What Is Tungsten? Do You Know Tungsten Products?
Tungsten is a steel contains tungsten, and these tungsten products containing tungsten 18%.
Tungsten carbide, it is also called tungsten titanium. Its hardness is vickers 10K, and this hardness is after dianond. Just because of this, many tungsten products (common are made by watch) has worn characteristic.
Tungsten is often used to make lathe tools, impact driller, glass sword drill, electroplating and ceramic tile. It is solid annealing sticking, but not very brittle, so it belong to rare metal.
Tungsten powder sintering molding is pressing, sintering into blank heated to a definite temperature (sintering temperature), and maintain a certain amount of time (time), then heat and cool, in order to obtain the required performance of tungsten steel materials.
Tungsten sintering process can be divided into four basic phase:
1: removal and forming agent, burn stage at this stage sinter happen below:
Molding agent, the sinter early removal with temperature, molding agent gradually decomposition or vaporization, eliminate the sinter, meanwhile, molding agent more or less to sinter, increased carbon emissions. With the molding, quantity and sintering process of change. Powder surface oxides is reduced, in sintering temperature, hydrogen can restore cobalt and tungsten oxide removal in vacuum forming, if the agent and sintering, carbon and oxygen reaction is not strong. Powder particles. The contact stress gradually eliminate, binding metal powder began to reply and recrystallization, surface, press block diffusion began to improve strength.
2: solid-phase sintering stage (800 eutectic temperature) --
In the temperature, the liquid used on a stage except continue the process of what happened, solid instead should intensifies, plastic flow increase diffusion, sinter apparent shrinkage.
3: liquid sintering stage (eutectic temperature sintering temperature) --
When the sinter appears liquid, shrinkage, then produce crystals completed soon change, formed the basic structure and organization of alloys.
4: cooling stage (room) sintering temperature -
At this stage, the organization and the phase composition tungsten steel cooling conditions and with some change, can use this feature of tungsten steel heat to improve their physical and mechanical properties.
If want to know more about tungsten, please link: http://www.tungstenjewelryshop.com/
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