrodes or mold materials to have good electrical conductivity and arc ablation resistance to ensure processing accuracy, so tungsten and copper materials are often used. Resistance welding is also often made of tungsten copper. Electric riveting and electric upsetting are also made of tungsten-copper in some cases. Instantaneous high-temperature materials are an important and special tungsten-copper material that can be used at temperatures close to the melting point of tungsten and slightly above the melting point of tungsten.
The working time is very short, and the mission is completed in a few seconds to 200 seconds, so it is called instantaneous high temperature material. This type of material is mainly used to make high-temperature components of spacecraft, such as rocket nozzles, gas rudders in the direction of guided missiles, missile ends head cones, nose cones, and other components. Anti-ablative and thermal shock resistance is the most important performance of instantaneous high-temperature materials, because the gas temperature of solid fuels is generally as high as , the gas stream contains a lot of solid particles, for nozzles, gas rudders and other components Severe scouring and ablation; and these components work under conditions of rapid temperature rise a few seconds rise to operating temperature), thus causing severe thermal shock damage to the components. For the end, when the aircraft flies into space and then enters the atmosphere, it is subject to high temperature and erosion due to the intense friction of the particle cloud due to its high speed.
Tungsten-copper materials are preferred materials that meet the above requirements. With the successful development and development of carbon-carbon fiber composite materials, rocket nozzle throat linings are increasingly used for manufacturing because of its light weight and good thermal shock resistance. However, its ablation resistance is far less than that of tungsten-copper materials. For those nozzles, gas rudders and other components that require high ablation resistance, tungsten-based materials must be used to make tungsten-copper materials, which can be used as armor-piercing materials. A so-called "drug cover" material. A cup-shaped or funnel-shaped cover is made of tungsten-copper material (commonly used W-30Cu material), which is flipped over the front end of the ammunition, and the cover is deformed into a jet and pierced by the temperature and pressure of the gunpowder. This type of hood was first made of copper and used in large quantities. In order to increase the unit mass of the cover and improve the armor-piercing ability, a tungsten-tantalum material-type cover having a unit mass larger than that of copper was developed, and in an ideal case, it has an armor-removing ability of about 30% higher than that of the copper cover.