Most of the metal tungsten powder is used as a raw material for the production of tungsten carbide, so here describes a tungsten as a raw material, a direct method of producing tungsten carbide as the supplementary toner production methods are suitable.

In recent years, the development of the Russian Research Institute of Chemical Technology concentrates of the "furnace" aluminum thermal reduction method. Reliable naturally at high temperatures to restore directly from tungsten concentrate and make carbonation. Raw concentrates containing 55% ~ 60% WO3.

Aluminum thermal reduction of graphite, copper or steel crucible for, reduction and carburization process is very fast only 3 ~ 5min. The exothermic heat sufficient to melt all of the reaction product, and to a metal carbide-containing phase to obtain a good separation of the slag phase.

"Furnace" obtained by aluminothermic reduction of 55% tungsten metal phase containing 75% Fe 15% to 20%, the excess of the reducing agent from 1% to 4% of aluminum, the remaining metal impurities (Mn, Ni, Cu, etc. ) less than 2%, and a small amount of slag inclusions. CaO · 2Al2O3 slag phase and a mixture of CaO · Al2O3.
The metal phase crushed to 150μm, the obtained powder was acid leached to remove the acid-soluble substances, namely to obtain the final product tungsten carbide (WC).

X-ray diffraction analysis showed that the product contains only one phase WC. The chemical composition of tungsten carbide composite Russian technology standards TY48-19-265-91. WC product quality than traditional craftsmanship, carbonation completely free carbon content is reduced to 0.01% (typically less than 0.04%), the lattice defects are reduced, without W2C, Mo2C and Fe3W3C generation. Molybdenum scheelite lattice into the WC, do not generate separate Mo2C phase. It is very important to manufacture cemented carbide. WC impurity content of products (including Fe) meets the requirements, costs mean diameter of 9μm. Russia's experience has shown that the product can be used for drilling tools and carbide production.

High product quality, process simplicity and low cost of production is the production of tungsten carbide aluminum thermal reduction of the basic features. 


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn

 

Physical performance: Cemented carbide: HRA90—HRA92 Ma trix: RC30 'owing temperature:910-935 o C Standard Multi-edge particles can be used in the formation of the workpiece surface. For serious wear, with 1/3 of fine particles, need a broad particle size distribution to ncrease density and decrease in clearance of surfacing. Mesh size from 6.35MM-- 325 mesh.

Hardness 90.5 (8%) Shape Polygon in the workpiece surface alloy into distribution. This enables tighter particle inclusions and reduce the gap. Applied to extreme wear and tear. Three sizes: 8-10-16 16 14-20 5mm 8mm Particle shape is gravity cutting most important discovery. Those with sharp points and the sharp edge of particle coating is not good, so that there is a gap between the particles, reduced cutting edge and serious exposure. Gravity cutting alloy particles will have a very powerful cutting or grinding surface. Apply to play grinding, cutting, drilling, sawing, tools. The development of fine grades of coating alloy finds a solution to the problem of hard brittle, no wear-resistant due to softness.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten & Molybdenum Information Bank: http://i.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com
Molybdenum News & Molybdenum Price: http://news.molybdenum.com.cn