OXYGEN BARRIER MATERIAL IN ANTI-OXIDATION COATING STRUCTURE FOR TUNGSTEN-RHENIUM THERMOCOUPLE AND APPLICATION THEREOF

摘要

The present invention belongs to the technical field of thermometry and provides an oxygen barrier material in a high temperature anti-oxidation coating structure for a tungsten-rhenium thermocouple and an application thereof. The oxygen barrier material has a multilayer structure with a total thickness of 50-200 μm. The oxygen barrier material in the multilayer structure has a composition gradient and concentration gradient. By adjusting the type of the material in each layer or the ratios between the materials, the coefficients of thermal expansion of the materials of respective layers of the oxygen barrier material gradually increase in a direction away from a tungsten-rhenium thermocouple base body, and the oxygen erosion resistances of the materials in respective layers of the oxygen barrier material also gradually increase in a direction away from the tungsten-rhenium thermocouple base body. Thus, the adhesive force of the high temperature anti-oxidation coating for a tungsten-rhenium thermocouple is increased, while the stress thereon is reduced.