The present invention provides a method for treating tungsten carbide particles. Steps are as follows:

1) Provide W-C-containing particles of tungsten carbide-based material, its composition, microstructure and phase distribution is shown on the phase diagram, the phase diagram shows that a single-phase γ region having a face-centered cubic structure, the single-phase region upwards from the liquid phase line at the junction, and select the carbon content of the particles so that the thermal path through the single-phase region;

2) In the single-phase region of said raw material to homogenizing treatment, thereby obtaining a single-phase particles having a face-centered cubic structure;

3) Hardened tungsten carbide, the single-phase single-phase structure of the particles remain at room temperature.




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The invention discloses a tungsten-molybdenum-aluminum alloy powder, which was expressed as W [1-x-y] Al [x] Mo ↓ [y], where: x = 0.01-0.86, y = 0.01 -0.98. Steps are as follows:

1) Tungsten powder, molybdenum powder, aluminum powder and three metal powder or tungsten and molybdenum alloy powder and aluminum powder as raw material, adding mill pot, ball feed ratio of 25:1-50:1, sealed under argon, synthesis time 30-160 hours to obtain aluminum, molybdenum, tungsten alloy powder; zhibei

2) Tungsten powder, molybdenum powder and an aluminum alloy as raw material, a ball mill jar, the ball feed ratio of 25:1-50:1, sealed under argon, the synthesis time is 30-160 hours, the obtained product was placed in a vacuum carbon tube furnace, 1200-1400 ℃ for 5 to 10 hours to obtain aluminum, molybdenum, tungsten alloy powder.

The present invention can be divided into several aluminum ball mill jar was added.




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The present invention provides a process for preparing tungsten silver or tungsten copper alloy composites. Steps are as follows:

1) Selecting 10 ~ 500um diameter tungsten material, pickling, cleaning;

2) According to the conditions required size, cut tungsten material;

3) The copper or silver wound is tightly around the tungsten, copper or silver in the diameter determined by the ratio of tungsten copper tungsten silver or composite materials;

4) Tied a copper or silver wound tungsten rod  into its peripheral diameter of 0.5 ~ 5cm; e. The rod-like material after the binder is placed in a vertical vacuum sintering furnace melt infiltration; copper or silver bullion ingot placed on top of the rod after the tying material, the infiltration temperature is above the melting point of copper or silver, the temperature holding time of 0.25 to 2 hours;

5) With the furnace cooling to room temperature, it is made of tungsten or tungsten silver-copper alloy composite cathode rod after removed;

6) Machining the above-mentioned composite cathode bar, that is the composite material obtained in the desired element.

Obtained by this method tungsten or tungsten silver-copper alloy composite material with high density and electrical conductivity, and oxygen content, nitrogen content and inclusions are very low, especially for the cathode as in the field of high-voltage electrical appliances, etc. materials.




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The present invention describes a tungsten chromium - copper composite material. Characterized in that:

Percentage by weight of the composition comprises the following components: from 32% to 50% tungsten, 11% to 23% chromium, 27% ​​-57% of copper, the sum of the components is 100% by weight.

Preparation steps are as follows:

The tungsten powder and chromium powder mixing, granulating, pressed into billets, and then by sintering copper liquid infiltration, after homogenization treatment and aging treatment system. The compositions especially as 110kV high-voltage vacuum circuit breaker above the contact material, its dense, with good conductivity, moderate hardness, low gas content, the lower closure value, excellent performance and arc burning welding resistance.




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The present invention describes a copper - tungsten - carbon - titanium - rare earth alloy material, the copper - tungsten - carbon - titanium - rare earth alloy materials by Cu, WC, C, Ti, rare earth elements, and each substance mass percentage content follows: WC5-20%, C1.0-4%, Ti0.8-2.5%, 0.1-1.2%, rare earths, and the balance Cu. Characterized in that:

1) The alloy material is a metal - carbide series based on the development of a new successful electrical contact materials, which reduces the content of WC, increases the weight percentage of Cu with good conductive properties, to improve the material's electrical conductivity, reduced the effect of resistivity, effective control of the material technical problems in the use of temperature rise, the heat burning the contacts;

2) While adding a small amount of an appropriate amount of C and Ti, rare earth elements, to further improve the welding resistance, electrical wear resistance and overall performance of electric arc, the electrical life of other materials;

3) In particular, the use of advanced mechanical alloying production process, replacing the traditional mix powder metallurgy method to improve the degree of fine material internal organizational structure, so that the scope of application of the material switches from a particular large current appliances, circuit breakers use extended to most moderate current series of switches, circuit breakers can be used.

4) Especially in the silver section, there is a significant effect on saving silver, low cost advantages as well, so it  has a  market prospect.




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The present invention provides a nanoscale tungsten-cobalt mixed powder production process. Steps are as follows:

1) Preparing a certain concentration of ammonium metatungstate solution, adding a certain amount of cobalt carbonate powder, heating and stirring, followed by sufficient reaction, the resulting complex salt solution was cooled and filtered;

2) Dry tungsten-cobalt composite salt solution to obtain tungsten-cobalt composite salt powder;

3) Heating the powder and tungsten-cobalt complex salt introduced into N2, the composite powder of the salt is decomposed and stripped of water of crystallization;

4) Then pass into N2, CH4 mixed gas tungsten carbide-cobalt composite salt products are free of carbon CO2, N2 mixed gas removal, and then get the nanoscale WC-Co composite powder.


