Silicon carbide is composed of tetrahedra of carbon and silicon atomswith strong bonds in the crystal lattice. This produces a very hard andstrong material. Silicon carbide is not attacked by any acids oralkalis or molten salts up to 800°C. In air, SiC forms a protectivesilicon oxide coating at 1200°C and is able to be used up to 1600°C.The high thermal conductivity coupled with low thermal expansion andhigh strength give this material exceptional thermal shock resistantqualities.

Silicon carbide ceramics with little or no grain boundaryimpurities maintain their strength to very high temperatures,approaching 1600°C with no strength loss. Chemical purity, resistanceto chemical attack at temperature, and strength retention at hightemperatures has made this material very popular as wafer tray supportsand paddles in semiconductor furnaces. The electrical conduction of thematerial has lead to its use in resistance heating elements forelectric furnaces, and as a key component in thermistors (temperaturevariable resistors) and in varistors (voltage variable resistors).

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The tungsten alloy reliably shields against X-rays and gamma radiation. With its new production process and great expertise in the materials field, Chinatungsten has made the manufacture of shielding components particularly cost-effective.

Whether in the world of medical or industrial X-ray technology, radiotherapy or nuclear power stations: Wherever high-energy radiation is used, it is vital to protect people against it.

The denser the material, the better able it is to protect from radiation. That is why heavy elements absorb X-rays and gamma radiation particularly well. Lead is still the most frequently used shielding material. Because it is a very soft material, it is mostly used only in combination with support structures made of steel.

Lead is a toxic material that is harmful to the environment and humans. The onerous recycling process makes lead expensive despite the low initial procurement costs. Many enterprises are therefore looking for a suitable alternative for providing reliable radiation protection.

The density of tungsten is 60 percent higher than that of lead. That is why even thinner layers of tungsten are able to provide reliable shielding against radiation. The tungsten alloy DENSIMET® is particularly suitable as a shielding material. It consists of tungsten and a small proportion of nickel-iron. Like tungsten, the material has excellent shielding properties. However, it is also considerably more ductile than tungsten and can therefore be machined better.

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Compared to traditional radiation shielding materials, tungsten alloys provide excellent value. A high-density alloy can provide the same energy absorption as lead using 1/3 less material! Unlike lead, you’ll also reduce administration costs by eliminating the need to obtain special licensing—it’s not required.

Tungsten 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, without compromising their rigidity or the effectiveness of the shielding characteristics.

Whether you need to protect sensitive electronic equipment or delicate human tissue, the energy-absorbing properties of Chinatungsten's tungsten alloys make them exceptional choices for radiation shielding applications, in both medical and industrial settings.

Clients all across the globe are taking advantage of tungsten alloy’s reliable radiation shielding properties. If you need to protect yourself, your patients or your equipment from the harmful effects of excess radiation, come to us!

Our products are available as finished machined parts or as short rod, round bar, and rectangular blocks.

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SiliconCarbide is the only chemical compound of carbon and silicon. It wasoriginally produced by a high temperature electro-chemical reaction ofsand and carbon. Silicon carbide is an excellent abrasive and has beenproduced and made into grinding wheels and other abrasive products forover one hundred years.

Today the material has been developed into ahigh quality technical grade ceramic with very good mechanicalproperties. It is used in abrasives, refractories, ceramics, andnumerous high-performance applications. The material can also be madean electrical conductor and has applications in resistance heating,flame igniters and electronic components. Structural and wearapplications are constantly developing.

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while foams of silicon carbide can be used very advantageously as a temperature-resistant and corrosionresistant insulating material and filter material or catalyst support. Pipes, crucibles, bricks or the like of these mixtures are suitable for use as high temperature materials because of their good chemical resistance.

Silicon carbide continuous filaments can be manufactured in accordance with a known process by exposing a carbon filament, manufactured according to conventional processes, to a silicon tetrachloride gas atmosphere at 800 1,200C (U.S. Pat. No. 3,433,725). According to a further known process, silicon carbide continuous filaments are obtained by coating a thin tungsten filament with silicon carbide, which is formed on the tungsten surface, kept at 1,200 to 1,300C, by pyrolysis of methyldichlorosilane (F. Galasso, et al., Appl. Phys. Lett. 9 (1966) 37). The disadvantage of these processes is that relatively thick silicon carbide fibers result which are difficult to handle, and their high manufacturing cost prevents a broad application.

Shaped articles such as, for example, pipes, crucibles or bricks can be manufactured according to known processes by sintering pulverulent silicon carbide, with addition of silicon powder, in appropriate molds, in most cases with the use of high pressures and temperatures, in the presence of nitrogen. In these cases, the silicon nitride formed acts as a sintering aid.

It is furthermore known to manufacture silicon carbide coatings on suitable shaped articles by pyrolysis of a mixture of slicon tetrachloride, toluene and hydrogen (K. Moers, Z. anorg. allg. Chem. 198 (1931) 243).

Foams of silicon carbide can be manufactured according to the process of U.S. Pat. No. 3,100,688, by reacting a mixture of finely divided silicon dust and carbon dust with dilute hydrofluoroic acid and heating the foam thereby formed, after drying, to a temperature of between l,400 and 2,200C under an inert gas.

