A new anti-emission material for manufacturing of cathode-mesh electrodes

I. Melnikova, A. Lyasnikova, S. Maltseva

Abstract

The paper examines the properties of anti-emission materials, in which the mechanism of emission suppression is associated with the decomposition of a BaO layer. Oxide components diffuse into the surface layer, while barium, as a material with low work function, quickly evaporates from the surface of electrodes composed of anti-emission materials. Electrodes of the cathode-mesh assemblies are made of materials with recrystallization temperature of about 900°C, which is close to the working grid temperature. The newly developed vanadium based alloy VZrCNb10-1 is characterized by a higher recrystallization temperature of 1250°C. It is experimentally demonstrated that VZrCNb10-1 is capable of dissolving more oxygen without changes in the phase composition of the surface and significant changes in the mechanical properties. This alloy has a better ability to maintain the strength and technological characteristics during annealing in the vacuum of 6.65 · 10–3 Pa as compared to hafnium and ZrNb-25 alloy. VZrCNb10-1 is a high-strength heterophase material with carbide hardening and high strength about 60 kg / mm2 and has good ductility of about 15 %. VZrCNb10-1 allows for manufacturing components with small radii of curvature using deep-drawing methods maintaining fine-grained structure at the bend points with a high yield percentage. The studies show that at temperatures of the working mesh of 800, 1000, and 1100°C, the tensile strength of the VZrCNb10-1 alloy is 2.5 – 4 times higher than that of the ZrNb-25 alloy or hafnium. VZrCNb10-1 provides an at least twice enhanced durability of electron guns as, compared to the nodes with hafnium grids.

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