Neutron radiation is a kind of ionizing radiation which consists of free neutrons. A result of nuclear fission or nuclear fusion, it consists of the release of free neutrons from atoms, and these free neutrons react with nuclei of other atoms to form new isotopes, which in turn may produce radiation.

Due to its high density, excellent absorption behaviour against radiation and environmental friendly characteristics, tungsten alloy can be widely used produce neutron tungsten radiation shielding. Neutron tungsten radiation shielding can be used in select facilities to treat cancerous tumors and damaging nature to cellular structure. Neutron tungsten radiation shielding can also be used in the nuclear industry, the space and aerospace industry, as well as the high reliability explosives industry.

  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
 

Non-sag tungsten wire with poor diameter consistency will lead to poor photoelectric parameter of incandescent bulbs, and some will affect the life of the lamp. Non-sag tungsten wire can used for the production of incandescent lamps filament and tungsten halogen lamps filament, and gas discharge lamp filament electrodes, a small number of non-sag tungsten wire is applied to high-temperature furnace for heating materials, tube heater and the composite material stiffener. Use as a gas discharge lamp cathode, in order to reduce the electron work function, should add 0.5 to 3% of thorium, called thorium tungsten wire, to non-sag tungsten wire or tungsten rods. Because Thorium is a radioactive element, and can pollute the environment, cerium rather than thorium is used for making tungsten cerium wire or tungsten cerium rod. But the evaporation rate of cerium is high, tungsten cerium wire or tungsten cerium rod can only be applied in small-power discharge lamp. Tungsten becomes very brittle by high temperature recrystallization, and it can easily break in case of a shock or vibration. In some of the requirements of high reliability electric lighting products, in order to prevent wire breakage, we often add 3 to 5% of rhenium, called tungsten-rhenium wire, to non-sag tungsten wire, which can make the extension of tungsten brittle transition temperature drops to room temperature or below. This is a very strange effect of rhenium, has not yet been able to find a substitute element to produce the same effect. At room temperature, tungsten has good acid and alkali capacity, but in the humid air it is easily oxidized, so fine tungsten wire can not be stored for too long in a humid environment. Besides, tungsten begin to react with carbon at 1200 ℃ and down, so we should pay attention to this issue when we are burning hydrogen treatment of filament, or graphite lubricant will react with tungsten and the wire would become brittle fracture.

 

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 shows its performance on wire winding performance at room temperature performance.

Because of its long processing flow, if the process is mismanaged, it is very easy to produce a lot of tiny cracks or will lead to local brittle, so when reeling it will easily break. Since the crack caused by the fracture was about to be hairy wire breakage, because the wire becomes brittle and fracture caused by flash-like crystal plane is rendered.

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 working temperature is often between 2300 ~ 2800 ℃, generally , the greater the average light bulb power, the higher the wire temperature. It shows that the wire temperature far exceeds the recrystallization temperature of tungsten, at this time, wire is under its own weight, the wire segment between two hooks will produce sagging, and if it is serious, the wire will collide with the glass bulb. In the process of tungsten powder metallurgy, non-sag tungsten wire dope a small amount of potassium oxide and aluminum oxide, although the content of silicon and aluminum is only a few parts per million and the potassium content is tens of parts per million in its final product, non-sag tungsten wire sagging degree has greatly improved. The reason is because the recrystallizing structure of the non-sag tungsten wire is very different from sag tungsten recrystallization structure. Sag tungsten crystal recrystallization essentially is an isometric crystal, while the non-sag tungsten wire crystal structure represent elongated strip whose coarse grains is overlapping each other. From the high-temperature creep theory of metallic materials, the latter kind of crystal structure can greatly enhance the non-sag ability of tungsten at high-temperature.

 

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 is added strengthening elements (such as, potassium, silicon) to increase its resistance to high temperature creep properties.
Non-sag tungsten wire production process includes several major processes: doping, reduction, profiling, sintering, annealing, and stretching.
Use ammonium paratungstate (APT) as raw material. Generally the process is: sintering APT into tungsten trioxide at a temperature of 500 ℃ around in the air, or make a slight reduction to blue tungsten oxide in hydrogen at 450 ℃ around. The production of incandescent wire of tungsten wire needs to dope a small amount of potassium oxide, silica and alumina into tungsten trioxide or blue tungsten oxide, and the total amount of the three is less than 1%, the tungsten doping process, which is invented by Baez in 1922. After reduction process, the doped tungsten oxide will reduce to tungsten powder with hydrogen. Reduction process is generally carried out in two steps: the first step is reduced to tungsten oxide at about 630 ℃, the second step is in the reduction of a metal tungsten powder at about 820 ℃. The purpose is to make a two-step reduction of potassium incorporated into fully play the role and control of particle size. Such doped tungsten powder and then get compressed into an elongated square bars in a special mold. The square bars in hydrogen powered, with self-resistance heating (at temperature of about 3000 ℃) method sintered, tungsten sintered density can reach more than 85% of the theoretical value. Using the method of swaging, this tungsten can be processed into tungsten rod,whose diameter is about 3mm. Then further procession is drawing with a mold into a variety of different thickness of the tungsten wire.

