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 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.




Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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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.



Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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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.



Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
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