Tungsten alloys and finished component parts are used in a variety of diagnostic and therapeutic medical technologies. High-density alloys for multileaf collimators are used to comprise the individual leaves, which can move independently in and out of the path of a particle beam.

The density and strength of tungsten alloys make them the first choice for multileaf collimator applications. Their energy-absorbing qualities are excellent choices to protect sensitive electronic equipment, as well as delicate human tissue. Tungsten alloys are used for radioactive source containers, gamma radiography, syringe shields, oncology treatment systems and oncology instruments. Tungsten alloys provide unsurpassed strength, control and environmental protection.

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  This email address is being protected from spambots. You need JavaScript enabled to view it.
  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

The tungsten micro multileaf collimator (mMLC), is unique in having four sets of leaves, instead of the conventional two. Tungsten micro multileaf collimator has cross-leaves with 96 tungsten alloy leaves in 4 banks.

The advantages of 4-bank tungsten multileaf collimator:

Fast tracking: for parallel tungsten alloy leaves, aperture motion is determined by the time required to cover/uncover target edges parallel to leaf motion and by leaf speed. Since there aren't any such target edges for cross leaf - aperture formation, time is consequently several times faster than that of a parallel tungsten leaf collimator. In addition, cross tungsten alloy leaves smaller weight and lower friction enable higher leaf speed and reliability then conventional mMLCs.

Improved conformity: Cross tungsten leaf conforms better to complicated targets (e.g., doubly concave) and eliminates collimator rotation. Conformity is significantly improved even for a regular shape.

  Tungsten Alloy Manufacturer & Supplier: Chinatungsten Online- http://www.tungsten-alloy.com
  Tel.: 86 592 5129696; Fax: 86 592 5129797
  Email:  This email address is being protected from spambots. You need JavaScript enabled to view it.
  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 carbide roughing end mills refer to the cutting tools with a wavy cutting teeth at the business end, and on the sides, which are the most popular tools for quickly removing large amounts of materials in a vertical mill.

By adopting this end mill in machining, the work pieces will finish with rough surface, due to the wavy teeth on the periphery of the tungsten carbide roughing end mill create many successive cutting edges generating lots of tiny chips.During cutting, multiple teeth are in contact with the workpiece reducing chatter and vibration. Rapid stock removal with heavy milling cuts is sometimes called hogging. Specially, roughing end mills are also known as ripping cutters.


Tungsten Carbide Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten-carbide.com.cn
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:   This email address is being protected from spambots. You need JavaScript enabled to view it.
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 oxide has good physical and chemical properties, so it can be widely applied in many different fields. Its ultra-fine powder has a strong absorptive capacity of the electromagnetic wave, so it can apply in solar energy field which can be an absorbing material, and in the military field it is an important stealth material. And tungsten oxide has a special catalytic properties in the fuel cell can be used as the anode electrode catalytic materials, as well as can be low-temperature superconducting materials, but also often doped with TiO₂ as a photocatalyst and so on. Tungsten oxide film based on tungsten oxide powder material having a broader application, it can transform it presents color when giving appropriate optical radiation or using electric field. And this is photochromic or electrochromic. And at present these technologies are widely used in electrochromic windows, large information displays, and automotive mirrors and so on. Meanwhile tungsten oxide for NO_X, H₂S, NH and other gases are highly sensitive, so as a sensitive material of the sensor can be used for detection of food, medicines, and other exhaust. Tungsten oxide active apply in different fields, so the study of the tungsten oxide still continue to carry out, and it has also become one of the most potential for development of materials.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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
 

With the rapid economic development, national defense, transportation and other industries are gradually increasing their demand for high-performance anti-shock non-sag tungsten wire (not easy to sag and difficult algorithm of fault). How to prepare the production process based on the common non-sag tungsten wire on a high resistance to high temperature with good non-sag properties and seismic performance of sag tungsten wire? Sag tungsten powder metallurgy preparation stage has a critical effect on the temperature and anti-shock resistance of tungsten wire:

At 85% frequency current slow, heating with a two-stage sintering to obtain a sintered tungsten bar of external dimensions of 15 × 15 × 400mm, the density of 17.2g / cm3, grain size 7 to 8, the bar which have excellent high temperature performance and a good workability and resistance to shock cobalt-doped tungsten, of course, preferably slow heating temperature is best. Mechanism of cobalt tungsten improve the seismic performance of tungsten and cobalt-doped billet in the process of plastic working (swaging, stretching) changes of microstructure and properties were studied,  cobalt can improve K to penetrate the metal tungsten matrix is ​​reduced tungsten grains oxygen content, improve the seismic performance of the tungsten wire; tungsten wire with plastic processing depth increased density, tensile strength and work hardening increase, was with the processing of high-yield, high-temperature tungsten good performance.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 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

Non-sag tungsten wire, namely doped tungsten wire, which is widely used in electronic devices and hot wire, such as, high wire color temperature, thermal shock resistance wire and the cathode tube radiation. Its development could date back to 1920. Its large elongated grains are obtained by primary and secondary recrystallization, which are regarded as the desired microstructure to gain necessary creep resistance.

