The present invention provides a scheelite tungsten alloy smelting method, using a dedicated three-phase electric arc furnace smelting of tungsten alloy. Specific steps are as follows:

1) First, the electric arc furnace is preheated by increasing the temperature of the electric arc furnace is heated to a temperature consistent with the smelting;

2) The steel scrap was added and heating was continued so that the furnace temperature was raised to 1800-2000 ℃;

3) And then with a good charge in the furnace smelting furnace in batches to vote, take charge, and two-thirds of the total volume of the total investment amount of one-third of pitch coke oven heated to a certain temperature, together with the regional refining; after scouring after 1 hour, the furnace temperature was raised to 2500-3000 ℃, the melt in the furnace, more than 80% reduction of WO3;

4) Before digging iron refining end, side by side dug step scouring feeding iron side then add one-third of the total charge and the total amount of the third batch of pitch coke digging iron;

5) After digging and then adding a third of tungsten alloy were poor pitch coke residue, pour slag, tungsten alloy products after finishing packaging and storage of water cooling;

Note: The above tungsten alloy smelting method, its charge outside the furnace with recipes for: scheelite concentrate 70% ~ 80%, FeO4% ~ 9%, SiO20.3% ~ 7%, FeSi4% ~ 9%, content 98% Fe1% ~ 5%; the above ingredients are thoroughly blended formulation can be absorbed.


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The present invention provides a process for the preparation of an alloy of tungsten oxide electrode material is added, concrete steps are as follows:

1) First, added tungsten oxide powder in a weight ratio of 0.1 to 1% carbon and 1 to 5% of tungsten oxide powder to form one or several alloying elements;

2) Then added in a weight ratio of 0.5% to 4% of the ThO2, one or both of CeO2, Y203 or La203 low work function oxide powder mixing;

3) The strip is cold-pressed billet growth in 1300-1500K presintered hydrogen atmosphere;

4) Finally,sintered at 2800-3500K next, and then the rotary forging, rolling, drawing, polishing process to achieve the desired electrode size.

Since the tungsten powder in a small amount of alloying elements added to the balance arcing oxide added during the decomposition process, control the decomposition rate of the oxide, sintering and arc stability during high-temperature growth of the tungsten grains to reduce the oxide electrode loss and improve stability of the arc, increasing the electrode surface area of ​​the liquid tungsten arc surface tension and reduce the loss of tungsten.


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The present invention provides an ultra-fine tungsten-copper alloy manufacturing process. WO3 powders or WO3-CuO composite oxide powder is the use of ultra-low temperature 60 ~ 120 ℃ air ultrasonic spray pyrolysis turn preparation of ultrafine nano-oxide powder. Specific steps are as follows:

1) Restore: low-temperature heat transfer prepared by ultrasonic spray nano or ultrafine WO3 WO3-CuO composite oxide powder as raw material, two H2 gas reduction, the first paragraph of reduction temperature of 380 ~ 5000 ℃, insulation 30 ~ 60 minutes; first made (WO2.9) ultrafine tungsten powder blue;

2) And then restore the second temperature is 700 ~ 780 ℃, kept for 40 to 60 minutes, using a tubular-type reduction apparatus reducing furnace to prepare a W W-Cu alloy powder or powders; reduction Sec above chemical reaction formula is as follows :

Restore the first paragraph: WO3 + 0.1H2 * WO2.9 + 3H2O ............... (1)

Second reduction; WO2.9 + 2.9H2 * W + 2.9H2O ............... (2)
Cu2O3 + H2 * 2Cu + 3H2 ............... (3)

3) High shear pulverization: The ultrafine copper tungsten alloy powder in a high shear mill pulverizing treatment, the rotational speed of 8000 to 30000 rev / min, the grinding time is 30-60 minutes;

4) Forming: This alloy powder using conventional steel forming unit pressure 200 ~ 800MPa, made ​​compacts;

5) Sintering: The green compacts H2 atmosphere for sintering the sintering furnace, heat 1000 ~ 1400 ℃ 30 ~ 80 minutes to obtain an average particle diameter of the tungsten-copper alloy ≤1.5μm.


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The present invention provides a method for preparing zirconium carbide tungsten particle reinforced composites. Specific steps are as follows:

1)Mixed with zirconium carbide and tungsten powder.The mixing method is wet-mixed, the mixing medium can be ethanol, acetone, may be added to steel balls or ceramic balls, the mixed powder was placed in a steel drum and mixed media were mixed, the mixing time for 8-36 hours;

2) Mixed and then dried in the drying chamber, while evaporating ethanol or acetone mixed media, and remove balls or ceramic balls;

3) The mixed powder, first cold press molding at room temperature, and then hot pressing, or not by cold forming direct hot pressing, sintering temperature is 1900 ℃ -2300 ℃, pressure mode for one-way or two-way plus pressure applied pressure 15-45MPa, sintering time is 0.5 to 5 hours incubation, the sintering atmosphere is hydrogen, argon, nitrogen or vacuum.


