The invention discloses a method for preparing refractory foam metal tungsten, and belongs to the technical field of preparation of porous high temperature alloys.

The method comprises the following steps: firstly, synthesizing and preparing a tungsten oxide precursor by a solution method; secondly, selectively reducing the tungsten oxide precursor in hydrogen to obtain metal foam tungsten with nanoscale crystal grains; thirdly sintering the obtained metal foam tungsten in hydrogen at different temperatures; and finally, obtaining metal foam tungsten with different porosities, pore diameters, particle sizes and strengths.

By the method, the problem of obtaining superhigh porosity of refractory metal is solved; and the refractory foam metal tungsten has the advantages of strong designability of the porosity and the pore diameter, low cost, high utilization rate of a powdery raw material, high strength at high temperature, applicability to high-temperature-resistant, corrosion-resistant and oxidation-resistant conditions, and the like.


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The invention provides a preparation method of a nano yttrium oxide dispersion strengthening tungsten alloy and belongs to the field of the manufacturing of powder used for powder metallurgy.

The preparation method mainly comprises the following steps of: dissolving yttrium nitrite (Y(NO3)3.6H2O) in ethyl alcohol, and carrying out ball milling and mixing on yttrium nitrite and ammonium paratungstate (APT); after wet powder is dried by distillation, calcining for 20-150 minutes at the temperature of 400-900 DEG C to obtain nano yttrium oxide dispersion strengthening tungsten powder; then reducing by H2 for 30-150 minutes at the temperature of 600-1000 DEG C to prepare the nano yttrium oxide dispersion strengthening tungsten powder; and mixing 0.1-1% of Ni as an activated sintering agent, and carrying out compression moulding and H2 gas shield sintering or vacuum or HIP (hot isostatic pressing) sintering, so that the nano yttrium oxide dispersion strengthening tungsten alloy can be prepared.

The preparation method provided by the invention has the advantages that the density can be 18.28-19.2g/cm<3>, and a yttrium oxide dispersed phase is fine and is uniformly distributed in tungsten crystal particles.




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A preparation method of nano tungsten powder comprises the following steps: (1) dissolving ammonium metatungstate, chromium nitrate and a water-soluble carbon source substance into in heated deionized water, electrically stirring to sufficiently mix raw materials, and after uniformly mixing the raw materials, performing spray drying to obtain precursor powder, wherein the weight percentage of the water-soluble carbon source substance is 10-30%, the weight percentage of the chromium nitrate is 0.5-2% and the temperature of the deionized water is 70 DEG C; and (2) putting the precursor powder obtained in the step (1) into a tubular atmosphere furnace, performing auxiliary hydrogen reduction, and before discharging the powder out of a furnace, passivating the powder with an inert gas, wherein the temperature is 710-850 DEG C, the heating rate is 10-15 DEG C/ min and the reaction time is 2-5h.

The particle size of the prepared tungsten carbide is 40-70nm; after the prepared tungsten carbide is crushed, agglomeration-free nano tungsten powder can be obtained; the environment is polluted; and the development of a nanocrystalline WC-Co hard alloy can be effectively promoted.




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The invention relates to a composition containing zirconium, titanium and tungsten oxides, and optionally the oxide of an element M selected from silicon, aluminium, iron, molybdenum, manganese, zinc, tin, and rare earths in the following mass proportions of said different elements: titanium oxide: 20%-50%; tungsten oxide: 1%-20%, M-element oxide: 1%-20%; the balance consisting of zirconium oxide.

The composition is obtained by: placing in a liquid medium a zirconium compound, a titanium compound, optionally an M-element compound and a basic compound; adding a tungsten compound to the precipitate suspension thus obtained and having a pH value of between 1 and 7; maturing the suspension resulting from the preceding step; and optionally separating the precipitate and calcining it.


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The invention discloses a method for determination of molybdenum trioxide and/or tungsten trioxide content of high-molybdenum tungsten ore.

The method comprises the following steps of 1, dissolving a sample by hydrochloric acid, nitric acid and perchloric acid in the presence of a small amount of ammonium fluoride so that tungsten is separated out in a form of tungstic acid and a part of molybdenum is separated out in a form of molybdic acid, 2, carrying out filtration so that tungsten and molybdenum are separated from a large proportion of coexistence elements, dissolving the tungstic acid and the molybdic acid by ammonia water, carrying out drying and calcination of the filtrate, removing silicon by hydrofluoric acid, carrying out calcination, and weighing the total amount of tungsten trioxide and molybdenum trioxide, 3, dissolving tungsten trioxide and molybdenum trioxide by sodium hydroxide, determining the amount of molybdenum trioxide by a thiocyanate absorption photometry method, and 4, determining mass fractions of tungsten trioxide in the residues and the filtrate by the thiocyanate absorption photometry method, and carrying out result correction.

