The present invention provides a system to take technology with molten salt electrolysis method of fine tungsten powder. Specific steps are as follows:

1) electrolyte composition of basic parts by weight KCl electrolyte NaCl 20-80 parts complement to 100 copies; according to the aforementioned proportion of the NaCl, KCl mixture of 50-85 parts Na2WO4 8-40 copies of WO3 3-8 copies LiCl 0-40 copies CaCl2 0 10 parts MgCl2 0-10 copies;

2) according to changes in the temperature of the electrolysis of the electrolyte components, adapted to take the temperature of a temperature range of 560-750 ℃;

3) a cathode current density of the cathode current density 0.15-1.2A/cm2;

4) a cathode material of the cathode material can be selected as iron, iron alloy, tungsten, tungsten alloy, except for any one of a conductive carbonaceous properties of composite materials;

5) anode materials can be selected and an anode material of inert metal materials carbonaceous material.
 

1) The electroforming process uses a DC power supply voltage: 3 V to 15 V, current density: 1 ~ 12A/dm2, the anode and the cathode are inserted in the electroforming solution, pure nickel is an anode, while a cathode is stainless steel or Ti ;

2) The composition of the electroforming solution of nickel sulfamate: 120 to 350 g / l, nickel chloride: 20 ~ 45 g / l, sodium tungstate: 480 ~ 1400 g / l, boric acid: 10 ~ 50 g / l . In the electroforming process, we should stire, the stirring speed: 60 to 130 rev / min;

3) Electroforming process performed at a constant temperature is 550C, then the filtration residue, electroforming process control time: 1 hour to 12 hours.

Advantage of the present invention is that: the Ni atom, and W atoms in each electric crystal grains was occupied by each gap arrangement, succeeded in preparing high density tungsten-nickel alloy block.

 

The present invention describes a tungsten alloy composite coating materials. Characterized in that:

1) tungsten alloy composite coating material is made of tungsten alloy and a large number of dispersed multiphase composite structural material of tungsten alloy particles or fibers;

2) a tungsten alloy composite coating weight percent tungsten in the range of 5 to 98%, the weight percentage of particles or fibers in the range of 0.05 to 80%, particle size of 3 nm to 5 microns range of fiber diameter in the range of 3 nm to 5 microns.

3) The low stress coating has excellent temperature and high-temperature hardness and wear resistance, excellent high temperature oxidation resistance, excellent resistance to corrosion.

4) tungsten alloy composite coating has an important purpose in the machinery industry, chemical and pharmaceutical industry, metallurgical industry, aerospace, weapons and ammunition, oil exploration, mining industry, the electronics industry, particularly suitable for applications requiring high temperature strength and corrosion resistance of occasions.

 

The present invention provides a process for preparing nano-nano WC and PTFE bath brush. Characterized in that:

1) selection of raw materials: nano size were selected 80-100nm particles of tungsten carbide WC 3g / L; size 30-60nm nanoparticles polytetrafluoroethylene PTFE particles 5g / L;

2) mixing: The above raw materials into 20ml / L of acetone were mixed wet, and added to a 1L ordinary express all the nickel plating bath brush, adding 0.1g / L of Tween 40 dispersing agent;

3) magnetic stirring: the first bath and the resulting mixture magnetically stirred 30min;

4) ultrasonic oscillations: ultrasonic oscillation 60min;

5) derived products: tungsten carbide nano and nano obtain teflon brush bath.

Compared with the prior art, the invention may be formulated process is simple, nano and nano-tungsten carbide dispersed uniformly suspended PTFE composite plating solution, nanocomposite coatings to meet process requirements.