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The invention discloses a tungsten-manganese alloy, belonging to the technical field of metallurgy. The alloy contains 46.99% of tungsten, 51.78% of manganese and the balance of impurities by mass. The tungsten-manganese alloy has the advantages of enhancing strength and insulating property, and being light.


The invention belongs to the technical field of metallurgy, in particular to a wolfram alloy.

1) BACKGROUND:

Currently on the market, the mechanical properties of tungsten and manganese alloys generally poor, poor strength, insulation end, heavy, not very good wide range of applications.

2) SUMMARY OF THE INVENTION:

For the deficiencies of the prior art, the present invention provides an alloy of tungsten and manganese.

3) An alloy of the percent by mass: Crane 46.99%, 51.78% Mn, the balance being impurities.

4) Advantages

The present invention is: to increase the strength, enhanced insulation and light weight.

5) Specific embodiments:

The present invention will be described with reference to specific embodiments.

6) An alloy of the percent by mass: Crane 46.99%, 51.78% Mn, the balance being impurities.


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The present invention provides a nano tungsten carbide - cobalt alloy preparation methods, including hydrogen reduction and carbonization reaction. Specific steps are as follows:

1) The percentage by weight of the component WC-Co cemented carbide nano-set, i.e., set the WC alloy component content of 70 ~ 97wt%, Co content is 3 ~ 30wt%, take the appropriate amount of the acid-containing W aqueous ammonium nitrate solution containing cobalt Co amount of incorporation of ammonia, add the right amount of polyethylene glycol and ethylene diamine and mix well;

2) Nitric acid was added to adjust PH value to 1.6 to 2.0 to precipitate WO3, CoO particles in the mixture;

3) Removal of ammonia, the above paste-like mixture into the container 1 to the calcined for 3 hours at 600 ~ 800 ℃, WO3, and CoO to form a mixed powder particles;

4) The above mixed powder is placed in a quartz tube inside a quartz boat, the quartz tube was evacuated to exclude oxygen;

5) Pass into the hydrogen reduction, hydrogen purity of 99.99%, through hydrogen for 1 to 3 hours to obtain a metal W, Co nanopowders;

6) Turn off the hydrogen to high-purity quartz tube filled with acetylene gas C2H2 W nanopowder metal carbide, carbonization temperature of 500 ~ 950 ℃, carbonization time is 0.5 to 3 hours, the optimum carbonization temperature is 600 to 900 ℃, carbonization time is 1 to 2 hours to obtain a WC-Co composite powder of nanoparticles;

7) Vacuum hot pressing and sintering process, made ​​WC-Co cemented carbide bulk material.

The present invention provides nano tungsten carbide - cobalt alloy preparation method, the mechanical strength, abrasion resistance and other technical performance indicators are better than existing technology can be widely used in the production of tools, dies, gauges, and various mining drill kinds of wear parts.


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The present invention provides a nano tungsten carbide - cobalt - vanadium carbide cemented carbide manufacturing method, comprising the hydrogen reduction reaction of carbonation. Specific steps are as follows:

1) The percentage by weight of the component nano cemented carbide WC-Co-VC is set, i.e., set the alloy component content of WC 70-95wt%, Co content is 3 ~ 28wt%, VC is 0.1 ~ 2wt%, take the appropriate amine tungstate solution containing an amount of W, Co-containing solution, the amount of cobalt nitrate, vanadium chloride solution containing aqueous ammonia, the amount of V is incorporated, and adding an appropriate amount of polyethylene glycol diamine and mix well;

2) Nitric acid was added to adjust PH value to 1.6 to 2.0 to precipitate WO3, CoO, V3O5 nanoparticles;

3) Removal of ammonia, the above paste-like mixture into the container 1 to the calcined for 3 hours at 600 ~ 800 ℃, the formation of WO3, CoO, V2O5 nano powder mixture;

4) The above mixture was placed in a quartz boat in a quartz tube within, the quartz tube was evacuated to exclude oxygen;

5) Pass into the hydrogen reduction, hydrogen purity of 99. 99%, through the hydrogen gas for 1 to 3 hours to obtain a metal W, Co, V nano-powder;

6) Turn off the hydrogen to high-purity quartz tube filled with acetylene C2H2 gas metal carbide W, V nano-powders, carbonization temperature of 500 ~ 950 ℃, carbonization time is 0.5 to 3 hours, the optimum carbonization temperature of 600 ~ 900 ℃, carbonization time is 1 to 2 hours to obtain a WC-Co-VC nanoparticle composite powder;

7) Vacuum hot pressing and sintering process, made ​​WC-Co-VC nano-carbide bulk material.

