CVD tungsten tube morphology:

In the CVD (Chemical Vapor Deposition) process, due to the chemical reaction with H₂, WF₆ adsorbed on the surface of the copper matrix reduce to tungsten atom, and these tungsten atoms will gather nucleation on the copper matrix surface and grow, at last, the tungsten tube is formed by cutting and other process.

The formation of the first layer of the microstructure is related to the forming process of the initial crustal nucleus of tungsten layer and nuclei initial growing up process.

Tungsten atoms will deposit and diffuse on the surface of the deposition matrix and gather on the surface of the active matrix position, these positions are usually near the grain boundary, surface level position and the crystal defect surface outcrops.

When nucleation aggregated reach a certain degree of supersaturation, the deposited layer of crystals will form initial nuclei. Because those active sites presented on the deposit surface distribution is not uniform, so, from the microscopic point of view, the initial deposition surface nuclei are not uniformly distributed.


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Tungsten carbide buttons are widely applied in geological prospecting, coal mining and oil well boring. Because of its high wear resistance, high bending strength and high hardness, tungsten carbide button is ideally suited for wear parts, other machine parts and dies which are subject to severe service conditions, such as high temperatures, corrosion and abrasion.
Proper usage of tungsten carbide button can avoid button cracking and bending, save physical labor and working time, promote work efficiency.

Figure out the essence of rock drilling is very important. Through study the density and hardness of rock, use the proper grade of tungsten carbide button. Thus avoid the improper use of tungsten carbide button which may cause severe damage due to the over-high pressure. During the drill process, observe the drilling pressure, use the correct drilling method, and stop using tungsten carbide button if it gets blunt. 


Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
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Due to its high density, excellent absorption behaviour against radiation, and environmental friendly characteristic, tungsten alloy can be the best choice to produce container inspection tungsten radiation shield. Container inspection tungsten radiation shield is usually used in container inspection system as the main components of gamma radiation detectors, gamma radiation detectors, and neutron radiation detectors. Those detectors can be used in ports, prisons, and border, which can detect weather mass destruction weapons, explosives, weapons, drugs and undeclared goods are hiding in the vehicles.

The photograph below shows the tungsten alloy radiation shielding in container inspection.

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During the rock drilling process, tungsten carbide button works by impact crushing on hard rock in order to drill holes on the rock. As a result tungsten carbide button will have friction and crash with the rock. It will cause unavoidable abrasion. Before it cracks, abrasion is a normal failure mode of tungsten carbide button.

Tungsten carbide button bit fails because of abrasion which can not drill rock any more. During the crashing and friction, hard grain in the rock penetrates into the soft binder layer of tungsten carbide button. In the later process, tungsten carbide grain spalls and a small part of tungsten carbide button is worn. Under the continuous pressure of rock drilling machine, tungsten carbide button keeps being abrasive and the contact area between rocks enlarges, tungsten carbide grain spalls little by little. At last tungsten carbide button can no longer be used.


Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
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