 

The present invention provides a nano tungsten - nickel composite coating preparation, plating technology in the field is interdisciplinary and nano materials. Characterized in that:

1) The coating consists of a matrix consisting of nickel and firmly embedded in one of the nano-tungsten carbide particles;

2) The plating solution is: NiSO4.7H2O :130-200 g / l, NiCl2: 30 ~ 50 g / l, tungsten carbide nano :30-80 g / l, CoSO4: 2 ~ 10 g / l, H3BO3: 30 - 50 g / l saccharin 3-5 g / l, FK-370, low foam wetting agent, 2-5 g / l, FK-287A Main optical agent 1-3 g / l, FK-287B adjuvants: 2-4 g / l, FK-287C stabilizer :10-20 g / liter;

3) Plating process conditions: CoSO4 agent to promote coprecipitation of 2 to 10 g / l; 60 to 90 rev / min speed intermittent stirring;

4) Temperature of the plating solution 25-35 ℃; cathode current density of 15-25 On / dm2; pH of the plating solution is 3 to 5;

5) Anode area ratio of 2:3.

The present invention provides nano WC - Preparation of nickel composite coatings with low cost, high utilization of nano-powders, nano-tungsten carbide powder does not decay in the preparation and processing of nano-powders, etc. without prior reunion.

 

This invention describes a kind of mixer which  is used for  tungsten carbide powder preparation. It is characterized as follow:

The present invention relates to new tungsten carbides which are doped with fluorine in an amount of up to 0.5 wt % and which can also be doped with fluorocarbon compositions.

These tungsten carbides are produced according to a new CVD method in which the phase contains tungsten hexafluoride, hydrogen and a carbon-containing gas. This method is characterised in that the carbon-containing gas is previously thermally activated. 

The tungsten carbide coatings can be applied onto construction material and articles made therefrom. These coatings exhibit a high wear and corrosion resistance as well as a high chemical stability.

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This invention provides a method of nanoscale tungsten powder preparation by using high-energy ball milling. The high-energy ball milling method  is used at a lower temperature and protective atmosphere. By using of rotation or oscillation of the ball mill,  the hard ball takes a  strong impact on the raw materials,which may be grinding and stirring.After that smash the metal into nanoscale particles. Currently, high-energy ball milling  takes full use of a vibrating ball mill, planetary ball and grinding ball mill to prepare nanopowder.
 
The high-energy ball milling is an important method for the preparation of nano-powder materials. This method has following advantages: high output, ordinary process equipments  small size of  powder grain. This  technology has  a broad application prospects in recent years  and has received materials scientists'  attentions.

The shortcomings of this invention is that impurities contaminates tungsten powder during the milling process and the resulting powder is easily reunion and not easily dispersed with high energy consumption. Thus this method is more suitable for purity powder preparation with  less demanding .



Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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The powder metallurgy tungsten contact belongs to the field of automotive electrical components. The method for  exisiting tungsten contact is using tungsten blanks hanging melting sintered, swaged into rods, and then cut into pieces. 

The disadvantages: a long process, which normally takes 20 procedures, easily oxidized .When occuring  the material transfer,it is often polished.

The advantages: the process is simple, just  only five steps.By adding other ingredients, improve the antioxidant properties of the product and  prevent the substances transfer occuring  when the use of tungsten contacts, with an average life is  41,300 km / Vice contact. so the present invention of  tungsten contacts can be widely used in the automotive electrical appliances and other electrical instruments.



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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 By using three columns in series on exchange in addition to black-and-white the tungsten mineral or high molybdenum fine mud, so that we can cost lower for high purity ammonium paratungstate. This method for high purity ammonium paratungstate by using high molybdenum tungsten ore includes these six steps:

(1）the tungsten the ore or tungsten fine mud ball, alkali cooking leaching, filtered, and concentrated sodium tungstate crystals;

(2) water-soluble sodium tungstate was filtered, vulcanization;

(3) ion exchange and eliminate molybdenum;

(4)The solution after addition of the sodium tungstate eliminates sulfur;

(5)ion exchange removing impurities, the desorption of ammonia and ammonium chloride solution was prepared by tungsten, ammonium tungstate solution;

(6) after evaporation and crystallization, it will be ammonium paratungstate.

The effect of technological progress of the invention is in black and white mixed tungsten ore lower the price  of 1500-2000 yuan / ton than wolframite, while tungsten fine mud  is much lower than them,which is about 5000-7000 yuan / ton, the economic benefit is obvious. if it is used to handle the  tungsten fine mud , the economic benefits is much better. The invention provides a new state-of-the-art smelting apporach for  the large number of black and white mixed tungsten ore  and the tungsten fine mud.



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
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