The present invention provides nano tungsten carbide - cobalt - vanadium carbide carbide manufacturing method, the obtained product mechanical strength, abrasion resistance and other technical performance indicators are better than existing technology can be widely used in the production of tools, dies, measuring tools, mining drill and a variety of wear-resistant parts.


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The present invention provides a tungsten copper alloy magnesium infiltration method for manufacturing carbon electrode material, characterized in that: it processes include raw material preparation, mixing, forming, reducing treatment, pre-sintering, high temperature sintering, copper infiltration, finished, follow these steps:

1) Material preparation: purity tungsten powder ≥99.99%, grain size of tungsten powder ≤2.9μm, the particle size of nickel powder ≤1.74μm, carbon free carbon ultrafine powder, magnesium powder, nickel powder were used toner the chemical coating method for coating;

2) Mixing: the tungsten powder, chemically coated magnesium and carbon loading efficiency enclosed blender mixing, mixing time 18 to 24 hours;

3) Forming: the mixed uniformly into the steel alloy powder, and with the press pressed into billet, billet size according to user requirements;

4) Reduction treatment: one by the pressure of a good billet is loaded with a crane with a hydrogen gas through a sintering furnace, reduction treatment is divided into four phases: Phase I: reduction temperature 200 ~ 300 ℃ 0.5 to 1 hour second time stage: reduction temperature 350 ~ 500 ℃ ~ 1 hour time of 0.5 Third stage: the reduction temperature 55 0 ~ 700 ℃ for 1 to 1.5 hours Fourth stage: reduction temperature 750 ~ 950 ℃ for 2 hours;

5) Pre-sintering: after reduction of the billet after pre-sintering at 1000 ℃ temperature and hydrogen protection, pre-sintering time is 2 hours;

6) And the high temperature sintering of copper infiltration: After pre-sintered billet after high temperature sintering at 1100 ~ 1600 ℃ temperature and hydrogen protection, high temperature sintering time is 2 to 3 hours; while continuously sintered at a high temperature copper infiltration; final power natural cooling;

7) Finished: according to user requirements can be processed into various shapes electrodes.

Tungsten carbon present invention provides a magnesium copper alloy infiltration method for producing an electrode material, the electrode of the present invention is manufactured with a uniform composition, good anti-wear extreme anti-erosion resistance, good electrical conductivity, etc. advantages.


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The present invention describes a complex synthesis of nanocrystalline tungsten carbide - cobalt composite powder method.

Mainly consisting of preparation of tungsten - cobalt salt solution, the salt solution was spray-dried to prepare a homogeneous precursor powders, and at a certain temperature, fluidization H ↓ [2] restore, and then to CO / CO2 gas mixture for carbonization of the three process of the composition, characterized in that:

1)As preparing tungsten - cobalt salt solution introduced into an organic group: a saturated solution of the salt with organic tungsten (A) / W (Ⅵ) = 0.5 ~ 4 (molar ratio) was added organic material (A) , organic matter (A) and W salt complex reaction;

2)Then added to a saturated solution of a Co salt, adjusting the PH of the solution to above 7, the solution was precipitated to obtain a mixed sol dispersed height.

Note that: said organic material (A) containing -NH -N = O group and the organic compound, and 8-hydroxyquinoline and derivatives thereof in one.

The present invention describes a composite carbide reduction preparing nano tungsten carbide - cobalt composite powder, which has designed a recovery while reducing carbonization exhaust system, not only can more effectively control the WC grain size, and can greatly reduce the cost of production, has a greater industrial advantages.


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The present invention describes a lozenge grain tungsten carbide. Which comprises: 4-40% (by volume) of at least one selected from the group comprising Co, Ni and Fe as an iron group metal phase and the hard phase, and unavoidable impurities, the balance of a binder main component. Characterized in that:

1) Contains only a hard phase of tungsten carbide, or tungsten carbide not more than 50% (by volume) containing compound having a cubic structure, the cubic structure of the compound is selected from the periodic table, niobium and tungsten of Group 6b of the elements carbides and nitrides, the solid solution thereof and at least one body, the X-ray target Ka ray diffraction analysis (001) crystal plane and the peak intensity of (101) crystal plane are represented by h (001) and h (101 when) the tungsten carbide satisfy h (001) / h (101) ≥0.50.

2) Tungsten carbide contains not less than 20% (by volume) of carbide platelets (based on the total of tungsten carbide), not lower than the maximum length and the minimum length of such platelets in the tungsten carbide section to 3.0.


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