Accession Number : AD0699650

Title :   THE EFFECT OF VARIOUS ADDITIVES ON THE PROPERTIES OF TUNGSTEN,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Romanova,V. N. ; Ipatova,S. I. ; Kotlyar,A. A. ; Zamesova,G. Z.

Report Date : 13 SEP 1969

Pagination or Media Count : 17

Abstract : The effects of rare and rare earth metals on the properties of tungsten (containing silicate additive), on the thermoemission properties, and on the welding characteristics of tungsten were studied. Compositions containing tungsten, silicate and rare or rare earth metals were prepared from tungsten anhydride, potassium silicate (0.45 percent) and oxides of Zr, Be, B, Hf, Ti, Gd, Nd, Y, and Yh (within range of 0.01-0.5 percent); the obtained metal powders were molded, extruded into wire, subjected to recrystallizing annealing at 240 C, and subjected to 0.67 kg/cm(superscript 2) load under vacuum at 2500C. Of all the examined additives, only the boron oxide (added as borax) had positive effects on tungsten properties. The 'nonsagging' properties of tungsten composition containing 0.2 percent B plus 0.45 percent SiO 2 as K 2 SiO 3 plus 0.6 percent KC1, are similar to those of tungsten VA, but the new composition does not have any particular advantages over tungsten VA. This composition can be used as the incandescent body in lamps, but is at a disadvantage when considered for Welding rods. (Author)

Descriptors :   (*TUNGSTEN, *ELECTRODES), ADDITIVES, RARE EARTH ELEMENTS, WELDING, THERMIONIC EMISSION, LIGHTING EQUIPMENT, USSR

Subject Categories : Electrical and Electronic Equipment
      Metallurgy and Metallography

Distribution Statement : APPROVED FOR PUBLIC RELEASE