99.95 polishing Tungsten Price Kg Tungsten Round Bars Price

Product DescriptionTungsten bar/rod is mainly used to found ingredient of material, cutter and heads, tungsten wire for lights instruments, electric contact points and conductor of heat, crankshaft and cylinder barrel of advanced automobile, ingredient of kinds of heat-resistant steel. Also used for making special steels, to make guns, artillery rockets, satellite airplane and ship. Tungsten bars have a luster rather like that of silver in uniform color. Though the whole tungsten bars may slightly curve, the maximum height of the bend should not be more than 7mm. The most popular application of tungsten bar is in steel making industry. Tungsten bars are used to improve the property of steel.Tungsten bar with impurities is used to procedure bulb filaments or electron tube filaments, which are guaranteed to have remarkable resistance to high temperature.
Porous Tungsten as a high current density cathode is one of the important applications of the metal, which is mostly used in high temperature conditions due to its exceptional resistance to melting (T-m = -3410 +/- 20 degrees C).Its porous form has been a crucial component of dispenser cathodes used in electronic valves and high power lamps. Porous tungsten skeleton forms the matrix. which is then impregnated with an electron emissive compound. Upon every emission front the surface, new material has to be fed into the surface pores via the open pore channels. Hence it may be proposed that a uniform porosity is needed for a better performance. However, a controlled porosity has not been achieved yet.Moreover, sintering of tungsten has always been difficult due to the extreme process conditions. A high sintering temperature (T-s >= 2000 degrees C) and a strong reductive atmosphere (hydrogen) have been the absolute necessity in making these parts. This study further explores an alternative sintering technique being developed. The idea is based on the reactive sintering concept. The energy output from the exothermic reactive system of tungsten oxide and aluminium has been the heat source for sintering porous tungsten. As a result, sintering temperature and time have been reduced considerably. Higher homogeneity, thus more uniform pore distribution, was observed.A better control of porosity related to the pressing and sintering conditions was achieved by the characterisation method previously developed. Microhardness has been a useful monitor of the scatter in porosity of the parts. Throughout the study, SEM was used to observe the porous Structures and powder morphologies. DSC and XRD were useful to follow the microstructural evolution in the reactive system.
products99.95 polishing Tungsten Price Kg Tungsten Round Bars PricePurity≥99.95%TechnologyPowder SinteringMaterialW1,W2Surface TreatmentGrindingDimension (mm)OD 3.0 ~ 12 mm Lenght 800 mm-1000mmTotal Porosity 40% Max.Applicationelectrodes in the field of rare earth metal industryChemical CompositionTungsten Fe Ca P Sn Al Ni N Sb
W1 0.001 0.001 0.0010.0001 0.00010.000350.002 0.0001Balance Bi Mo Mg C Si O Pb As99.95%0.0001 0.00080.00010.00085 0.001 0.00470.0001 0.0001Finished FormSpecified Diameter (mm)Min.Length (mm)Diameter TpleranceWroughted2.8≤d<5.0 600 +/-2%5.0≤d<6.5 3006.5≤d<11.0 200
Straightened0.8≤d<1.01000+/-2%1.0≤d<3.0 800
Ground0.8≤d<3.0800~1000+/-0.03 mm3.0≤d<6.5300~600+/-0.03 mm6.5≤d<10.0200+/-0.03 mmApplicationSuitable for producing ion implantation parts;For producing electric light source parts and electric vacuum components;For producing heating elements and refractory parts in high temperature furnaces;Used as electrodes in the field of rare earth metal industry.

Advantages:
1.High density.
2.Good mach-inability.
3.Good mechanical properties.
4.High Modulus of elasticity.
5.High absorption capacity against x-rays and y-rays.
6.Harmless and environment friendly.
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