Tungsten carbide rotary burr is an effective way to realize mechanization in hand work operations. In the fields of airplane, ship building, automobile, machinery, chemistry etc., carbide rotary Burr can be widely used in machining iron, steel casting, carbon steel, alloy steel, stainless steel and copper aluminum etc.

1) Machining various kinds of metal.
2) Replacing small emery wheels, without powder pollution.
3) Increasing productivity of several ten times than using hand tools and three to five times than using small emery wheels.
4) Having ten times longer life than high speed steel Burrs and fifty times than small emery wheels.
5) Finish machining various kinds of die cavities.
6) Removing the Burrs of the castings, forgings and the welding spatter on the weld assemblies.
7) Chamfering angle, circular bead or flute on the mechanical components.
8) Chamfering or Burring the pipes.
9) Polishing the impeller channel.
10) Grinding the hole to an accurate shape.


Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten Picture Center: http://picture.chinatungsten.com
Tungsten Video Center: http://v.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com

Tungsten carbide tips and blanks are four times harder than titanium, twice as hard as steel, is virtually unscratchable, and has been widely used for decades in industrial applications such as cutting tools, mining machinery, and rocket engine nozzles. The extreme hardness of tungsten carbide tips and blanks makes them useful in the manufacture of cutting tools, abrasives and bearings, as a cheaper and more heat-resistant alternative to diamond. Tungsten carbide tips and blanks are also used as scratch-resistant material for jewelry including watch bands and wedding rings.


Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten Picture Center: http://picture.chinatungsten.com
Tungsten Video Center: http://v.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com

Brazing tungsten carbide is a very easy and reliable process if a few simple steps are taken but the steps are not necessarily obvious or widely known.   There are many additional articles on How to Braze in our Brazing index.

The carbide must be wettable, it must want to chemically and physically bond with the brazing alloy.   Clean tungsten carbide brazes well.   Tungsten carbide with any sort of oil, grease, oxide or free carbon on it will not braze.   You can clean carbide by grinding the surface with a sander or a bench grinder.  The simplest is just to specify that the carbide be wettable when you order it.   There are also companies that will treat the carbide and pretin it with brazing alloy so that it is ready to use when you get it.  

Test carbide parts for wetting or Brazeability.  Above are parts for a farm implement.   The manufacturer couldn’t get the carbide to stick to the steel.  He thought it was the chrome in the steel.  We put a small bit of brazing alloy dipped in Black flux in the middle of one steel part (left) and two carbide parts (right) and heated them with a torch.  You can see that the alloy flowed well over the steel and not at all on the carbide.   

The steel must be clean.  See our article on Cleaning Steel.   It used to be common to use vapor degreasing and very aggressive solvents to clean steal.  Most of the really effective solvents are now illegal so it is now common to use legal solvents that don’t work very well.    

The easiest way to test steel cleanliness is with an eye dropper or similar.  Put a drop of water on the surface and see what shape it forms.   The wider and flatter the puddle, the better.  A high, round shape means trouble brazing.

The best steel cleaner seems to be a strong caustic substance.   There is a wide variety of cleaners that work with varying degrees of success.  We tested about a dozen.   The cheapest and most effective was a barbecue and oven cleaner from the local janitorial supply.  For small parts we use a can of spray oven cleaner from the supermarket.

There are several brazing alloys used for carbide.  The classic is BAG-3, 50% silver with Cadmium.  This is an excellent product but does have Cadmium.  Commonly used is BAG-7, 56% silver with Tin, because it wets out readily however it is a very weak brazing alloy and joint failure is common with this alloy.  The strongest non-Cadmium alloy is BAG- 22, 49% silver with manganese, but it is a bit gummy in the flow.  BAG-24, 50% Silver, is Cadmium free and is a compromise.  It flows well but is about 40% weaker than BAG-3 and BAG-22.

We strongly prefer Black Flux although many braze successfully with White Flux.   In both cases they are clearly high temperature fluxes.    In addition we find that purified Black Flux gives better flow and stronger joints than ordinary Black Flux.  

The final area where mistakes are common is in joint design.   Trained welders commonly want to assemble the parts and then run a bead.  When they braze they want to assemble the parts and then wick the brazing alloy into the joint.

When brazing carbide it is often much more effective to flux the sides and bottom of the notch then put pieces of fluxed alloy wire under the carbide.  All you do then is to heat until the carbide settles in place.   

The standard should be that the carbide ruptures or the steel rips before the joint fails.  


Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: sales@chinatungsten.com
Tungsten Picture Center: http://picture.chinatungsten.com
Tungsten Video Center: http://v.chinatungsten.com
Tungsten News & Tungsten Prices, 3G Version: http://3g.chinatungsten.com

Emitting Principle

All incandescent light principle is the use of the object emitting heat and thermal radiation theory and principles to achieve the most simple to the filament incandescent lamp is turned on enough current, filament heating to incandescence, we will send light, but this incandescent lamp life will be quite considerable shorter.

We saw the reason for using the following incandescent technology, its purpose is to make incandescent lamps have a longer life and more convenient to use: Vacuum tube (to reduce the degree of oxidation filament), light foot (easy you will Bulbs inserted in the lamp holder), filled with an inert gas (reducing filament degree of oxidation at high temperatures), etc.

