Non-sag tungsten wire
AssigneeGeneral Electric Company
InventorsJozsef Apagyi, Istvan Meszaros, Gyorgy Nagy, Robert J. Arena, Milan R. Vukcevich
Life of this patent
Estimating the term…
Abstract
The invention relates to non-sag tungsten wire for being used in light sources or heating elements, which tungsten wire is prepared from a tungsten block by powder metallurgy process with thermomechanical technique, and has an overlapped crystal structure after recrystallization and contains a dopant material. The essential feature of the tungsten wire according to the invention is that as the dopant material, it contains at least one of the following additive materials: lanthanum/III/oxide, cerium dioxide.
Claims5
A light source including a non-sag tungsten wire, said wire being comprised of tungsten and having an overlapped crystal structure and including between greater than 0 and 0.475 weight percent lanthanum (III) oxide.
A non-sag tungsten wire for being used in light sources which tungsten wire has a diameter of less than 0.4 mm, has an overlapped crystal structure and contains between greater than 0 and 0.475 weight percent of lanthanum (III) oxide or cerium oxide.
A non-sag tungsten wire for use in light sources, said tungsten wire having a diameter less than 0.4 mm and an overlapped crystal structure and containing between greater than 0 and 0.6 weight percent of the combined cerium oxide and lanthanum (III) oxide.
Dependencies are inferred from the claim text.