Tungsten Material

Details: Category: Tungsten Patents; Published on Tuesday, 22 January 2013 11:36

This invention relates to tungsten materials having improved ductility, a method of preparing the same and structural parts made of these materials.

The tungsten materials of this invention can be used for such applications as filaments for shock-or vibration-proof electric bulbs, cathode heater elements for electronic discharge tubes, grid electrodes for electronic tubes and filaments for common electric tubes and bulbs, which are required to have high resistance to high temperature deformation, shock-or vibration-proof strength and good shaping properties.

In connection with researches on tungsten materials for such applications, there have been developed a number of tungsten materials but none of them are fully satisfactory. The tungsten materials heretofore known include, for example, the type consisting of pure tungsten blended with aluminum oxide (Al2 O3), or the type blended with thorium dioxide (ThO2) or zirconium dioxide (ZrO2) in order to improve the thermal electron emissive properties for use as cathode electrodes of signal transmission tubes and the like, the type similarly consisting of pure tungsten alloyed with rhenium (Re) or molybdenum (Mo), or mixed with zirconium dioxide (ZrO2) and an element or elements of Group VIII such as iron (Fe), nickel (Ni), etc., and the type consisting of pure or thoriated tungsten blended with an element or elements of Group VIII such as iron (Fe), nickel (Ni) and the like.

These prior art tungsten materials, contain common doping agents for the purpose of improving the thermal electron emissive properties or the sagging properties by adjusting the particle size of recrystallized grains of tungsten.

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