Abstract Tungsten materials prepared by adding during the manufacture of powdered tungsten 0.01 to 2.0 percent by weight of aluminum oxide (Al2O3), silicon dioxide (SiO2) or potassium monoxide (K2O) singly or in combination on the basis of the tungsten, and 0.005 to 0.5 percent by weight of cobalt (Co) or tin (Sn) singly or in combination on the basis of the tungsten in such a manner that after mixture is sintered into a plate or wire, the final composition thereof comprises 0.0001 to 0.05 percent by weight of aluminum (Al), silicon (Si) or potassium (K) singly or in combination and 0.002 to 0.5 percent by weight of cobalt (Co) and/or 0 to 0.0005 percent by weight of tin (Sn) and tungsten and minute amounts of impurities as the remainder.
A sintered tungsten material according to claim 1 containing in total 0.0001 to 0.05 percent by weight of jointly added aluminum (Al), silicon (Si) and potassium (K) and 0.005 to 0.09 percent by weight of cobalt (Co) and particularly adapted for use as a tube wire.
Claim 2
Dependent Claim
26 words
A sintered tungsten material according to claim 1 characterized in that it can be formed into a heater element for use in an electron discharge device.
Claim 3
Dependent Claim
19 words
A sintered tungsten material according to claim 1 characterized in that it can be formed into a bulb filament.
Claim 4
Dependent Claim
27 words
A sintered tungsten material according to claim 1 characterized in that it can be formed into structural parts where the tungsten material has a high temperature ductility.
Claim 5
Dependent Claim
28 words
A sintered tungsten material according to claim 3 characterized in that it can be formed into a wire having an elongation of more than 8 percent before breakage.