In order to increase the life of the bit, to increase the rate of penetration and to decrease drilling cost, a new type of  tungsten carbide diamond-enhanced composite button with high abrasive resistance and high toughness against impact, which may be used in percussion drilling, has been developed. The key problems in making the button are to improve the thermal stability of the diamond, increase the welding strength between the diamond and the cemented tungsten carbide, and reduce the sintering temperature of the tungsten carbide. All these problems have been solved effectively by pretreatment of the diamond, low temperature activation hot-press sintering.

The properties of the button have been determined under laboratory conditions. The test results show that its hardness is more than 86 HRA, its abrasiveness resistance is 100 times more than that of conventional cemented tungsten carbide. All these data theoretically that show the diamond enhanced tungsten carbide button has very good mechanical properties that can meet the needs of percussion drilling, and can solve the problems encountered with button bits of conventional cemented tungsten carbide.


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 & 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 button is also called cemented carbide button. It has many advantages like good wearing resistance, high abrasion resistance, high corrosion resistance, high tenacity, high temperature resistance, high hardness and high density. It is also the most suitable for hard rock. Tungsten carbide buttons are widely applied in geological prospecting, coal mining and oil well boring. Because of its wear resistance and 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. In recent years, tungsten carbide has emerged as a superior alternative to steel in many industrial applications.

Tungsten carbide buttons could mine quarrying coal-cutting, road construction, snow plow etc. It is fitting for serving as drill heads of heavy rock-digging machines, plum heads are used in deep hole drilling terrace vehicles. 


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 & 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 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:  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

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:  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 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:   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 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: 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
 

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: 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

Under a low temperature condition, the recrystallization will occur by adding some metals to the wire surface which is an important process when the wires act as reinforcement material in metal matrix composites because of its damage to the mechanical properties of non-sag tungsten wires.

The activated recrystallization was studied both for nickel plated and palladium plated 0.18 mm cold drawn doped tungsten wire. A recrystallized structure formed in both types of wires after annealing at 1100°C for 100 hours, but their structural features were different. Palladium presence will lead to recrystallizing behavior, which was very similar to that of un-doped tungsten wire, whereas the behavior of nickel plated wire was similar to the general recrystallization of doped wire, except for the much lower recrystallization temperature. This indicated that palladium was more effective as an activator than nickel was.

It was shown, using Atom Probe Field Ion Microscopy (APFIM) analysis, whose grain boundaries and lattice dislocations could act as fast paths for diffusion of activators in tungsten wire during annealing. The presence of the large potassium bubbles and the segregation of activators on potassium bubbles indicated that the effect of activators was to neutralize the impeding influence of potassium bubbles on dislocation movement and boundary migration.

Two types of nickel rich precipitates were found. One was a Ni (W) solid solution, which formed on the bubbles at grain boundaries, and another type, with Ni4W structure, was found on the potassium bubbles connected with dislocations. Palladium rich precipitates were present only in triple junctions. Their structure could not be established.

 

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

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: 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

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: 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