Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 42, Issue 14, Pages 6435-6444Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2022.07.016
Keywords
C; C composites; Chromium carbide; Coating; Oxidation resistance; Cr2O3
Categories
Funding
- China Postdoctoral Science Foun-dation [2019TQ0075]
- National Natural Science Foundation of China [52005131, 52125502]
- Heilongjiang Provincial Postdoctoral Science Foundation [LBH-Z19142]
- Heilongjiang Touyan Innovation Team Program [HITTY-20190013]
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By using a novel reactive wetting strategy, a chromium carbide (Cr-C) coating in-situ formed on the C/C substrate is successfully prepared. The coated C/C composites have a well-controlled interfacial microstructure and excellent oxidation resistance, resulting in reduced oxidation weight loss at high temperatures and increased ability to resist external damage.
A chromium carbide (Cr-C) coating in-situ formed on the C/C substrate is successfully prepared by a novel reactive wetting strategy. The interfacial microstructure and oxidation resistance of coated C/C composites are investigated in detail. The as-prepared coating mainly consists of Cr23C6 and Cr7C3, forming a tight joining with the C/C substrate. Compared to uncoated samples, the oxidation weight loss of coated C/C composites is sub-stantially reduced at high temperatures. Furthermore, the hardness of coated C/C composites is significantly increased, enhancing their ability to resist external damage. This reactive wetting strategy can also be used to prepare uniform coatings on C/C composites with complex grooved structure or large size. Surprisingly, coated C/C composites possess a low weight gain of 3.7% due to thin coating (< 10 mu m), which can maintain their advantage of low density.
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