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.

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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.

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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.

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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 .


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