The production methods of the pressed and sintered tungsten products are belonging to the field of manufacture of finished metallic powder. The use of high-temperature reduced tungsten powder. At  the room temperature, using a high voltage of 12-27 t / cm with a uniaxial bi  in a rigid mold, the tungsten powder is directly pressed into a density of more than 80 to 93% of the theoretical density products. The tungsten powder is protected by hydrogen for 2-4 hours at a temperature of 1350 ° C to 2000 ° C. And then they are forced cooling or slow cooling. We may get the dense metal products, which the dimensional change is not greater than that of the green sheets of 1/2000 .   The grinding  of the surface uses specialized the vacuum adsorption mold, so that the products  can achieve high accuracy and finish. This method not only can be used for the production of of pure tungsten semiconductor support material  but also can  be used for the production of tungsten composite products.




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Brief description of this technology:  
The present invention relates to the  method of a jewelry and products of tungsten-containing rings.This invention  includes the following steps:

               
Firstly, we should  provide a  kind of powder mixture. This kind  of powder mixture  should contain tungsten and one or more of the following substances: carbide, titanium carbide, chromium, nickel, molybdenum, vanadium carbide, and iron；

Secondly,  the powder mixture should be placed in a mold；

Thirdly,we can give a sufficient pressure and temperature to the powder mixture, so that we can get the products of solid jewelry.



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Brief description of this technology:  
The present invention relates to the method of containing iron or tungsten powder or the powder aggregation .This invenition includes  these following steps:


At the begining,  we can mix powder containing tungsten carbide at least one first powder level with powder containing the iron oxide or tungsten oxide-containing powder and  any kind of  iron powder of at least a second powder fraction mixed ( The weight of the first fraction is 50-90% of the weight of the mixture,the weight of the second fraction is 10-50% of the weight of the mixture.)

The heating step  is the second step. The mixture should be heated up to 400-1300 ° C. The perferred temperature of the mixture is 1000-1200 ℃. The present invention also relates to the iron powder, tungsten powder and power aggregates.



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Brief description of this technology:  
The present invention includes  a tungsten trioxide (WO ↓ [3]) nanosheet and  the method for tungsten trioxide nanosheet. The characteristics of tungsten trioxide (WO ↓ [3]) nanosheet in that  the tungsten trioxide (WO ↓ [3])  is monocrystalline monoclinic phase (JCPDS # 43-1035) and it  is fluffy floc,.The area of it is (100-800) nm × (100-800) nm, the thickness of    the apparent is  5-40nm, and the surface area of BET is up to 100 250 m ↑ [2] / g.  The preparation method: tungsten acid the base organic or inorganic layered hybrid micro / nanobelts (tube) for precursor oxidation by nitric acid to remove the organic precursor layer tungstate (WO ↓ [3] • H ↓ [2] O) nanosheet. The reaction temperature is about 15-50 ° C;  the reaction time is about  5-120h.The  resulting tungstic acid (WO ↓ [3] • H ↓ [2] O) nanosheet to 1-5 ° C / min. The heating rate was raised to 250-600 ° C, and then incubated for 1-5h, and finally natural cooling to room temperature and stripped of water of crystallization, and the tungsten trioxide nanosheet.


The  present invention has the simple  production process   and the scope of changes in operating parameters is changeable. This invention is also adaptable and has low equipment requirements,high repeatability, high efficiency and low cost.




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Brief description of this technology:  
The invention provides a method for  nano tungsten trioxide powder. That takes the industrial production of ammonium tungstate (NH4) 2WO4 solution as raw material and  adds the mass of ammonium salt and organic acids ,in which  the quality of ammonium salt is equivalent of 5% to 90%  of the ammonium tungstate and   the quality of organic acids  is equivalent  of10% to 85%  of the ammonium tungstate. And then  the solution was heated and stirred constantly.When the temperature was raised to 40 ° C to 90 ° C, we inject slowly strong acid and give a appropriate stirring .After these process , we will give a yellow tungstic acid gel. We shuold place tungstic acid gel  into  a stirring drier and fry them about 1 to 4 hours in  the temperature of  100℃-500 ℃ .Finally ,we  can get calcined products nanoscale of WO3.

