Tungsten is an important alloying element in iron and steel industry, which can improve the strength, hardness and corrosion resistance of steel. Spinning processing need tooling mainly includes the wheel, core mold, the tail and other auxiliary equipment, in the process of molybdenum crucible spinning, PuXuan process due to the change of product taper, the mandrel must be compatible with gradient of core modules, in the process of large molybdenum crucible PuXuan, using three different taper of mandrel after products to ensure that the final forming of taper containing tungsten carbide (tungsten carbide), high hardness, wear resistance, corrosion resistance and heat resistance, used in the manufacture of drill bits, cutting tools, and high temperature resistant parts, etc. Tungsten billet is prepared by powder metallurgy. It is hot-rolled into sheet with designed thickness by hot rolling process. The sheet is processed into round sheet and then placed on hot spinning machine. The tungsten plate and mould are kept concentric. After several times of spinning, the shape of the tungsten plate becomes a crucible, and the tungsten plate wall becomes thinner and clings to the mold. After cooling, the spinning tungsten crucible is obtained. Tungsten-copper (or tungsten-silver) alloy containing 60 ~ 90% tungsten is an excellent contact material, which can be used as key, knife switch, circuit breaker and spot welding electrode. The part is a deep cylinder with a depth of 13mm and a bottom diameter of 12mm. Tungsten nickel copper alloy can be used as a shield for alpha and gamma rays. In the rocket engine, the uncooled nozzle made of tungsten can withstand high temperature of 3127℃ and withstand high pressure and thermal stress. It is used as luminescent material and X-ray cathode target in lighting and electronics industry. Assemble the mould according to the size required by the charging of compactor, put the raw material of tungsten powder in the mould and seal it into the cold isostatic press for pressing. The forming pressure is generally 0 ~ 0MPa. It can also be used as heating body of high temperature resistance furnace. Thermocouple of tungsten and tungsten-rhenium (26%) alloys, measuring temperature range from room temperature to 2835℃. Tungsten colorimetric method includes dithiophenol method, hydroquinone method, rhodamine B method and thiocyanate method, etc. The first three methods have more interfering elements, complicated operation, little practical significance, thiocyanate method is simple to operate, less interfering elements, good accuracy and reproducibility, which are widely used at present. Tungsten selenide can be used as a lubricant for advanced lubrication bearing, and its lubrication temperature range is -217 ~ 350℃. The compound pigments of tungsten have a bright luster and are durable. In recent years, tantalum niobium capacitors have expanded into the field of high capacity, tantalum niobium in aerospace industry and irreplaceable tantalum niobium base alloy and other special alloys will continue to develop steadily. According to the development of the world high-tech industry, tantalum niobium industry will maintain a growth rate of more than 12% in the next 5 to 10 years. Tantalum niobium new materials have broad development space and market prospects. At present, the application of tantalum niobium new materials related high-tech industries including electronics, precision ceramics and precision glass industry; Electro-acoustooptic device; Hard alloy; Aerospace and electronics industries; Biomedical engineering; Superconducting industry; Special steel and other industries. Tantalum is widely used in medical equipment, alloy, carbide, mobile phone, digital camera, notebook computer and other production fields.
Tag: tantalum , niobium
