The present invention provides a process for sintering tungsten alloy bar. It is mainly used in sintering process that the tungsten alloy powder made tungsten alloy strip and then made ​​ tungsten alloy wire. Characterized in that:

Hydrogen protected through the use of medium frequency induction furnace sintering method instead of direct indirect heating power vertical melt sintering.

Specific steps are as follows:

1) Sintering system: Press 150 ~ 350 ℃ / hr heating rate to 2150 ~ 2350 ℃ sintering 3 to 6 hours;

2) And then cooled. Sintering process using sintered tungsten alloy of the present invention have uniformity and consistency, and its processing performance also improved, silk of the finished product rate also increased from 5 to 10%.

The present invention provides a tungsten alloy bar sintering process, which can save energy, with significant social and economic benefits.


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The present invention provides a tungsten alloy smelting methods. Characterized in that:

The charge is heated to a temperature region; then adding a certain amount of tungsten ore concentrates with a reductant and a mixture.

Specific steps are as follows:

1) First, 100-110% the theoretical amount of material added to the steel material or iron in an electric furnace heated to a reaction tank 1540-1590 ℃, melted;

2) Then by mixing the tungsten concentrate, aluminum particles and sodium nitrate mixture to 70-110 kg / min m Speed ​​2 to join the tank; during feeding, continued heating, the furnace temperature was raised to 2500-3000 ℃;

3) After the addition, continue to add heat to the melt, maintaining a temperature above its melting point slag 7-20 minutes;

4) Stop heating the furnace to melt naturally cooled after solid baked.

Tungsten alloy smelting method of the invention has the smelting process short, simple application, low energy consumption, the advantage does not require ignition agent, reducing the amount of provincial and so on.


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The present invention describes a tungsten - copper - nickel - carbon high temperature resistant alloys, which are tungsten and tungsten carbide-based powder metallurgy products. Characterized in that:

Composition (weight percent) were as follows:

1) 15 ~ 60% WC, 15 ~ 30% Cu, 1 ~ 5% Ni, 1 ~ 6% C, balance W;

2) 15 ~ 60% WC, 15 ~ 30% Cu, 1 ~ 5% Ni, 1 ~ 6% C, 0.2 ~ 0.5% MoC, balance W;

3) 15 ~ 60% WC, 15 ~ 30% Cu, 1 ~ 5% Ni, 1 ~ 6% C, 0.2 ~ 0.5% Cr3C2, balance W;

Note: The alloys and their products, based on an average particle size of 6 ~ 8μm tungsten powder and tungsten carbide powder, and is less than the copper powder, nickel powder and carbon powder as the raw material 75μm, respectively, according to the milled mixture of the alloy composition, molded porosity (volume ratio) of 15 to 35% of the frame blank, and placed together with the added copper powder or copper skeleton rough vacuum or hydrogen furnace 1150 ~ 1440 ℃ protected molybdenum wire furnace is infiltrated sintered 0. 5 to 2 hours.

The present invention describes tungsten - copper - nickel - carbon high temperature resistant alloys, high-temperature operation is also applicable to the other need to wear the appropriate fields.


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The present invention provides a method for preparing cerium tungsten powder. Characterized in that:

Added to the tungsten trioxide or ammonium paratungstate after calcination at 800-850 ℃ WO3 in the cerium acetate solution,then stirred with a high pressure that concentrated by evaporation, drying, and finally through the primary and secondary reduction and sieved to prepare a tungsten ,which can group containing 1-8% (by weight), cerium oxide, cerium tungsten powder.

Tungsten cerium powder production method of the invention solves the conventional tungsten cerium powder preparation process of environmental pollution problems, the present invention is prepared by the process containing 1-8% (weight) of the tungsten raw powder of cerium oxide can be prepared in the cerium content 1.0-6.0% (weight) of the cerium-tungsten electrode material, thereby overcoming the electrode material is tungsten, cerium, cerium oxide content of more than 1.0% of the difficulties in the process, and the electrode material is tungsten, cerium 4-6% there are some substantive breakthrough in the range.


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The method of manufacturing an electrode cerium - the present invention provides a production of tungsten. Mainly characterized in that:

Ammonium solution tungsten and rare earth oxides as raw materials, by suspension crystallization, prepared paratungstate - rare earth oxide crystals, after reduction, burn, melt vertical machining processes, and ultimately made ​​products.

The present invention is relatively good compared with the existing wet, simplifying the two processes, save time and reduce energy consumption and improve productivity, and eliminates the process of release of NO2, SO2 and other hazards to the environment and the human body gas. Distribution of rare earth oxides in the matrix of tungsten in uniform dispersion, excellent electrode arc performance, long service life.


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The present invention provides a process for the production of high heavy tungsten alloy rod material. Specific steps are as follows:

1) Powder mixing;

2) Powder was added to the molten mixture of the plasticizer, the plasticizer is a white wax having a melting point of 48-56 ℃ added in an amount of 4-7% by weight;

3) Powder extrusion molding, extrusion temperature is 35-50 ℃;

4) Conducted to sinter removal of plasticizer and pre-sintering, when the removal of the plasticizer with the furnace to heat up, after more than 900 ℃, holding more than one hour;

5) liquid-phase sintering, the sintering temperature of 1480-1540 ℃;

(6) Vacuum treatment.