 

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

To further understand the industry non-sag tungsten tensile properties and fracture mode, we study the effects of grain size after annealing process and process of drawing and the impact of temperature at 300-1300 ℃ annealed tungsten wire. Machining and annealing of the grain size of the tungsten wire sagging against the tensile properties have the following implications:

Produced by conventional methods, the grain sizes are two samples: 50 and 105μm, the strength and elongation are actually the same.

By powerful drawing process obtained φ0.24mm tungsten wire (drawn by the φ1.0mm made of tungsten), the strength and elongation has clearly improved.

Tensile fracture mode is divided into three, splitting, cracking and splitting fiber - fiber crack mixed fracture, and fracture strain as the actual value and the annealing temperature changes and different.

 

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

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 process on high temperature with good non-sag properties and anti-shock performance? Non-sag tungsten powder metallurgy preparation stage has a critical effect on the temperature and anti-shock resistance of tungsten wire:

At a temperature of 260 ~ 460 ℃, and hydrogen flow rate is 0.3 ~ 0.5m3 / h , using ammonium paratungstate(APT) (with good flow properties , impurity content of less than 50ppm, grain morphology of monoclinic hexagonal structure) to obtain a tungsten blue oxide with a particle size of 9.1μm in restore conditions.

At 550 ~ 870 ℃, adding K, Si, Al, Co elements to tungsten blue oxide, through a two-stage reduction, obtained tungsten powders of different particle size, think that B: D powder is 4: 6 ratio of the tungsten powder with a particle size normal distribution, the most beneficial to get a good high temperature non-sag tungsten wire properties and seismic 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

Tungsten Carbide Square Rod

Tungsten carbide square rod is a shape for square, and it is a kind of rod. Tungsten carbide square rod is a hard, brittle ceramic which, when combined with 6% to 10% Cobalt, forms a tough cermet. Tungsten carbide square rod can withstand the high compressive stresses imposed during cutting, as well as having good wear and oxidation resistance at the high temperatures reached. Tungsten carbide square bar has a high resistance to thermal shock, so is able to withstand the rapid temperature fluctuations. Also, this has found a use as electrodes for Electrode Discharge Machining (EDM).

Tungsten carbide square rods are available in a wide selection of micro-grain and sub-micron grades that are engineered to stand up to thermal extremes, vibration, and impact wear. The tungsten carbide square rod that can be ground to h6 tolerances a variety of grades that provide exceptional wear and impact resistance grades for use in end mills, reamers, drills, countersinks, engraving tools, routers, and other rotary tools.


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 Square Rod Application

Tungsten carbide square rod has good red hardness, high hardness, high wear resistance, high pressure resistance, high oxidation resistance, low coefficient of expansion, fine electric and heat conduction. Due to all these advantages, it is widely used in many industries like wood industry, electrical industry, metal industry and other industries where high hardness and high wear resistance is required.

Tungsten carbide square rod application includes cutting and drilling tools (such as micron drills, twist-drills, vertical mining cutter index able file), typing needles, rollers various wear parts and structural materials. Besides, it can be extensively used in many fields, such as mechanical, chemical, petroleum, metallurgical, electronic and national defense industry. Tungsten carbide square bar has a high resistance to thermal shock, so is able to withstand the rapid temperature fluctuations. Also, this has found a use as electrodes for Electrode Discharge Machining (EDM).


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 Square Rod Properties

Tungsten carbide square rod has good red hardness, high hardness, high wear resistance, high pressure resistance, high oxidation resistance, low coefficient of expansion, fine electric and heat conduction. Due to all these advantages, it is widely used in many industries like wood industry, electrical industry, metal industry and other industries where high hardness and high wear resistance is required.

Below is the tungsten carbide square rod properties of different grades:

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