Scheelite Concentrate Smelting with Tungsten Iron Alloy
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- Category: Tungsten Patents
- Published on Wednesday, 10 September 2014 08:56
- Written by Sherry
- Hits: 2156
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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Preparation of Adding the Tungsten Oxide Alloy Electrode Material in Alloy
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- Category: Tungsten Patents
- Published on Tuesday, 09 September 2014 09:17
- Written by Sherry
- Hits: 2419
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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Preparation of Zirconium Carbide Tungsten Particle Reinforced Composites
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- Category: Tungsten Patents
- Published on Thursday, 04 September 2014 09:00
- Written by Sherry
- Hits: 2308
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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Ultrafine Tungsten Copper Alloy Manufacturing Process
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- Category: Tungsten Patents
- Published on Friday, 05 September 2014 09:01
- Written by Sherry
- Hits: 2418
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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Tungsten-manganese Alloy
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- Category: Tungsten Patents
- Published on Wednesday, 03 September 2014 09:10
- Written by Sherry
- Hits: 2388
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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