Molybdenum trisulfide precipitation method uses the affinity of molybdenum in solution which is bigger than tungsten, the principle is disparity of affinity toward sulfide between tungsten and molybdenum.
Violet tungsten oxide powder may be applied in window heat insulation film so that such film will has high heat insulation and high transmittance and be applied in buildings and cars. In recent years, submicron cemented carbide and ultrafine cemented carbide have received increasing attention due to their high toughness, high wear resistance and good high temperature strength. And their demand and application fields are expanding. In order to produce an ultrafine alloy with excellent properties, submicron tungsten carbide powder…
Violet tungsten oxide powder may be applied for producing thermal insulating glass, such as building, car, cruise, aircraft, and the like. The quality of the violet tungsten oxide was initially determined in accordance with the blue tungsten oxide and yellow tungsten oxide projects, except for the oxygen index, the specific surface, and the pseudo-specific gravity. Later, the researchers proposed to use phase composition or scanning electron microscopy to detect and control, that is, WO2.72 phase is greater than or equal…
Violet tungsten oxide powder may be applied for producing heat insulation coating. And this type of thermal insulation coating has been gradually applied to places requiring high heat insulation and high visible light transmittance such as buildings and automobiles. Ultrafine tungsten powder and ultrafine tungsten carbide powder can be obtained by using violet tungsten oxide, yellow tungsten oxide and blue tungsten oxide as raw materials separately (under the same hydrogen reduction and carbonization process conditions). Tungsten oxides including violet tungsten…
Violet tungsten oxide powder may be used for the preparation of thermal insulation coating. And the application of violet tungsten oxide in the field of thermal insulation has been gradually promoted as it has the characteristics of environmental protection, high heat insulation performance and high visible light transmittance performance. The violet tungsten oxide is a raw material suitable for preparing ultrafine crystal cemented carbide, as the tungsten powder obtained by the hydrogen reduction of violet tungsten oxide is fine and…
Violet tungsten oxide powder may be used to prepare near-infrared shielding material (heat insulating material), which has been gradually applied to the heat insulation fields of building and automobile. The violet tungsten oxide has unique fine needle-like crystal morphology, and its polymer resembles a loose sponge. Compared with yellow tungsten oxide (YTO) and blue tungsten oxide (BTO), the bulk density of violet tungsten oxide is much smaller than that of YTO and BTO. The BET of violet tungsten oxide is…
Violet tungsten oxide powder may be used to produce thermal insulation paper with high transparency so that it can be applied to fields such as building energy-saving films and car films. Compared with tungsten oxide products such as yellow tungsten oxide, blue tungsten oxide and ammonium tungsten bronze, violet tungsten oxide has the most special morphology. Each particle of violet tungsten oxide is a loose particle group composed of needle-like or rod-shaped crystal grains. The particle structure has a large…
Violet tungsten oxide powder may be applied for producing thermal insulation film, and therefore be widely used in the fields of heat insulation such as building glass and automobile glass. The appearance of violet tungsten oxide is generally light violet or blue violet. The main components and physical properties of violet tungsten oxide are as follows: W18O49 content is more than 97%, oxygen index is less than or equal to 2.72, specific surface is 1.5~3.0m2/g, and bulk density is 1.9~2.3g/cm3.…
Violet tungsten oxide powder may be used to prepare ceramic microsphere. And violet tungsten oxide may be produced by calcining ammonium paratungstate (APT) under a mild reducing atmosphere. In this process, what effects do the furnace temperature, feed amount and furnace speed have on the preparation of violet tungsten oxide? Other process conditions unchanged, the morphology of violet tungsten oxide appears as a needle-like crystal form if the furnace temperature is too low; the morphology of violet tungsten oxide appears…
Violet tungsten oxide powder may be applied for the production of thermal insulation masterbatch. Such masterbatch may be applied to producing thermal insulating film with the characteristics of high transparency, high heat insulation and excellent weather resistance so that it can be used in the heat insulation fields of construction and automotive. The preparation of violet tungsten oxide is generally using ammonium paratungstate (APT) as raw material, and is reduced in an industrial rotary tube furnace under certain conditions, such…