The method solves the problem that because of molybdenum influence, the conventional tungsten trioxide analysis method produces content determination values higher or lower an actual value and is unstable. The method is simple and feasible and realizes accurate and stable analysis and detection of molybdenum trioxide and/or tungsten trioxide content of high-molybdenum tungsten ore.




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The invention relates to the use of tungsten oxide or of tungstate to increase the heat-input amount of near infrared radiation in processes selected from laser welding of plastics, NIR curing of coatings, drying of printing inks, fixing of ink toners to a substrate, heating of plastic preforms, laser marking of plastics or paper.

List of formula ^ use of tungsten oxide, wherein W is tungsten, O is oxygen, X is O. I to 1, and a salt of tungstic acid or formula MxWyOz use /, where M is one or more selected from cis-4, H, Li, Na, K, Rb, Cs, Ca, Ba, Sr, Fe, Sn, Mo, Nb, Ta, Ni, Pd, Pt, Cu, Ag, Au, Zn, Cd, Al, Ga , In, Tl elements, W is tungsten, O is oxygen, O. 001 San x / y San I and 2. O <z / y ^ 3. 0, for drying printing ink or ink toner Fixed improve near-infrared heat input in the process of shooting a blessing on the substrate.




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The present invention discloses a method and a device for the preparation of the self-reducible paratungstate blue tungsten oxide, ammonium paratungstate which is 5 (NH.

A method paratungstate since reducing preparation blue tungsten oxide, which is based paratungstate 5 (NH4) 2O · 12WO3 · 5H2O as raw material, characterized in that: it comprises the following steps:. A will paratungstate 5 (NH4) 2O · 12WO3 · 5H2O thermally decomposed into tungsten trioxide WO3, ammonia NH3 and water vapor H2O; paratungstate said heating temperature is 400 ℃ ~ 600 ℃;. b using the tungsten oxide WOX good properties of ammonia NH3 decomposition catalyst, and said control of the reaction; the heat decomposition of the ammonia NH3 is further decomposed into nitrogen N2 and hydrogen H2;. c by controlling the reaction temperature and the gas pressure of the furnace proper, the reduction of tungsten trioxide WO3 tungsten oxide blue WO2.9 temperature is set to 550 ℃ ~ 800 ℃; furnace gas pressure in the range of 0 to 2 mbar.




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Nanotechnology in having a tungsten oxide material and method nanoribbons array structure, characteristics: tungsten oxide nanomaterials exhibit highly ordered nanostructures ribbon, a single tungsten oxide nanobelts length 0.5-5μm, width for 100-400nm, the thickness of 10-50nm; tungsten oxide nanoribbons directly generate parallel and perpendicular to the metal tungsten substrate orientation.

Preparation steps: tungsten metal or tungsten as the reaction substrate sheet, heating the ends of the base are connected to the positive and negative power supply, the metal tungsten matrix placed in a closed reaction chamber; the vacuum pumping to the 3000 ~ 5000Pa, open the heating power, control the substrate temperature between 500 ~ 1100 ℃, reaction 5 ~ 30min off the heating power; unchanged to maintain the vacuum degree was allowed to cool to room temperature. Advantages: tungsten oxide material and the substrate with a solid; and render highly ordered nano-ribbon array structure; an array of large specific surface area, nano-size effect significantly; Preparation is simple, without pre-matrix processing and xenobiotics involved in the reaction, the process one step .


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The invention relates to a preparation method of square tungsten oxide nano powder, belonging to the field of inorganic non-metallic materials.

The content thereof is as follows: tungstenic acid deposition obtained by the reaction of sodium tungstate and hydrochloric acid is used as a precursor, citric acid is used as an auxiliary reagent, hydrochloric acid is used to adjust pH value and nano tungsten oxide is grown in a high-pressure autoclave by heating. Heating mode can be microwave heating and resistance wire heating, and the nanocrystalline grown is square. The characteristic of the square tungsten oxide powder material is that: the size of the square tungsten oxide is between 80 and 150nm.

The advantages of the method are that: the process is simple, the cost is low and the shape and size of the tungsten oxide crystal are hydrothermally controlled by the citric acid auxiliary.


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The invention provides a preparing method of a porous tungsten oxide film, which is characterized in that the preparing method comprises the following steps: adopting a tungsten-target and aluminum-target magnetic control co-sputtering technology to deposit tungsten and aluminum on a substrate to form an aluminum alloy film; dipping the obtained tungsten-aluminum alloy film into alkaline solutionfor selective corrosion and oxidation; and finally, obtaining the porous tungsten oxide film on the substrate.

The porous tungsten oxide film prepared with the method has even aperture distribution, and the average aperture size is about 100nm. The invention has the following obvious advancement and originality of simple preparation, easy control of technological parameters, controllable porosityand aperture size and even aperture distribution.

The product structure and the property thereof are very suitable for manufacturing electrochromic devices and air-sensitive devices.


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