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The present invention provides a fine-grain tungsten - copper composite material preparation methods, which consists of W-Cu powder mixture, and then by high-energy ball milling, and add the liquid medium and the surface active agent, and then dried to obtain nano-W-Cu composite powder, followed by solid-phase sintering into high-density alloy. Steps are as follows:

① Alloy composition is: (100-χ) W-χCu, χ is 5-50%, the main component of W;

② The W and Cu of the two powders was mixed for 12 hours to obtain W-Cu mixed powder;

③ The mixed powder was put into the high-energy ball milling drum, add balls or tungsten carbide balls, the ball 5/1 - feed ratio of 20:1, the medium was added in the ratio of 0.8 to 2.0, the liquid milling medium, was added 1-5wt% surfactant high energy ball milling, vacuum reached 1 × 10-2MPa, passed through a protective atmosphere (N2, Ar, etc.), the milling time of 5-60 hours, to obtain a powder of liquid;

④ The powder liquid is dried to obtain the grain size of 20-50nm, ultrafine particle size of W-Cu composite powder of nanocrystalline structure 0.2-0.5μm;

⑤ The complex nanocrystalline W-Cu powder forming complex body under the pressure of 200 ~ 500MPa;

⑥ The green compacts were sintered into a sintering furnace, pass into the atmosphere H ↓ [2] or the decomposition of ammonia or vacuum; at 5 ℃ / min-20 ℃ / min heating rate of rise 400 ℃ -700 ℃, incubated 5min -120min then at 20 ℃ / min-60 ℃ / min to the sintering temperature rise rate of 1150 ℃ -1350 ℃, incubated 30min-120min, to obtain density of 97-99.5%, W grains 1-2μm, tensile strength of the W-Cu alloy 700-800MPa.


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The present invention provides a method for preparing a high dispersion of tungsten-copper composite powders. Characterized in that: The present invention includes the preparation of tungsten-copper composite oxide precursor, high-energy ball milling a total reduction of oxide powders sintered tungsten-copper composite powder and other steps. Specific steps are as follows;

1) Preparation of W-Cu composite oxide precursor, tungsten powder and copper powder in accordance with the W-2-30Cuw t% in the blender mixed oxide at 650 ℃ -700 ℃ horse charge air atmosphere furnace, obtain a mixture of CuWO4 and WO3 composed of mixed powder after oxidation in high-energy ball milling 0-12h in;

2) Total energy ball milling oxide powder after reduction in H2 atmosphere milled powders reduction, reduction temperature of 650 ℃ -750 ℃;

3) After the sintered tungsten-copper composite powder reduced powder was pressed too 50% -55% relative density of compacts sintered at 1150 ℃ -1600 ℃.


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The present invention provides a method for preparing a carbon-vacancy-type aluminum solid solution of tungsten carbide powder. Specific steps are as follows:

1) The W [0.50] Al [0.50] as a reaction precursor binary alloys with particle size less than 300 mesh, purity greater than 95% of toner, according to alloy composition (W [0.50] Al [0.50]) C [1-x] x = 0.01-0.65 weighing in excess of 0-2% carbon;

2) After mixing into the milled graphite crucible, then put in the solid phase reactor in a vacuum or reducing atmosphere, heated to 1300-1600 ℃ under an inert atmosphere, heating rate of 45 ℃ / min, holding time of 50 to 100 hours;

3) During the reaction, samples were taken every 10-20 hours milling 30-60 minutes, and finally to obtain a high hardness (W [0.50] Al ↓ [0.50]) C [1-x] solid solution powder.

Preparation of carbon vacancy-type aluminum solid solution of tungsten carbide powder of the present invention to provide its biggest advantage is that less time-consuming production process without noise, simple equipment, technology, suitable for large-scale production.


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The present invention provides a method for preparing an intermediate tungsten alloy aluminum. Characterized in that:

Percentage by weight, of its components: 10 to 75 W, Nb of 0 to 75, 0 to 75 molybdenum, titanium, 0 to 20, the balance aluminum.

Specific steps are as follows:

1) Preparation of ignition can be used outside of the furnace smelting process: raw materials drying temperature 70 ~ 80 ℃, when adding ingredients scum ingredients, dosage is 5 to 15 percent of the total weight of raw materials;

2) We can use frequency furnace melting method: when the ratio of ingredients by adding anti-oxidants and flux.

The present invention aluminum master alloy melting point of tungsten is much lower than the melting point of the metal elemental make the process of preparation of melting titanium stabilized to avoid inconsistencies due to the melting point of the metal simple substance, melting the applied current fluctuated phenomenon is not easy to control;

The process is simple, no special equipment, the present invention is prepared using tungsten titanium aluminum master alloy, the alloy can be added to the package approach, small power consumption, low cost, easy preparation.


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