Tungsten is an important alloying elements in the steel industry, can improve the strength of steel, hardness and corrosion resistance. Tungsten-containing carbide (tungsten carbide), which is hard, wear-resistant, corrosion-resistant and heat-resistant, is used to make drills, tools and parts that are resistant to high temperatures. Tungsten- copper (or tungsten- silver ) alloy containing 60% to 90% of tungsten is an excellent contact material and can be used as a key, a knife switch, a circuit breaker, and a spot welding electrode. Tungsten- nickel- copper alloy can be used as a shield for radiation. In the rocket engine, the unsatisfactory cooling nozzle made of tungsten and tungsten infiltrated copper (silver) can withstand high temperatures of 3127 ° C and withstand high pressure and high stress. High-density tungsten alloy is an important material for armor-piercing projectiles, and is also used in sports equipment such as bowling balls and javelins. Light-emitting material emitter electrodes and radiation cathode targets are used in the lighting and electronics industries. It can also be used as a heating element for high temperature resistance furnaces. Tungsten and tungsten-rhenium thermocouple (26%) alloys thereof, the measurable temperature range from room temperature to 2835 ℃. Di- selenide can be used as a lubricant for self-lubricating bearings with a lubrication temperature range of -217 to 350 °C. Tungsten compound pigments are durable.
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