Non-sag tungsten wire of incandescent bulb is usually used at the temperature of 2600 ℃around, and the bulb requires the wire to ensure that it owns stable organization and unique high temperature resistance performance. The value of doped tungsten wire anti-sag resistance is an important parameter to evaluate high-temperature performance of tungsten wire. In recent years, studies have been continuing to report about the physical state of doped tungsten microstructure, and bubble reinforcement theory now is widely used to study high-temperature properties of tungsten wire. Long-term creep at high temperature conditions, required the gas atoms of strengthening effect must be insoluble, and has a sufficient vapor pressure, while the element content must be small, so as to ensure the formation of a dispersed state. In doped tungsten wire manufacturing process, aluminum and silicon in aluminum - silicon - potassium dopant, substantially soluble in the matrix, but there are large differences in potassium and tungsten atomic radius, potassium with greater atomic radius diffusion capacity in tungsten is bad. However, the tungsten in the processing and recovery temperature ranges, the vapor pressure of elements potassium is large, so can guarantee a solid solution in tungsten.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 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

From tungsten trioxide particle morphology we know tungsten trioxides partial are denser. And it is bad for hydrogen enter particles interior during reduction process, and the interior water is not easily discharged. Based on the oxidation-reduction deposition growth mechanism, which will help tungsten powder particle to growth, thus tungsten trioxide is suitable for produce coarse particles of tungsten powder, which is the actual situation of our industrial production.

With the reduction processing, the oxygen and vacancies of tungsten trioxide increase then a tungsten trioxide crystal partial gradually transformed into a β- tungsten oxide crystal partial. β-tungsten oxide particle morphology has some different with tungsten oxide particle shape which isβ-tungsten oxide particle more coarse and there has some cracks. The cracks depends on reduction temperature, reduction time, the speed of push the boat, boat mounted volume, hydrogen flow rate, and hydrogen-way. These cracks is good for water discharge and hydrogen into the interior of the particle so than it can make further depth reduction, and it also good for produce fine tungsten powder.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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

Non-sag tungsten wire working temperature is between 2300 ~ 2800 ℃, and the greater the average light bulb power, the higher the wire temperature.

According to a series of study and analysis conducted by Transmission Electron Microscopy (TEM) and Auger Spectrometer (AES) in 1970s, it shows that non-sag tungsten wire recrystallization structure, unique, with elongated strip whose coarse grains is overlapping each other, its formation is closely related to potassium content. Remaining trace potassium in doping tungsten bars form potassium bubble column which parallel to the axis of the filament during processing, and then hinder the process of lateral recrystallization grain growth, and thus generate long thick overlapping structure. Incandescent wire sagging is not only related to the additive element content and machining technology, but also the treatment process of wire production process. Tungsten retains a large number of internal stresses in finished products when we pulling it into wire, and will produce new internal stress of inhomogeneous deformation in the cross section of tungsten wire when we are winding the wire. The internal stress must eliminate thoroughly before tungsten wire is placing into the glass bulb, otherwise bulb will start twisting, distorting and sagging when it is lit. When the wire is sagging, it can severely reduce the luminous efficiency of the lamp.

 

Tungsten Metals Manufacturer & Supplier: Chinatungsten Online - http://www.tungsten.com.cn
 Tel.: 86 592 5129696; Fax: 86 592 5129797
 Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
 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

Sol-gel method for manufacture tungsten trioxide films has a lot of advantages, such as it can be produce different crystal structure material, different degrees of dense material, and easy to control the product's composition and particle size. The most important it can produce large area and uniform films. Thanks to these advantages, it is used by mostly researchers to study and continue to develop. In 1999, researchers use sodium tungstate as reaction precursor and in the different PH value to produce WO3 films. Then with the increasing of PH value, tungsten oxide hydrate gradually change to octahedral 12- tungstate, and this is conducive to the low valence W atoms formation and photochromic pheromone occurs. After that researchers who prepared the same way, produced several hybrid multi-metal oxide film in which phosphorus tungsten oxide film after exposure to UV light in the visible and near infrared region to have a strong absorptive capacity. The method for the sol - gel method large tungsten trioxide film has taken an important step. By 2002, using tungsten hexachloride and tungsten acid as raw materials, by changing the alcohol, water and the proportion of PH value polyethylene glycol to obtain a stable sol, and made into a film. The hybrid films which are using WCL6 as raw material to produced and it has fast response, strong absorption advantages.

Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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 Carbide Rod Hardness Test

Tungsten carbide rod hardness test mainly adopts Rockwell hardness tester to test HRA hardness level. The portable Rockwell hardness tester weighs only 0.7kg which is really convenient both in usage and carry. Through the hardness test, we can figure out the different mechanical property of tungsten carbide rod under different chemical agents, organization structure and heat treatment processing. This is a kind of non-destructive test, and is relatively easy to operate. This kind of detection method has small testing force and little indentation, high measuring speed and high efficiency; therefore, it can be directly used to test finished products.

Hardness test has certain similarities with tensile test, both of which are used to test the resistance capability of metals to plastic deformation. Because tensile test is a kind of destructive test, so hardness test is adopted more frequently than tensile test.


Tungsten Manufacturer & Supplier: Chinatungsten Online - http://www.chinatungsten.com
Tel.: 86 592 5129696; Fax: 86 592 5129797
Email:  This email address is being protected from spambots. You need JavaScript enabled to view it.
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