The present invention provides a process for the production of high-density tungsten alloy rods, which can be large quantities of continuous production, productivity and material utilization is high, stable quality and low cost.


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The present invention provides a method for the separation of aggregates from ultrafine tungsten carbide powder. Specific steps are as follows:

1) The dispersing agent is added to the medium by sedimentation with ethanol or petroleum ether or ethylene glycol in a mixture of oleic acid composition, formulated as a solution settlement L1;

2) Then dispersed evenly 10min - 15min to make use of ultrasound;

3) Take over the settlement ultrasonic dispersion was poured into a container and sedimentation, respectively L1 separating tube, and the solution was poured into the container does not exceed 10% of the volume of the solution separated by settling tube, and the tube was poured into a solution of sedimentation separation account settlement L1 80% to 90% of the volume of the separation tube;

4) WC powder was added to the vessel to prepare a concentration of 20 ~ 25g / l solution of L2; L2 solution was dispersed using an ultrasonic ultrasonic 20min ~ 25min;

5) Then pour sedimentation separation tube and start timing;

6) The difference between the original WC powder having an average particle size, respectively, at different times after the start time of a continuous solution acess 5-8 seconds, and the remaining solution was collected one time;

7) Centrifuge the WC WC powder is separated from the solution containing the collected out at 70 ~ 80 ℃ vacuum dried for 2 to 3 hours to obtain non-agglomerated powder and a powder agglomeration.


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The present invention provides a process for the preparation of tungsten-copper heat sink materials and electronic packaging materials. Specific steps are as follows:

1) Powder is ready to take purity ≥99.95%, the average fee's 3-8 micron particle size of tungsten powder, take purity ≥99.95%, an average particle size of 300 mesh copper powder stand;

2) Add the induction agent and mixing the copper powder as an inducer of the tungsten powder mixed in a powder blender;

3) Compression moulding, including the mix and mold in predetermined shape, and mold tungsten copper green automatically performed after forming isostatic overburden pressure treatment;

4) Pre-pressing sintering step 3 after forming tungsten copper green pre-sintered molybdenum wire furnace to obtain tungsten copper alloy body;

5) Liquid copper infiltration ≥99.95% purity liquid containing copper in copper stove in infiltration, tungsten copper alloy pre-sintered body was immersed in the liquid copper 1200 ℃ ~ 1400 ℃ copper immersion in liquid-penetration for 1 to 2.5 hours, the process under a protective gas or reducing gas mixture of reducing gas and an inert gas for, and after the copper alloy of tungsten copper raised from the liquid body, then cooled to obtain tungsten copper alloy.

Note: in Step 2, the electrolytic copper powder added in an amount of 0% to 6% of the tungsten-copper alloy of the total weight, into the amount of electrolytic copper powder as described in step 2 and step 5, add the amount of copper in the liquid and accounted for 15 to 25 percent of the total weight of tungsten-copper alloy.


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The present invention provides a method for preparing tungsten-copper alloy rolled state, which involves a tungsten copper alloy materials.

Characterized in that:

It can solve the poor compatibility and a density of less than 99%, the high manufacturing cost of equipment, process complexity, energy consumption, low productivity among the existing problem of tungsten-copper alloy phase to phase. Tungsten copper alloy rolled state is made of tungsten powder and copper powder.

Preparation:

1) Prepared mixed powder;

2) Produced blank;

3) The billet was subjected to vacuum degassing;

4) Made tungsten copper alloy extruded material;

5) The tungsten-copper alloy extruded material is heated, pressurized after too.

The present invention rolling state phase and phase tungsten-copper alloy material has good compatibility, density increased 0.2% to 0.5%. The preparation method is simple and low cost of the necessary equipment, simple process, high energy consumption and production efficiency. The present invention is suitable for EDM electrodes, welding electrode, electronic packaging, and the preparation of the application of heat sink materials, and other fields.


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The present invention provides a method for preparing high density tungsten alloy materials. Characterized in that:

Solve the existing high density tungsten alloy products plasticity poor, low-intensity, small amount of deformation, the residual force, large equipment required method tonnage, long release time, the mold should be strictly sealed and high costs.

High density tungsten alloy material made ​​from tungsten powder, nickel powder, iron powder and cobalt powder. Steps are as follows:

1) Mixed powder A;

2) Produced blank;

3) Firing blanks;

4) Mixed powder B;

5) Produced lubrication medium;

6) Place the billet and the mold lubrication medium extruded, that was the high proportion of tungsten alloy materials.

The present invention is prepared by a high proportion of tungsten alloy plastic, high strength, large deformation and small residual force. Simple preparation method of the invention, a small tonnage of the necessary equipment, mold release time is short, there is no strict requirements for mold and low cost.


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