Carbide, chemical formula WC, by its own physical properties, hardness comparable to diamond, is widely used to produce cutting tools and wear-resistant member.

Production of tungsten carbide mixed into materials, carbonation, milling, screening, testing, and several other steps.

1, the Material Mix: the tungsten powder was mixed with carbon black. Depends on the quality of tungsten carbide powder tungsten powder mixed with carbon black uniform extent that if uneven mixing of materials, tungsten carbide powder will appear sinister and stratification. Cemented carbide manufacturing process, in general, the tungsten powder and carbon black were mixed in a ball mill (ball to powder ratio of 1:1, the ball diameter is 35 ~ 50mm), milling time is 2 ~ 4h, no material with the naked eye stratification that is considered mixed.

2, Carbonized Material: tungsten carbide powder, usually in the graphite tube furnace, carbonization process according to the granularity of tungsten powder and tungsten carbide particle size requirements to select, in general, fine tungsten powder carbonization temperature of 1300 ~ 1350 ℃, coarse tungsten powder carbonization temperature of 1600 ℃, carbonization time is 1 ~ 2h.

3, Ball: in a ball mill for milling. Ball to powder ratio of 1:1, the ball diameter is 10 ~ 45mm, milling time according to process requirements, usually 2h.

4, the Screening: In order to prevent the powder from flying, sieved to be carried in a closed case, the fine particles of tungsten carbide through 200 mesh sieve, the particles through a 250 mesh tungsten carbide, tungsten carbide coarse particles through a 60 mesh sieve.

5, After passing inspection derived products.


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Nuclear medical radiation shielding ：

Tungsten alloy(heavy alloy) is ideal for shielding against X rays and gamma radiation. The very high density of tungsten shielding (more than 60% denser than lead) allows a reduction in the physical size of shielding components, withoutcompromising their rigidity or the effectiveness of the shielding characteristics.

Tungsten heavy alloy shielding is used in applications such as collimator, nuclear shielding, beamstop, PET syringe shield, vial shield, isotope container, FDG container, multi leaf collimator etc.

Positron Emission Tomography (PET)

Positron emission tomography (PET) is one of the nuclear medicine techniques available for diagnosis. Whilst X-rays provide information on the structure of the body, PET shows the chemical function of a particular organism. PET involves the injection of FDG (a glucose-based radionuclide) from a shielded syringe into the patient. As the FDG travels through the patient’s body it emits gamma radiation which is detected by a gamma camera, from which the chemical activity within cells and organs can be seen. Any abnormal chemical activity may be a sign that tumours are present.

PET scans are frequently used to detect cancerous tumours and diseases of the brain and coronary arteries.
Applications for tungsten alloy shielding in PET include:
 
PET syringe shield
 
Tungsten vial shield
 
Tungsten FDG transport container
 
Collimator for gamma camera
 
Technetium generator

Multi Leaf Collimator

Radiotherapy destroys cancer by directing beams of radiation directly onto the tumour. The beams of radiation require a very fine focus to avoid harming the surrounding healthy tissue. This focus is achieved by using a multi-leaf collimator , consisting of two rows of very thin tungsten alloy plates, which can be configured to exactly match the dimensions of the tumour.


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Tungsten alloy is a best choice for tungsten alloy radiation shielding CT target applications, CT target used in both medical and industrial settings. Compared to traditional radiation shielding materials, tungsten alloy radiation shielding CT target provides excellent value. A high-density alloy CT target can provide the same energy absorption as lead using 1/3 less space. More and more industries are taking advantage of tungsten alloy’s reliable radiation shielding properties, especially used in CT target.

Tungsten alloy is ideal for shielding against CT target and gamma radiation. The very high density of tungsten alloy radiation shielding (more than 60% denser than lead) CT target allows a reduction in the physical size of tungsten alloy radiation shielding CT target components, without compromising tungsten alloy radiation shielding CT target rigidity or the effectiveness of the CT target shielding characteristics.

CT target can be subjected to higher loadings than stationary anodes. By rotation of dish-shaped CT targets under the electron beam, a new, already cooled part of the CT target surface is continually used as the focal spot. Moreover, the CT target cools down more rapidly by radiating CT target its heat. Far more energy per unit time can therefore be supplied to a CT target tube with a CT target in comparison with a stationary anode.

Applications for tungsten alloy radiation shielding in other medical include:PET syringe shield,tungsten vial shield,tungsten FDG transport container,collimator for gamma camera,technetium generator


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Nuclear research establishments use nuclear reactors or cyclotrons to study or create radioactive materials. Tungsten alloy is used in research activities as collimators (devices which guide or focus beams of radiation) or containers for radioactive isotopes. Tungsten alloy is ideal for shielding against both x- and gamma radiation. The very high density of tungsten shielding (more than 60% denser than lead) allows a reduction in the physical size of shielding components, without compromising the effectiveness of the shielding characteristics.


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