Tungsten carbide is an extremely hard and durable metal that's used for everything from industrial applications to men's jewelry. A combination of the extremely hard metal tungsten and carbide mixed together with another metal binding agent, tungsten carbide can a hardness of up to 9.5 on the Moh's scale (not very far below diamond, which is the hardest on the scale). Tungsten carbide is also chemically inert, and will not rust or react with other chemicals. Naturally a steel gray color and coming in a powdered form, tungsten carbide can be molded and shaped through extreme heat and pressure into a variety of shapes and forms.

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

There aren't many ways to tell just by looking at a ring whether or not it's pure tungsten carbide or a tungsten carbide and cobalt combination. The price is one of the most telling features, because rings made with cobalt are usually cheaper in price. The best way to make sure that you have a genuine tungsten carbide ring is to get a guarantee from the manufacturer, so that if your ring does have cobalt in it you can get a replacement at little or no charge.

Tungsten carbide rings are extremely strong and durable, and the same goes fortheir "permanent" finish. Pure tungsten carbide rings don't dent, scratch or loset heir shine very easily. A tungsten carbide ring with cobalt in it will, however, so if you've bought a tungsten carbide ring that's lost its shine, even after a thorough cleaning, chances are there's cobalt in it.

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

There are a lot of downsides that come along with a tungsten carbide ring that has cobalt in it. For one thing, while you wear it, the cobalt in the ring will react with the natural oils produced by your skin. Cobalt rings will change your skin color, and over time they'll develop permanent oxidation spots that you'll never be able to scrub away. The rings might look nice at first, but within a week to a month depending on how much you wear it, the chemical reactions will occur and ruin its look.

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

Many rings that claim to be tungsten carbide are actually cobalt and carbide, or a mixture of tungsten, cobalt and carbide. Cobalt is much easier to form a bond with, and the forging can be done at a lower temperature for less cost.

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

Tungsten carbide in its normal form is nothing more than a powder. Both tungsten powder and carbide powder have to be brought together and forged at very high temperatures to create the necessary bond that will result in a tungsten carbide ring. This process can be difficult and expensive, but it yields a high-quality product that will last for a long time.

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

Tungsten carbide in its normal form is nothing more than a powder. Both tungsten powder and carbide powder have to be brought together and forged at very high temperatures to create the necessary bond that will result in a tungsten carbide ring. This process can be difficult and expensive, but it yields a high-quality product that will last for a long time.

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

Tungsten carbide has become one of the more popular nontraditional rings. Known for its strength and durability, the symbolism of tungsten carbide in wedding rings is undeniable. However, there are a number of rings on the market that are made using cobalt, rather than tungsten carbide, and that can create an entirely different sort of ring.

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

In 2007, the New England area experienced a scare after published reports suggested that tungsten had leached into various waterways. Certain compounds of the tungsten element show signs of toxicity.

Classification
Tungsten falls into the heavy metal category under the VIB group on the periodic table. Tungsten displays an extreme melting point as well as a high density. Tungsten has the ability to form a vast variety of compounds.

Warning
Various compounds of the metal tungsten have been proven to show signs of toxicity. Some of the most common toxic compounds of tungsten include nitrides, silicides, borides and oxides. Elemental tungsten often gets confused with the compounds of tungsten that display toxic characteristics. Finding elemental tungsten in a water system does not warrant an alarm as the toxicity of the elemental form of tungsten remains insignificant.

Leaching
Tungsten in its pure metallic form can not leach into water. Elemental tungsten has an insoluble composition when introduced to water. Tungsten also has a density 19 times greater than the density of water, making the transportation of tungsten by water nearly impossible.