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Black SiC is a man made mineral with a high thermal conductivity rating of 100 W/m-K. It is extremely hard, around a Mohs 9.1 or 2550 Knoop. It has high strength at elevated temperatures. For example, at 1000oC, SiC is 7.5 times stronger than Al203 (aluminum oxide). Black SiC will contain some free silicon and carbon and thus is not as pure as green SiC. Black will range in purity from 97-99% pure, depending on grit size. Green SiC is made from Silica sand and coke, and is extremely pure. Hexagonally shaped, it breaks into very sharp particles. Our green SiC is 99.5% pure, exceeding JIS, ISO, & FEPA standards.

Green SiC is harder than black, coming in at a 9.4 Mohs and 2600 on the Knoop scale. Green is often the media of choice when it comes wire sawing. The micronization process of manufacturing our green SiC is controlled by a computer. Then the material is water classified/separated - this produces a very tight particle size distribution, as well as a reduction in fines, as preferred for accurate wire sawing applications. Unless your application requires an extremely pure SiC, by default, black is preferred due to its more economic pricing.

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Compared to traditional radiation shielding materials, tungsten alloys provide excellent value. A high-density alloy can provide the same energy absorption as lead using 1/3 less material! Unlike lead, you’ll also reduce administration costs by eliminating the need to obtain special licensing—it’s not required.

Experts find that radiation exposure could be reduced by maxing shielding. The density of a material is related to its radiation stopping ability. Higher density means better stopping power and shielding. Due to a higher density, tungsten alloy has a much higher stopping power than lead. It is greater linear attenuation of gamma radiations means that less is required for equal shielding. Alternatively equal amounts of tungsten alloy shielding provide diminished exposure risks than equivalent lead shielding.

Tungsten alloy is a suitable raw material for radiation protection, as its combination of radiographic density (more than 60% denser than lead), machinability, good corrosion resistance, high radiation absorption (superior to lead), simplified life cycle and high strength. It can provide the same degree of protection as lead whilst significantly reducing the overall volume and thickness of shields and containers. Besides, compared with lead or depleted uranium in the past, tungsten alloy is more acceptable in this case, for they are non-toxic.

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Tungsten 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, without compromising their rigidity or the effectiveness of the shielding characteristics.

Whether you need to protect sensitive electronic equipment or delicate human tissue, the energy-absorbing properties of T&D’s tungsten alloys make them exceptional choices for radiation shielding applications, in both medical and industrial settings.

1) Shielding in medical

multi leaf collimator

shielding protection tank for medical radiation

shielding syringe for liquid medicine radiation

tungsten alloy containers, such as tank, box for storing radioactive materials

autocollimator and tungsten collimation bar for medical lineal accelerator, nuclear industry and container system inspection

shielding for Co60 and other radiation

gamma radiography shield

2) Shielding in industry

shielding block

flaw detector

large container inspection devices

radioactive source containers

Nuclear shielding wall etc.

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Tungsten alloy is used in many radiation-shielding applications including industrial, nuclear and medical.

Tungsten alloy is used in many radiation-shielding applications including industrial, nuclear and medical. Because of its high density and high atomic number, is an effective construction material for shielding against gamma rays and x-rays. Lead and boron carbide can shield radiation too, but cannot perform as well as tungsten alloy.

Tungsten alloy is a suitable raw material for tungsten alloy radiation container, because of tungsten alloy radiation container combination of radiographic density (more than 60% denser than lead), good machinability, good corrosion resistance, high radiation absorption (superior to lead), simplified life cycle and high strength. Tungsten alloy radiation shielding can provide the same degree of protection as lead whilst significantly reducing the overall volume and thickness of shields and containers. Moreover, compared with lead or depleted uranium, tungsten alloy is more acceptable in this case, for it is non-toxic and environmentally friendly material.

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Tungsten alloys is a best choices for radiation shielding applications, in both medical and industrial settings. Compared to traditional radiation shielding materials, tungsten alloys radiation shielding provide excellent value. A high-density alloy can provide the same energy absorption as lead using 1/3 less material. People are taking advantage of tungsten alloy's reliable radiation shielding properties.

Our tungsten alloys radiation shields are used for radioactive source containers, gamma radiography, shields, and industrial instrumentation. The radiation shielding is also serving as collimators and radiation shielding in cancer therapy, as well as syringe protection for radioactive injections.

The usage of tungsten alloy in radiation protection is not subject to NRC, EPA, or special OSHA regulations, so it has been widely used, such as:

Tungsten alloy radioactive source containers

gamma radiation shielding made by tungsten alloy
    
Shielding block of tungsten alloy
   
Source holders for oil well logging and industrial instrumentation
    
Tungsten alloy X-ray collimators
    
Tungsten alloy PET syringe shield
    
Shielding in cancer therapy machines
    
Syringe protection for radioactive injections
    
Tungsten alloy syringe shielding
    
Nuclear shielding wall
    
FDG container
    
Inspect welds
    
Nuclear testing equipment
    
Nuclear power plant shielding
    
Radiation shielding barrel
    
Isotope production, transport, and containment
    
Personal protection equipment for emergency responders
    
Large container inspection devices
    
Oncology Isotopic and accelerator based platforms
    
Pipe-line inspection Gamma
    
Defense for nuclear submarines

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