期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 42, 期 3, 页码 830-840出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2021.11.008
关键词
Alternate ZrC-SiC coating; Carbon/carbon composites; Plasma spraying; Ablation resistance
资金
- National Natural Science Foundation of China [91860203, 51727804]
- Natural Science Basic Research Plan in Shaanxi Province of China [2020JQ-175]
- Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University [CX2021006]
- Creative Research Foundation of Science and Technology on Thermostructural Composite Materials Laboratory
The investigation focused on the ablation behavior and thermal stress of monolayered ZrC-SiC coatings with different SiC amounts. An alternate coating with 4 sublayers containing 10 and 70 vol.% SiC was applied on SiC-coated C/C composites. Ablation tests under oxyacetylene torch showed that the alternate coating provided superior ablation properties by enduring mechanical denudation and hindering oxygen transport inward during ablation.
Based on the investigation of ablation behavior and thermal stress of the monolayered ZrC-SiC coatings with different SiC amounts, an alternate coating consisting of 4 sublayers with 10 and 70 vol.% SiC was prepared on SiC-coated carbon/carbon (C/C) composites through plasma spraying technique. Ablation tests were carried out under oxyacetylene torch with a heat flux of 2.38 MW/m(2). The alternate coating could offer 90 s ablation shield for C/C composites, providing superior ablation properties than all monolayered coatings. The improved ablation resistance is mostly induced by the fact that the outmost scale with abundant ZrO2 particles was able to better endure the mechanical denudation from the torch. Moreover, due to the indirect contact with torch, the innermost sublayers were placed into relatively mild environment, thereby most of Si-based oxides could be retained and further hinder oxygen transport inward during ablation.
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