THE EFFECT OF VARIOUS ADDITIVES ON THE PROPERTIES OF TUNGSTEN,
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 13, 1969
- Accession Number
- AD0699650
Entities
People
- A. A. Kotlyar
- G. Z. Zamesova
- S. I. Ipatova
- V. N. Romanova
Organizations
- National Air and Space Intelligence Center