The present invention relates to a method for manufacturing a phosphorus content of less than 1 ppm by weight of a high-purity tungsten powder, wherein the ammonium tungstate solution in accordance with the amount of the tungsten inclusions are translated ppm by weight of a phosphorus-containing impurities as the starting material above , by the following 50 ℃ using hydrochloric acid in which and the pH was adjusted to 4 and less than 7, so that eleven hydrated ammonium paratungstate crystalline precipitate, which was further heated to 70 ~ 90 ℃, filtered at a high temperature to obtain a pentahydrate crystals of ammonium paratungstate, and then the crystals of ammonium paratungstate pentahydrate obtained tungsten oxide calcined, and the hydrogen reduction of tungsten oxide to obtain a high-purity tungsten powder.

The present invention also relates to a phosphorus content of 0.4 ppm by weight of high-purity tungsten powder manufacturing method is characterized in that, in the use of hydrochloric acid and the pH adjusted to 4 steps or more and 6 or less, and follow the same procedure to give high purity tungsten powder. Accordingly, the phosphorus content can be effectively reduced.

A phosphorus content of less than I ppm by weight of the manufacturing method of high-purity tungsten powder, wherein the amount of tungsten inclusions in accordance with the translation of phosphorus-containing impurities I ppm or more by weight of ammonium tungstate solution as a starting material, By below 50 ° C with hydrochloric acid to which, and the PH was adjusted to 4 and less than 7, so that eleven hydrated ammonium paratungstate crystalline precipitate, which was further heated to 70 ~ 90 ° C, filtered at the heating temperature state pentahydrate obtained crystals of ammonium paratungstate, and then the crystalline pentahydrate paratungstate tungsten oxide obtained by calcining, and the hydrogen reduction of tungsten oxide to obtain a high-purity tungsten powder.

A manufacturing method of a phosphorus content of 0.4 ppm by weight of a high-purity tungsten powder, wherein the ammonium tungstate solution in accordance with the amount of the tungsten inclusions are translated by weight PPm I phosphorus containing impurities as the starting material in the above By 50 ° C and less hydrochloric acid for neutralization to adjust the pH to 4 or more and 6 or less, so that eleven hydrated ammonium paratungstate crystalline precipitate, which was further heated to 70 ~ 90 ° C, filtered at the heating temperature condition pentahydrate obtained by crystallization of ammonium paratungstate, and then the crystalline pentahydrate calcining ammonium paratungstate obtained tungsten oxide, tungsten oxide and the reduction with hydrogen and made of high-purity tungsten powder.




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The present invention describes a manganese-chromium-tungsten bainitic steel, belongs to steel alloy technology field. Characterized in that: it comprises the following components, its percentage by weight: C0.06 ~ 0.55wt. %; Mn1.90 ~ 3.00wt. %; Si0.20 ~ 2.00wt. %; Cr0.10 ~ 2.00wt. %; W0.10 ~ 1.00wt. %; Remainder being Fe.

Steels of the invention is a new class of manganese-chromium-tungsten bainitic steel, manganese, silicon, chromium as the main alloying elements, plus tungsten as the main and auxiliary elements, with high strength and toughness and bainite air cooling hardenability, under air cooling conditions can be obtained bainite / martensite phase complex organization, exempt from hardening process for the manufacture of a variety of shaft parts, structural parts, all kinds of springs, wear parts, precision molds and resistance grinding steel castings.

Manganese-chromium-tungsten bainitic steel after tempering with excellent strength and toughness, which can close substitutability quenched and tempered steel, used to make a variety of high-strength structural parts, and surface hardening.




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The utility model is crystal processing techniques, and, more specifically, a sapphire crystal is a crystal growth furnace used for the growth of the composite tungsten rod heater.

Currently, the prior art method of sapphire crystal growth is generally used Kyropoulos, Kyropoulos sapphire crystals grown using tungsten rod heater, the heater is made of tungsten rod diameter and a length of 4 ~ IOmm tungsten rods is formed by bending a circular heater assembly of the cage-like structure, the diameter and the number of cage-shaped heater according to the temperature required for the tungsten rods conditions Kyropoulos course be selected, however, the tungsten cage Stick heater has the following significant disadvantages:

1) Due to the bending processing of the tungsten rod bow 丨 into more stress is easily deformed such that the bottom heater is broken, short life;

2) High temperature stability is not good, easy to deformation caused by uneven temperature field, affecting the quality of products;

3) Repair and maintenance costs are higher.

In order to solve the above problems, the utility model provides a long life, stable temperature performance, temperature field uniformity, lower repair and maintenance costs of sapphire crystal growth composite tungsten rod heater, its specific programs: the sapphire crystal growth by the heater bar and the composite tungsten copper electrode rod tungsten, tungsten plate, fixing nut, fixed tungsten rings, characterized in that the fixed ring is set to a circular tungsten, tungsten rod fixed at uniform tungsten ring, tungsten the upper end of the rod is provided a copper electrode, the lower end of the tungsten bar tungsten plate is provided, by fixing the upper end of the tungsten rod and a nut fixed to the copper electrode connected to a lower end fixed by a tungsten rod with a tungsten plate fixedly connected to the nut.

1 conjunction with the accompanying description of the utility model in more detail, so that the public a better understanding of the practical implementation of the new method, the utility model specific embodiments are: sapphire crystal growth of the composite made of copper tungsten rod heater an electrode, tungsten rod 2, tungsten plate 3, the nut 4 is fixed, consisting of a fixed tungsten ring 5, characterized in that the tungsten ring 5 is set to a fixed circular, fixed ring 5 is disposed uniformly tungsten tungsten rod 2, the upper end of the tungsten rod 2 providing a copper electrode 1, 2 is provided with a lower end of the tungsten bar tungsten plate 3, the upper end of the tungsten rod 2 is fixed by the fixing nut is connected to the copper electrode 4 I, the lower end of the tungsten rod 2 is fixedly connected to the fixing nut 4 by tungsten plate 3.




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The present invention describes a long-life tungsten metal-casting skateboard, about a steelmaking and continuous casting equipment.

This invention relates to provide a long-life expectancy of tungsten metal-casting the slide, which can increase the service life of the slide casting 1-2 times.

Aspect of the present invention is a tungsten containing metal casting long-life skateboard, comprising a base material, the matrix material contains a metal tungsten powder. Tungsten powder and the weight percentage of the matrix material is from 0.5 to 2.0%. The metal tungsten powder as the powder through a 200-mesh sieve, the content of W ≥99.5%. The drying temperature is 150-220 ℃, the firing temperature is 1200-1450 ℃.

The present invention is used in steelmaking and continuous casting production equipment.




Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
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Email:   sales@chinatungsten.com
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