Functionally Graded Oxide Scale on (Hf,Zr,Ti)B₂ Coating with Exceptional Ablation Resistance Induced by Unique Ti Dissolving.

ABSTRACT: Multicomponent Ti-containing ultra-high temperature ceramics (UHTCs) have emerged as more promising ablation-resistant materials than typical UHTCs for applications above 2000 °C. However, the underlying mechanism of Ti improving the ablation performance is still obscure. Here, (Hf,Zr,Ti)B₂ coatings are fabricated by supersonic atmospheric plasma spraying, and the effects of Ti content on the ablation performance under an oxyacetylene flame are investigated. The (Hf_0.45Zr_0.45Ti_0.10)B₂ coating shows superior ablation resistance and cycling reliability at ≈2200°C. A functionally graded oxide scale comprising an outer dense layer and an underlying fine granular layer formed. The former is a better oxygen barrier owing to fewer cracks and

SUBMITTER: Lv J 

PROVIDER: S-EPMC11904937 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature