Behavior of Selected Commercial Alloys During High Temperature Oxychloridation

Abstract

Alloy performance at high temperatures In halogen-containing atmospheres is often limited because of the low melting and highly volatile reaction products. Results of 50 h tests in oxidizing atmospheres of air-2% chlorine at 900 and 1000 C (1652 and 1832 F) are presented, and the alloy performance is ranked according to metal loss and internal penetration. Attention is given to surface morphologies, in particular the beneficial role of alumina scales in such environments. These results, which include comments on chromia-forming alloys and the more damaging influence of refractory elements such as molybdenum and tantalum, permit further understanding of the effect of halogens on materials at elevated temperatures.