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 excellent performance , the traditional W-2% ThO2 electrode is a widely used hot cathode material , swaging method is a widely used method of industrialization . Swaging method , also known as radial or rotary hammer forging method , it is actually a special form of forging . Swaging machine works by two or more blocks of one hand forging die forging billet axis surrounded by high-speed rotation , on the other hand on the billet for forging, forging a frequency of approximately 6800 to 12,000 times / min, thereby the billet deformation. Melting down the sintered article W , first through swaging , and then stretched to the required finished wire . Swaging and drawing , has the following advantages: ( 1 ) The stress state is good. In the rotary forging , the billet at a reasonable process conditions by three to compression stresses, swaging force changing periodically , but not outside the friction . More moderate deformation of the metal , so suitable for processing low plasticity billet ; ( 2 ) Can effectively improve the microstructure and properties of metals . With coarse and fine grain cross porous vertical melt distribution billet by swaging broken into fine grain , and with the mouth of the total increase in the degree of deformation , the messy arrangement of porous vertical melt coarse grain structure gradually transformed into dense aligned fine grain structure . Therefore, the metal density , plasticity and strength and so has been significantly improved, so as to produce qualified Rod and smoothly brushed created favorable conditions ; ( 3 ) Swaging blooming with other methods ( eg , rolling method and extrusion method ) , also has equipment compact and easy to operate , as well as the advantages of low consumption deformation . In the rotary forging process, due to the deformation of the blank is not reactive, and friction , and thus the required motor power is only about 1.5-2.0kW .

However , the material processed by swaging , W cathode of the rod-shaped or needle ThO2 , as coarse grains , serious deterioration of the cathode performance. Authors' by high energy ball milling , and then sintered , a new nano-composite W-2% ThO2 cathode material was developed to put success. The materials ThO2 particle size less than 100nm, showing better than the same grade commercial arcing electrodes and anti- arc ablation performance. However, as the process is less than the maximum compressive stress 50MPa, so the relative density of the material is only 94.5% , much lower than the conventional cathode ( fully dense ) , fracture toughness is also poor. The disadvantage of the method is the high cost , not suitable for industrial production. Thus , limiting the application of this new cathode material .

In order to make the performance of this material has been further improved , the authors were prepared using swaged nanocomposite W-2% ThO2 cathode material , and to explore the possibility of industrial production , it truly out of the lab .


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

Raw Material

Experimental materials used for the business of W powder and ThO2 powder, W powder grades for the GW-06, a purity of 99.6%, an average particle size of about 0.6μm. The Th (NO3) 4 from the thermal decomposition, Fei average particle size of -300 mesh, 99.5% purity.

Equipment and Process Parameters

High-energy ball milling equipment for the German Simoloyer01-2LM type horizontal mill, like this:
this type of high-energy ball mill Simplified and stirring rod made ​​of special wear-resistant alloy, balls made ​​of bearing steel, spindle speed and the milling process are computer controlled milling time, milling can be used in inert gas or in a vacuum state. This type of high-energy ball milling with high efficiency, uniform particle size, and low impurity content. Ball Mill inner diameter of 146mm, ball diameter of 5mm. The aviation gasoline was chosen as the grinding media and through the circulating water cooling protection.

Milling time and the amount of energy is kinetic energy ball milling determinants made ​​of powder on the granularity of uniformity and impurities play a decisive impact. These factors have an impact on the high-energy ball milling process parameters as rotational speed, ball feed ratio, milling time, nature of raw materials, materials and so gentle atmosphere. In this experiment, the milling process of adding aviation gasoline role is to improve the grinding efficiency, improve the lubrication conditions and reduce equipment wear and improve the uniformity of the powder, the powder to reduce pollution. In the milling process, through the grind at different time intervals to take powder, the powder particle size test, uniformity and impurity content, etc., through process optimization.

Mixture Process

Nanoparticles due to the large specific surface area and surface atoms ligand insufficient, with a strong surface activity and strong adsorption, making them easy to join together to form a weak-link interface with a plurality of larger size aggregates .

Swaging Process

Preparation of nanocomposite carved forging W-2% ThO2 electrode material of this test in Taebaek tungsten alloy plant, the specific process is as follows:
(A) mixing (2) Compression (3) pre-sintered (4) vertical melt sintering (5) swaging (6) drawing (7) straightening polished.


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