Oxidation of ZrB_2- SiC-ZrSi_2 ceramics in oxygen

摘要

The oxidation of ZrB_2-SiC and ZrB_2-SiC-ZrSi_2 ceramics of different composition has been studied experimentally at 1500℃ in pure oxygen for up to 50 h. ZrB_2-SiC-ZrSi_2 ceramics proved to be the most oxidation-resistant at ZrSi_2 contents of less then 4 wt%. These ceramics were more oxidation-resistant than ZrB_2-SiC ceramics. An analytical model of growth kinetics for a multilayered scale based on an oxidation-diffusion balance was developed and tested.