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Definition and properties of Cemented carbide

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:04; Hits: 1832

Cemented carbide is a powdery metallurgical material; a composite of tungsten carbide (WC) particles and a binder rich in metallic cobalt (Co). Cemented carbides for metal cutting applications consist of more than 80% of hard phase WC. Additional cubic carbonitrides are other important components, especially in gradient sintered grades. The cemented carbide body is formed, either through powder pressing or injection moulding techniques, into a body, which is then sintered to full density.

WC grain size is one of the most important parameters for adjusting the hardness/toughness relationship of a grade; the finer grain size means higher hardness at a given binder phase content.

The amount and composition of the Co-rich binder controls the grade’s toughness and resistance to plastic deformation. At equal WC grain size, an increased amount of binder will result in a tougher grade, which is more prone to plastic deformation wear. A binder content that is too low may result in a brittle material.

Cubic carbonitrides, also referred to as γ-phase, are generally

added to increase hot hardness and to form gradients.

Gradients are used to combine improved plastic deformation resistance

with edge toughness. Cubic carbonitrides concentrated in the cutting edge improve the hot hardness where it is needed.Beyond the cutting edge, a binder rich in tungsten carbide structure inhibits cracks and chip hammering fractures.

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Tungsten Carbide Composite Rod

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:02; Hits: 1867

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.

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TUNGSTEN / MOLYBDENUM PRODUCTS

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:00; Hits: 1976

Tungsten and molybdenum, having high melting point, are used in many industrial fields because of their excellent high-temperature resistance. They are used for electric bulbs filament, discharge-lamp electrodes, electronic bulb components, welding electrodes, heating elements, etc.

Nippon Tungsten produces tungsten powder for raw materials and wires and rods made from tungsten and molybdenum in various shapes according to each application.

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cemented carbide tips for coal cutter

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 19:01; Hits: 1881

made from 100% virgin raw material; stable and continuous production ability. free online technical service available

Our company is a professional tungsten carbide manufacturer located in Zhuzhou City, the world-renowned research and production base of tungsten carbide. Our company adopted the latest research achievements and advanced experience in carbide materials both at home and abroad.

coal cutter bits:

-- good quality, fair price;-- in gradeYG11C, YG8C , YG6 and YG8;

-- high toughness and wear resistance;

-- sample available;-- prompt delivery.

Application: these carbide buttons can be use for the drilling of oil well, water well and so on.

Physical & mechanical properties of main grades

YG8C: used for the drilling of medium hard and soft rock formation.

YG11C: used for the drilling of hard and super hard rock formation.

So far, our carbide buttons are exported to Germany, USA, India and Mid-Eeast countries, and enjoying high reputation with good qualilty.

cemented carbide tips for coal cutter

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why cemented carbide is it the hardest in metals

Details: Category: Tungsten Information; Published on Friday, 06 September 2013 18:58; Hits: 1906

All the metals we can see have shapes. They are a body and parts of a car, parts of a pencil case, and a screw. They all have the shapes according to applications.

In giving a shape to a metal, the metal must be cut or shaved. The saw or knife used in such a work is the cemented carbide. Therefore, cemented carbide must be the hardest in metals. In addition, the secret of the hardness is that cemented carbide contains hard substance and tough metals that bond the substance. The hard subsistence is tungsten carbide (WC), carbide of tungsten. Diamond made of carbon is as hard as diamond is, and the composite of tungsten and carbon is the second hardest. Tough metals are cobalt (Co) and nickel (Ni) which are the families of iron. These two metals make a hard and strong alloy in combination with each other. The structure of cemented carbide is shown in Fig. 1 below.

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