Working Principe

Halogen incandescent bulbs with the biggest difference is that the point is that the halogen lamp glass envelope is filled with some of the halogen element gas (usually iodine or bromine), which works as follows:

When the filament heats up, the tungsten atoms are evaporated to a glass wall direction, when close to the glass wall, the tungsten vapor is cooled to about 800 ℃ and halogen atoms combine to form a tungsten halide (iodide, bromide, tungsten or tungsten). Tungsten halide continues to move to the central tube, and oxidized back to the filament, as a tungsten halide is a very unstable compound and then re-heated steam into the halogen and tungsten, and the filament so that the tungsten deposited on, make up for being part evaporated.

By this recycling process, the filaments are not only greatly extend the service life (almost 4 times the incandescent lamp), and because the filament can operate at higher temperatures, resulting in a higher brightness, higher color temperature and higher luminous efficiency.


Tungsten Alloy 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

 

Halogen is late eighties successfully developed a new type of light source. It has a high luminous efficiency, small size, light weight, long life and other characteristics.

To make this small volume, high luminous efficiency light source is effectively a new application, the researchers turn into one kind of small halogen bulb made ​​of quartz glass with cold cup. The shape shown in Figure 2-8-2. The quartz glass halogen bulb cold cup and a combination of light called "quartz cold spot" (commonly known as cold light source, or cold light). It has a cold. Light into a beam angle of cold cup can
choose according to need, with a range of functions. Ordinary incandescent match.

Therefore, this light spotlights widely used in store mall counters. Windows for illumination and lighting effects.
Recent years due to the improvement of people's living standards, living conditions continue to improve. EL lighting decoration in the home has become increasingly popular. To enable people to live and work life, EL lighting is also widely used security products.

As cold working voltage spotlights are low voltage, 6V, 12V, power 20W, 50W, so in actual use step-down transformer must be used, generally 50W, 12V inductive transformer its large size and weight too, should not be in the mall lot of use. For this reason, scientists have launched an electronic transformer, which is characterized by: small size, light weight, low cost, easy to use and so on. Disadvantages are: electromagnetic interference (can increase its interference absorption circuit absorption). Electronic transformer circuit diagram: (12 * 8cm)
Working principle is basically the same, and electronic ballasts that the output voltage is reduced by the ferrite transformer isolation to the point of contingent Designed 12V.


Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online - http://www. tungsten-alloy 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

 

Halogen is thermal radiation source, the working principle is basically the same as with ordinary incandescent lamp, the structure has a larger difference. The most prominent difference is within the halogen bulb containing part of the gas filled halogen element or halides.

Halogen light efficiency higher (about 18 ~ 21lm / W), the lower the color temperature is generally 2700 ~ 3300K, CRI high color rendering index Ra 99 to 100.

Halogen Structure

Is a tungsten filament halogen, halogen-filled glass bulb and the lamp, and the like. Halogen lamp with double-ended, single-ended and double blister of the points;

Halogen Free

1 Press the charge into different halogen bulb for tungsten and bromine tungsten lamp;

2 Press the bulb housing material can be divided into hard glass halogen lamps, halogen quartz glass;

3 halogen at work can be divided into high and low voltage halogen mains (220V) and low voltage-halogen (6V, 12V, 24V);

4 halogen lamp according to the different structure can be divided into double-ended, single-ended halogen;

Halogen Works

When filled with halogen bulb powered substances when working out of the tungsten evaporates from the filament, and halogen compounds, forming a volatile halogen compounds. Halogen compound diffusion in the lamp, when spread to the area around a hot filament, a halogen compound into a halogen and tungsten, tungsten deposited on the release of the filament, and then continue to diffuse into the halogen lower temperature bulb wall region and tungsten compounds, forming halogen cycle.

Halogen Applications

Should pay attention to the following questions:

Halogen does not apply to low-temperature applications. Double ended halogen work, the lamp should be installed horizontally, tilted at an angle not more than 40, otherwise it will shorten its life; addition, since the halogen filament thin and crisp, halogen used, to avoid vibration and impact, and it is not as mobile lighting fixtures.


Tungsten Alloy 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

 

HIP (hot isostatic pressing)

1, HIP Treatment Summary

Powder metallurgy method is easier than the melting alloy is formed within the pores, although with advances in manufacturing technology, has been able to produce almost no pores, but at high pressure processing conditions of use, although the internal micropores is small, can make carbide tools damaged. In addition, for users that require extremely high reliability requirements, can be found in the existing material based on the increase HIP treatment, especially for the semiconductor industry uses progressive die, pin punch, encapsulation molds blanks, require a high material stability. Daijie the company 20 years ago to eliminate the use of the most advanced internal micropores HIP equipment to produce no internal defects of high quality carbide.

2, HIP Treatment Principle

HIP treatment is the principle of high temperature and pressure carbide placed in an argon atmosphere, so that destruction of the internal micropores, by changing the working conditions, HIP can significantly improve the bonding strength of carbides in the less binding agent timber species HIP better show results.


Tungsten Alloy 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

 

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.


Tungsten Alloy 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

 

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


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

 

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.


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