Tungsten powder
The raw material used to make tungsten products and processing materials is powdered tungsten.
Tungsten Powder Properties
The hardest metal, tungsten, is hard. Hardness for sintered tungsten spheres ranges from 200 to 250, while hardness for tungsten rods passed through a rotating hammer is between 350 and 400. Mixture of nitric and hydrofluoric acids is used to dissolve tungsten powder. The powder then melts with a mixture sodium hydroxide/sodium carbonate.
Tungsten (a gray-black metal) is characterized by metallic luster and body-centered cubic crystals. Tungsten powder can be dissolved in some acids, including sulfuric acid, nitric acid and aqua regia. However, it cannot dissolve in water, hydrofluoric and potassium hydroxide.
Tungsten Powder Preparation
The hydrogen reduction or ammonium paratungstate of tungsten trioxide is what makes tungsten powder. Two stages are used to make tungsten powder. At 500 – 700, the tungsten dioxide is reduced into tungsten dioxide. At 700 -900 the second stage, which is at 700 900, is the final stage. Reduced tungsten to a powder. The reduction reaction can be carried out either in an electric tube furnace (or a rotary furnace).
Reduced tungsten powder has properties such as purity, composition and particle size. Most of the properties are affected by the process of reduction. Reduce tungsten powder using a tube furnace. The key process parameters that impact the reduction rate include the temperature, load of tungsten oxide, speed of burning, flow rate and hydrogen moisture. With increasing reduction temperatures, the size of the particles in tungsten powder gets smaller.
Other than the hydrogen reduction process, tungsten is also prepared using the tungstenoxide carbon reduction method. The reduction temperature is greater than 1050. It is possible to obtain a very low purity level of tungsten from this process. Additional research is underway on the combination of metal aluminum, magnesium, and zinc to lower tungsten dioxide. This work is still ongoing. Special applications, such as those that need tungsten clay with very fine particles, have been made possible by the use of the tungsten chlorine hydrogen reduction process. The particle size of the powder obtained can not exceed 0.05mm.
Tunsten Powder Applications
Most commonly, tungsten is used to produce cemented caride and ferro or tungsten. Combining tungsten powder and chromium, molybdenum or cobalt, it forms a wear-resistant and heat-resistant alloy that is useful in making tools, metal surface hardening material, combustion tubes, blades for gas turbines, and other devices. Tungsten powder, tantalum or niobium as well as molybdenum and molybdenum can be used. For a refractory mixture,
High-density tungsten-nickel-copper alloy is used as a radiation shield. Metal tungsten wires, rods, sheets, etc. They are used in the manufacture of parts for light bulbs and electronic tubes. You can make filters from tungsten powder.
For processing powder metallurgy and tungsten compounds, tungsten powder is the primary raw material. You can make tungsten powder into wires or rods. You can make tungsten mixtures from tungsten and other metals like tungsten-molybdenum alloy, tungsten rhenium, tungsten copper, or high-density, tungsten. The preparation of cemented carbide tools using tungsten-carbide powder, like turning tools, drill bits, and molds is another important function for tungsten.
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