Method for Preparing Refractory Foam Metal Tungsten
- Details
- Category: Tungsten Patents
- Published on Tuesday, 09 December 2014 09:09
- Written by Sherry
- Hits: 2257
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.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Tungsten News & Tungsten Prices, WML Version: http://m.chinatungsten.com
The above is reproduced from: Application Technology Network, if in doubt, please contact the content belongs website.
Preparation Method of Nano Yttrium Oxide Dispersion Strengthening Tungsten Alloy
- Details
- Category: Tungsten Patents
- Published on Monday, 08 December 2014 09:34
- Written by Sherry
- Hits: 2400
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.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Tungsten News & Tungsten Prices, WML Version: http://m.chinatungsten.com
The above is reproduced from: Application Technology Network, if in doubt, please contact the content belongs website.
Highly Acidic Composition Containing Zirconium Oxide, Titanium Oxide and Tungsten Oxide, Method for Preparing the Same and Use Thereof in the Treatment of Exhaust Gases
- Details
- Category: Tungsten Patents
- Published on Thursday, 04 December 2014 09:00
- Written by Sherry
- Hits: 2379
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.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Tungsten News & Tungsten Prices, WML Version: http://m.chinatungsten.com
The above is reproduced from: Application Technology Network, if in doubt, please contact the content belongs website.
Preparation Method of Nano Tungsten Powder
- Details
- Category: Tungsten Patents
- Published on Friday, 05 December 2014 08:59
- Written by Sherry
- Hits: 2326
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.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Tungsten News & Tungsten Prices, WML Version: http://m.chinatungsten.com
The above is reproduced from: Application Technology Network, if in doubt, please contact the content belongs website.
Method for Determination of Molybdenum Trioxide and/or Tungsten Trioxide Content of High-molybdenum Tungsten Ore
- Details
- Category: Tungsten Patents
- Published on Wednesday, 03 December 2014 09:21
- Written by Sherry
- Hits: 2461
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.
Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Tungsten News & Tungsten Prices, WML Version: http://m.chinatungsten.com
The above is reproduced from: Application Technology Network, if in doubt, please contact the content belongs website.
More Articles...
- Tungsten Oxides Used to Increase The Heat-input Amount of Near Infrared Radiation
- Method and Apparatus for Preparing Blue Tungsten Oxide by Ammonium Paratungstate Self-reduction
- Tungsten Oxide Material With Nano Band Array Structure and Preparing Method
- Method for Synthesizing Quadrangle Tungsten Oxide Nano-powder
sales@chinatungsten.com
闽公网安备 35020602000140号