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Medium Blue Tungsten Oxide 170

Medium blue tungsten oxide may be used to produce metal tungsten (W) powder. The blue tungsten oxide (BTO) may be made into W powder by reduction method. Certainly, BTO may also be obtained by reducing yellow tungsten oxide. There are four methods for reducing W powder with industrial value: carbon reduction method, carbon-containing gas reduction method, decomposition ammonia reduction method, and hydrogen reduction method. Among them, the most widely used method is hydrogen reduction method. The W powder obtained by…

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Coarse Blue Tungsten Oxide 165

Coarse blue tungsten oxide’s main raw material is ammonium paratungstate (APT). APT is a white crystal. The production process of ammonium paratungstate varies. It depends on the type of tungsten concentrate used and the impurity contained. Several Kinds of Production Processes of Ammonium Paratungstate 1. Soda boiling black tungsten concentrate (caustic soda) at high pressure – ion exchange – evaporation crystallization; 2. Soda boiling black tungsten concentrate (caustic soda) at high pressure – solvent extraction – evaporation crystallization; 3. Pressure…

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Fine Blue Tungsten Oxide 179

Fine blue tungsten oxide is a blue powder with the grain size of 7~12μm. Basic Measurement Principle of Oxygen Index in Blue Tungsten Oxide The oxygen index is used to characterize the change of the number of oxygen atoms in blue tungsten oxide (BTO), that is, to reflect whether the content of tungsten contained in BTO powder is high or low. The larger the value, the lower the content of tungsten in blue tungsten oxide, and vice versa. The determination…

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99.5% Yellow Tungsten Oxide 332

99.5% yellow tungsten oxide is a yellow powder with high purity. The determination process of Si in the yellow tungsten oxide is available by silicon molybdenum blue spectrophotometry method, which is easy to operate by dissolving yellow tungsten oxide with NaOH solution and complexing tungsten with citric acid. The measurement range of ωSi is from 0.0004% to 0.016%, the recovery rate is at the range of 95.71%~118%, and the relative standard deviation is less than 14.32%. Silicon Molybdenum Blue Spectrophotometry…

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99.95% Yellow Tungsten Oxide 316

99.95% yellow tungsten oxide may be applied to produce fireproof fabric. Fireproof fabric is designed to resist burning and withstand heat. And it can not only effectively prevent the spread of flame, but also can protect the original performance of the fabric products. Therefore, it is usually used in special industries for special types of protective fabrics. Studies have found a flame retardant and heat resistant nano magnesium oxide doped polyvinyl dc cable materials, by adding nano tungsten trioxide to…

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99.9% Yellow Tungsten Oxide 361

99.9% yellow tungsten oxide, or 3N yellow tungsten oxide, is a kind of yellow powder with relative high purity. Spray Pyrolysis Method to Produce Nano Yellow Tungsten Oxide By dissolving tungstic acid (H2WO4) in alkali solution containing ammonia under a certain ratio, by ultrasound spray conversion and vacuum drying to get nano YTO powder. Actually, this method is an aerosol process which belongs to vapor phase method. But it uses liquid phase as precursor. Therefore, it has the advantages of…

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99.99% Yellow Tungsten Oxide 384

99.99% yellow tungsten oxide may be produced by microemulsion method. This method adopts ammonium tungstate solution as raw material. The processes are shown as follows: 1. Add the ammonium tungstate solution into emulsion with surfactant. 2. After super-emulsifying, add in strong acid such as hydrochloric acid (HCL) and sulfate (H2SO4) to react and precipitate. 3. After centrifugal precipitants, clean the precipitants with solvent. 4. Dry to get yellow tungsten oxide. In microemulsion method, surfactant and co-surfactant is composed of a…

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Tungsten Alloy Block 421

The shape of the tungsten alloy block is square, rectangular or other shapes. It can be used as a substitute for nickel, titanium, and lead, as well as weapon parts and weights. It is also the best raw material for making molds. Characteristic Tungsten alloy block has good conductivity and thermal conductivity, density is 16~18.5g/cm3 and higher than that of nickel, titanium and lead. It has good mechanical strength, low thermal expansion coefficient and high elastic modulus. Applications Tungsten alloy…

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Tungsten Alloy Sintered 322

Tungsten alloy sintered is semi-finished products and is used as raw materials for subsequent processing. It has excellent physical properties and performance, which can be used as semi-finished products and precision-machined parts. Manufacturing processes Metal powder mixing: mixing tungsten powder with nickel, copper, iron and other metal powders; Vacuum drying: these powders are dried under vacuum; Pressing: pressing the main use of molded hair. Applications Tungsten alloy sintered can be used either as semi-finished or precision machined parts. If the…

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Tungsten Alloy Finished Parts 314

Tungsten alloy finished parts have a series of excellent properties such as high density, high melting point, good corrosion resistance and good wear resistance. They are made of high density tungsten carbides. Chinatungsten Online provides high quality tungsten alloy finished parts. Tungsten alloy finished parts are made of high density tungsten carbides. High density tungsten alloys have many advantages and are a special alloy with high density, processability, corrosion resistance and environmental protection. Tungsten alloys have high melting point characteristics.…

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