Hot strength properties of filamentary nickel alloys

The results of an investigation of the hot strength properties of several nickel- and cobalt-based alloys are given. These materials, having as minor constituents such elements as aluminum, tungsten, chromium, etc., were chosen for their possibilities as efficient primary electron emitters (when coated with alkaline earth oxides). The diameters of these filaments were all 0.001 inch or less. The general term hot strength is defined as both resistance to flow and as time to rupture at temperatures approximating tube operation. A stress range was chosen so that accelerated conditions prevail, and a measure of the relative strengths of a variety of filamentary alloys is thereby practicable.