The advantages of the present invention are: the reaction process is simple and easy to control, low cost.And also it is available to  raw materials and suitable for industrial production. The  products during intermediate reaction  are gases. These gases are volatile or labile substances.At the same time they can be used for recycling and  can avoid  environmental pollution.



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Brief description of this technology:
 This technology is based on copper, nickel, tungsten powder. This technology can be used to produce the tungsten alloy electrical components of high-current device switch appliances, which including trolley buses, subways, trains, electric cars, cranes, transformers and rectifier device, the material for car dealers use to contact a circuit breaker in low-voltage power, the electrode, resistance welding of the current lead. The materials of being used mainly are tungsten powder, copper powder and so on. Tungsten alloys and other electrical components should be are processing during electrical contacts and various forms of applying tungsten alloys. This production technology is used in the trial production of Belarus Metallurgical Institute of tungsten powder, so that we can avoid expensive costs of import.


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Brief description of this technology:
The present invention provides a high yield, and good high temperature properties and resistance to deformation tungsten halogen lamps making from tungsten wire. The recrystallized structure can be formed of a tungsten filament the good dovetail clinch structure.And aspect ratio is greater than 12, high in the high-temperature and high-lighted state of the high-temperature strength, high-temperature anti-sag properties, and good resistance to deformation.  In normal condition the non-lighted  also  has high temperature strength, good ductility, and  extend the cycle  life of the halogen lamps. This method improves  the  anti-sagging performance of halogen tungsten  in high temperature and boost the winding performance during the process of making lights. Refinement and uniform dispersion of the tungsten filament potassium bubble are the key technologies.  Taking A3 type  of ammonium paratungstate as raw materials, preparation program  adds the C type of tungsten powder and is different from the existing tungsten powder preparation process. By potassium bubbles highly dispersed and homogenized to design vertical melting sintered tungsten rod of high-temperature annealing, the primary recrystallization annealingf of  tungsten rod  can develop many innovative production processes.
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Brief description of this technology:
By supplying an oxidant constituted by sodium nitrate or sodium nitrite, the tungsten-containing material and an oxidant contact with each other in an oxygen-containing atmosphere. Furthermore they can continuously generate a reaction product,  so as to the method for sodium tungstate. This method  can be used  to collect tungsten and the apparatus of the preparation of sodium tungstate.


The invention also provides  a method of preparing an aqueous solution of sodium tungstate.  After placing  the reducing agent into a solution containing the above reaction product, the melt is dissolved in water.And this method is the good way to  collect the tungsten.



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This note provides a method to get nanoscale tungsten powder preparation by Spray drying - fluidized bed.It is also known as thermochemical method, injection conversion method. U.S.Ratgers University L.E.McCandlish and B.H.Kear invented spray dry - fluidized bed technology Nanometer WC powder, tungsten oxide powder deoxidation is only a part . This method is to use a spray drying technique to get the AMT powders ((NH4) 6 • H2W12O40 • 4H2O). In the appropriate atmosphere the AMT powders are thermally decomposed to obtain a tungsten oxide powder and finally deoxidation with hydrogen to obtain the nano metal tungsten powder.

Spray drying - fluidized bed has short process route and finish mass production of nano tungsten metal powder. But it still has a lot of difficulties and is in the trial stage.

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Brief description of this technology:
The use of membrane technology is a method of preparating high purity of raw materials ammonium metatungstate. The ammonium metatungstate raw materials are directly implemented by acid dissolution of the ammonium  and after the desalting and concentration step of the nanofiltration membrane, by evaporation of the crystal drying step,   Ammonium metatungstate products are produced. Compared with the modern techonology, the method of the present invention omits the roasting process,  and does not have to go back to the converter equipment. That can reduce the fixed investment and  production cost. At the same time this method may remove the ammonium metatungstate product generated after the reaction of the ammonium paratungstate with acid ammonium nitrate impurities, thus that can  improve the quality of products, reduce the multiple aging use , to the disadvantage of low yield of pure ammonium metatungstate by suction filter natural filtering methods, improve product recovery. The method of preparation of ammonium metatungstate product has  good fluidity, good solubility, high purity, high recovery rate. That also can  overcome the shortcominmgs of  existing technical ammonium metatungstate low solubility products,  product quality and the recovery rate.

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