How to Machine Tungsten Alloy
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- Category: Tungsten Information
- Published on Friday, 13 February 2015 08:46
- Written by Sherry
- Hits: 538
Cobalt, nickel binder for powder metallurgy sintered density tungsten alloy, known as high-density alloy, also called heavy alloy. Such alloys can be formed by forging or heat treatment to improve their density and strength. Usually tungsten alloy tensile strength σb> 981MPa, hardness> HRC40.
Thermal conductivity than pure tungsten tungsten alloy small, grainy chip, tool - chip contact length is short, high cutting temperature, prone to tumors and adhesive wear knife. Tungsten alloys require cutting tool material thermal conductivity, high flexural strength and toughness, good red hardness. Recommended use ultra-fine grain tungsten carbide-based fine grain, such as YDl5, YM051 and so on.
Tungsten alloy cutting tool requires sharp, but also to ensure the edge strength. Tool geometry parameters can be selected: γO = -8o, αO = 8o, Κr = 75o, rε = 0.5mm. Cutting can be used: νC = 38m / min, f = 0.24mm / r, ap = 1mm. Cutting without cutting fluid.
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Ammonium Paratungstate (APT) Use
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- Category: Tungsten Information
- Published on Thursday, 12 February 2015 18:37
- Written by zsq
- Hits: 475
Mainly used in the manufacture of tungsten metal powder like tungsten trioxide or tungsten blue oxide;the downstream products of metallic tungsten powder have tungsten material series, such as tungsten, tungsten and other electric vacuum materials; there are alloy series too, such as tungsten carbide alloy blade, alloy drill, alloy molds, etc.; and other wear, pressure, temperature and other machinery and equipment components.Tungsten oxide can be obtained by calcined tungstic acid or APTCalcined in air (oxidizing atmosphere) to obtain tungsten trioxideCalcined in weak reducing atmosphere can be obtained industrial blue tungsten oxide - a mixture of a lot of WO2.9 and a small amount of WO2.72 with traces of WO3 and WO2.
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Influence of Production Conditions on Ammonium Paratungstate Nature
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- Category: Tungsten Information
- Published on Thursday, 12 February 2015 18:14
- Written by zsq
- Hits: 441
:In tungsten hy drometallurgical process , ammonium paratungstate nature affects directly tungsten powder nature , so it is very important to prepare good physical properties ammonium paratungstate .In this article , the relations between ammonium paratungstate physical properties and control conditionsare summarized .The focus of this article is on influencing mechanisms of some factors on ammonium paratungstate physical properties .The factores are crystallizationmethod , temperature , degree of supersaturation of solutio n(WO3 initial concentration , NH4Cl concentration , impurities in solution),pH range , agitation rate , seed crystal , supplements (NH4)2WO3 solution , crystallization period , crystallization end point mother liquor density , surfactant , vacuum degree and so on .
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Paratungstate in the Method of the Analysis of Impurities
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- Category: Tungsten Information
- Published on Thursday, 12 February 2015 18:32
- Written by zsq
- Hits: 437
The spectrophotometric determination of impurities in the ammonium paratungstate, mainly determined by the reaction temperature, reaction time, NaOH concentration and stirring speed on the active ingredients wolframite tungsten leaching. Also investigated the properties of the resin in the ion exchange process, the exchange of the solution before concentration and flow rate, desorbent concentration, flow rate and temperature and other factors on the impurity removal rate during crystallization temperature paratungstate crystals.
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Submicron Spherical Tungsten Powder Prepared with Ammonium Paratungstate
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- Category: Tungsten Information
- Published on Thursday, 12 February 2015 18:11
- Written by zsq
- Hits: 447
Violet tungsten oxide was prepared with pure ammonium paratungstate in argon gas. Tungsten powder was obtained from violet tungsten oxide through deoxidation in hydrogen gas (rate of purity: 99.99%, dew point: –40 °C), and tungsten powder was oxidized in the air. Tungsten oxide was reduced to tungsten powder in hydrogen gas. The samples were characterized with the laser particle size distribution measuring instrument and the electron probe scan instrument. The results show that submicron tungsten powder can be obtained through circulatory oxidation twice and reduction three times. The percentage of the particle size distribution of submicron spherical tungsten powder is 95.73% between 0.1 μm and 1.0 μm, and its BET is 1.082 m2/g.
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