Journal
CORROSION SCIENCE
Volume 182, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109259
Keywords
Mechanical properties; Ablation resistance; Rare earth oxide; HfC-SiC coating; Carbon/carbon composites
Funding
- National Natural Science Foundation of China [91860203, 51727804]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JQ175]
- Fundamental Research Funds for the Central Universities [3102019TS0409]
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory
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The plasma-sprayed La2O3-modified HfC-SiC (HSL) coating exhibits superior ablation resistance and elastic modulus on SiC-coated carbon/carbon composites, primarily attributed to its unique structure and composition.
Plasma-sprayed La2O3-modified HfC-SiC (HSL) coating was prepared on SiC-coated carbon/carbon composites to obtain an elevated ablation resistance under a heat flux of 2.38 MW/m(2). The elastic modulus of sprayed HSL coating is about 140.97 GPa, 41.48 % greater than HfC-SiC (HS) coating. HSL coating also performed superior ablation resistance evidenced by integrated scale and stable ablation rates. Besides, the elastic modulus and adhesion strength of ablated HSL coating gained 65.9 % and 26.9 % increase compared with HS coating. Its reliable service performance is primarily attributed to the formed scale constituted by HfO2 and La2Hf2O7 particles encapsulated by La-Si-O glass.
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