Tungsten-rhenium Alloy and Preparation Method

The invention discloses a tungsten-rhenium alloy which contains 65-75ppm of potassium and 0.45-0.55% of rhenium.

The invention also discloses a manufacturing method of the tungsten-rhenium alloy, which comprises the following steps: A. preparing doping tungsten-rhenium powder: mixing doping tungsten powder solid and ammonium rhenate solution to obtain a doping tungsten-rhenium instillation, and drying the instillation to obtain doping tungsten-rhenium powder, wherein in the mixing process, the temperature is kept at 30-50 DEG C and the solid-liquid weight ratio is (100-300):5; B. reducing to obtain tungsten-rhenium mixed powder; C. compacting; D. presintering; and E. sintering to obtain the tungsten-rhenium alloy.

The method has the advantages of simple technique, uniform distribution of doping rhenium in the alloy, and favorable material uniformity; and the prepared tungsten-rhenium alloy has favorable high temperature properties and processability, and thus, is an ideal new material for lamp filaments.

Tungsten-rhenium-alloy


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Method for Recovering Nickel and Tungsten by Waste Nickel and Tungsten Catalyst

The invention provides a method for recovering nickel and tungsten by a waste nickel and tungsten catalyst.

The method comprises the following steps of: first, reducing roasting the waste nickel and tungsten catalyst at a high temperature to reduce nickel and ferric ions in the waste nickel and tungsten catalyst to metals nickel and iron, wherein other oxidants are not reduced; then, adding a copper liquid to the roasted material, replacing metals nickel and iron with copper ions, wherein nickel and iron are in ionic states to enter into the liquid; then, filtering and extracting the replaced and leached liquid; separating nickel from copper and iron, wherein the raffinate obtained by extraction is a pure nickel liquid which can be directly concentrated and crystallized to obtain nickel crystals; mixing the filter residue replaced and leached with sodium carbonate, roasting at a high temperature and washing with hot water to obtain a liquid containing sodium tungstate, wherein the filter residue is used for recovering aluminum and copper; performing acidification to the liquid containing sodium tungstate; and washing and drying the filtered filter residue with hot water to obtain tungstic acid with purity over 98.5%.


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Preparation of Tungsten Micro Lanthanum-doped

The present invention relates to a micro-lanthanum-doped tungsten preparation method comprises the following steps: (1) pre-reduction to ammonium paratungstate blue tungsten; (2) the incorporation of silicon, potassium, aluminum nitrate solution, prepared doped tungsten blue; (3) the amino acid solution is sprayed onto the lanthanum doped tungsten blue stirring and drying, to obtain amino acid lanthanum doped tungsten blue; (4) a reduction reaction in the reduction furnace; (5) acid, to obtain a tungsten alloy powder of lanthanum ; (6) pressed into uniform density tungsten billet; (7) is pre-sintered to obtain a pre-sintered strip; (8) a sintered sintered to obtain a sintered article incipient fusion; (9) swaging, to obtain a tungsten rod; (10) annealing; (11) swaged to obtain tungsten rod; (12) Crude stretch; (13) the oxidation annealing; (14) via a plurality of motifs drawn into the required fine tungsten wire.

The invention has the advantages of simple process, easy to implement and cost advantages of production while using this method produced by micro-lanthanum-doped tungsten has a long life, good optical performance, strong seismic performance and a light bulb filament in the use of a small amount of sag features.

tungsten-micro-lanthanum-doped


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Method for Producing Extra-coarse Tungsten Powder

The present invention belongs to the technical field of metallurgy, in particular to provide a process for producing ultra-coarse tungsten powder method.

Wherein the intermediate product is ammonium tungstate solution of sodium tungstate and tungsten hydrometallurgy as raw material, by mixing the two solutions, concentrated by evaporation and drying by heating to obtain precursor, adding a certain proportion of the precursor thin tungsten powder recycle material, subjected to a hydrogen reduction in a tube furnace, and then washed with water to remove the sodium ions by means of ultrasonic waves, filtered and dehydrated with industrial alcohol, and finally dried under vacuum and sieved to obtain extra coarse tungsten powder, screening out the fine tungsten powder Returns the raw material recycling. The present invention is a simple process equipment, reducing the temperature is low, the reduction time is short, high efficiency, low cost, can be prepared in a particle size of 60 ~ 150μm ultra coarse tungsten powder, crystallized complete, spherical, good formability, high purity.


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Process for Producing Tungsten Powder

A process for producing tungsten powder, tungsten can be prepared by non-ferrous metal processing products - ultra-pure tungsten powder, widely used in aerospace, electronics, machining, atomic energy and other fields.

In paratungstate (APT) as raw material, baked solution, restore, pickling, and product protection processes in the system, its purity ≥99.99%, when the average particle size 3.0-6.0μm Fei, the content of oxygen ≤300ppm. Take non-ferrous metals in accordance with the present invention is made of ultra-pure tungsten powder technology, low impurity elements in the production of tungsten powder inclusions, sintered tungsten metal products crystalline grains evenly, not brittle.


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High-density Tungsten Alloy Containing Rare Earth Oxide for Armor-piercing Bullet Core and Preparation Method Thereof

The invention relates to a high-density tungsten alloy containing rare earth oxide for an armor-piercing bullet core.

The alloy comprises the following components in parts by weight: 90-95 parts of tungsten, 0.05-2.0 parts of lanthanum oxide or cerium oxide, 4.95-9.95 parts of binder phase nickel and ferrum. The invention also relates to a preparation method of the high-density tungsten alloy, and the method comprises the following steps: evenly mixing and reducing tungsten oxide and rare earth oxide to obtain compound tungsten powder; then mixing the compound tungsten powder with the binder phase; and successively carrying out pressing, sintering, argon heat treatment, working hardening, prestraining aging heat treatment and the like on the mixed material.

Through the reasonable component proportion and preparation method, the high-density tungsten alloy material disclosed by the invention has the advantages of excellent comprehensive mechanical property, such as high strength and high plasticity, and stable performance, thereby providing a wide application prospect for developing and designing new types of armor-piercing bullet with new functions.


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Method for Preparing WC-Co (tungsten carbide-cobalt) Nano-powder

The invention discloses a method for preparing WC-Co (tungsten carbide-cobalt) nano-powder, which comprises the following steps of: firstly, preparing tungsten oxide-cobalt oxide powder by adopting a citrate or package method; secondly, introducing ammonia gas into the obtained tungsten oxide-cobalt oxide powder for nitridation to obtain tungsten nitride-cobalt nitride powder; and thirdly, mixing the obtained tungsten nitride-cobalt nitride powder with carbon black, performing ball milling, and performing heat treatment under a vacuum or inert atmosphere with the air pressure of less than 200Pa to obtain the WC-Co nano-powder; or directly charging the obtained tungsten nitride-cobalt nitride powder into a tube furnace, and introducing mixed gas of methane and hydrogen gas into the tube furnace for carbonization to obtain the WC-Co nano-powder.

The preparation process disclosed by the invention has the advantages of simplicity and practicality, strong maneuverability, and easiness of large-scale production. Moreover, the prepared powder has the advantages of small particle diameter, uniform particle size distribution and good sintering activity.


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Processing Method of Tungsten Filament And Additive Thereof

The invention involves a tungsten filament production method and it special additives, the method includes the following steps: weighing certain tungsten oxide and putting into reactor, adding additives which weight percentage is 0.8 ~ 1.2% relative to tungsten oxide, adding aluminum nitrate; adding water and mixing uniform, drying; hydrogen gas deacidizing and preparing doping tungsten powder in multi-pipe furnace, the dew-point of hydrogen gas <=-40DEG C, the hydrogen gas flow is 1.5-1.7 m3/h, load-canoe amount is 400-500 g, push-canoe velocity is 1.5-2.5 canoe/h, the first deacidizing temperature is 600-650DEG C and the second deacidizing temperature is 800-900DEG C, the prepared doping tungsten powder is produced to tungsten strip through profiling and one time incipient fusion sintering, then is produced to thermos table tungsten wire through pressure processing; the invention has advantages of high production efficiency, high content of potassium in tungsten filament, good resistant temperature property and free-fluohydric acid pollution.

tungsten-filament


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Method for Measuring Tungsten Content in Hard Alloy

The invention provides a method for measuring tungsten content in hard alloy.

The method comprises the following steps: dissolving tungsten-containing hard alloy by using a solution of sulfuric acid and ammonium sulfate, forming a tungstic acid precipitate in a sulfuric acid medium, filtering, performing high-temperature burning on the filtered precipitate to form tungsten trioxide, and measuring the tungsten content in the filtered filtrate by adopting an inductively coupled plasma (ICP) method, wherein the sum of the contents of the tungsten in two parts is the tungsten content in the hard alloy.

The method has the advantages of simplicity and practicality in operation, simplicity in equipment and accurate and reliable detection result.

tungsten-hard-alloy


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Method for Producing Ferrotungsten With Tungsten Carbide Obtained by Tungsten-containing Waste Processing as Raw Material

The present invention relates to a method for producing ferro-tungsten, tungsten-containing waste treatment especially to get raw materials for the production of tungsten carbide tungsten iron approach involves existing ferro-tungsten tungsten concentrate production process mainly as raw material, the use of an electric furnace as the main production equipment, production large, technology is more mature, but this process of smelting long time, high energy consumption, the complex process equipment operation, large area.

The present invention is to overcome the drawbacks of the prior art, the technical solutions adopted by the roasting is tungsten carbide, aluminum thermal reduction method and then through the production of tungsten alloy. Effective use of the present invention, tungsten-containing waste, to achieve a tungsten-containing waste processing, recycling, meaning significant resources; high recovery rate, significant economic benefits.

ferro-tungsten


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