Kinetics of Oxidation of Pure Tungsten, 1150°–l615°C

Weight change and oxygen consumption measurements were used to study the kinetics of oxidation of tungsten from 1150° to 1615°C at oxygen pressures of 2–100 Torr. The data were collected in a static type reaction system. Volatilization of tungsten trioxide above 1100°C changed the nature of the oxidation reaction for temperatures between 1100° and 1250°C. At 1150°C and 76 Torr oxygen pressure, oxide scale formed and some tungsten trioxide volatilized, while at 1250 °C and 76 Torr oxygen pressure, all of the oxygen reacted to form volatile tungsten trioxide.