Quantitative Phase Analysis of Mixtures Containing α‐, β‐Tungsten and WO₂

Abstract

For incandescent lamp wire fabrication various powder metallurgical steps are necessary. The stepwise reduction of WO, t o the tungsten metal powder is one of these.Diiring reduction chemical reactions take place under participation of doping elements (K, Si and Al) causing the structure of non-sag wires. The origin of secondary p-W like an indicator for the activity of dopings has been attributed importance. Therefore it has been developed a method for quantitative phase analysis of a-W, 8-W, WO, mixtures consisting of oxidation value determination to establish the WO, content and X-ray phase analysis for a quantitative separation of the a-W and ,9-W content. The influence of extinction effects caused by particle size has been investigated and i t is proposed a correction method of the measured integral intensities as a function of half-width of the (110)