Improving the oxidation resistance of HfB2-SiC coatings on carbon/carbon composites by CeO2 doping

IF 5.7 3区材料科学 Q2 Materials Science

New Carbon Materials Pub Date : 2025-06-01 DOI:10.1016/S1872-5805(25)60994-2

Chang-lin HE , Zhi-chao SHANG , Wei-guang WANG , Xiang-ming LI , Kun WANG , Yue-xing CHEN , Xin-tan BAI , Pei-pei WANG , Xiang JI , Xuan-ru REN , A Levashov Evgeny , Kiryukhantsev-Korneev Ph V , Pei-zhong FENG

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Abstract

To improve the oxidation resistance of HfB₂-SiC coatings on carbon/carbon composites at 1700 °C in air, CeO₂ was introduced to improve oxygen blocking and its mechanism was investigated. During the rapid oxidation stage, CeO₂ accelerated the formation of a multiphase glass layer on the coating surface. The maximum oxidation rates of CeO₂-HfB₂-SiC coatings with 1%, 3%, and 5% CeO₂ were 24.1%, 20.3%, and 53.2% higher than that of the unmodified HfB₂-SiC coating, respectively. In the stable oxidation stage, the maximum oxidation rates of coatings with 1% and 3% CeO₂ decreased by 31.4% and 21.9%, respectively, demonstrating adequate inert protection. CeO₂ is a “coagulant” and “stabilizer” in the composite glass layer. However, increasing the CeO₂ content accelerates the reaction between the SiO₂ glass phase and SiC, leading to a higher SiO₂ consumption and reduced self-healing ability of the glass layer. The 1% CeO₂-60% HfB₂-39%SiC coating showed improved glass layer viscosity and stability, moderate SiO₂ consumption, and better self-healing ability, significantly boosting the oxidation protection of the coating.

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CeO2掺杂提高碳/碳复合材料表面HfB2-SiC涂层的抗氧化性

为了提高碳/碳复合材料表面HfB2-SiC涂层在1700℃空气中抗氧化性能，引入CeO2改善氧阻，并对其机理进行了研究。在快速氧化阶段，CeO2加速了涂层表面多相玻璃层的形成。添加1%、3%和5% CeO2的CeO2-HfB2-SiC涂层的最大氧化率分别比未改性的HfB2-SiC涂层高24.1%、20.3%和53.2%。在稳定氧化阶段，添加1%和3% CeO2的涂层的最大氧化速率分别下降了31.4%和21.9%，表现出良好的惰性保护。CeO2是复合玻璃层中的“混凝剂”和“稳定剂”。然而，CeO2含量的增加加速了SiO2玻璃相与SiC的反应，导致SiO2的消耗增加，玻璃层的自愈能力降低。1% CeO2-60% HfB2-39%SiC涂层提高了玻璃层粘度和稳定性，SiO2用量适中，自愈能力较好，显著增强了涂层的抗氧化能力。下载：下载高清图片（106KB）下载：下载全尺寸图片

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来源期刊

New Carbon Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-

CiteScore

6.10

自引率

8.80%

发文量

3245

审稿时长

5.5 months

期刊介绍： New Carbon Materials is a scholarly journal that publishes original research papers focusing on the physics, chemistry, and technology of organic substances that serve as precursors for creating carbonaceous solids with aromatic or tetrahedral bonding. The scope of materials covered by the journal extends from diamond and graphite to a variety of forms including chars, semicokes, mesophase substances, carbons, carbon fibers, carbynes, fullerenes, and carbon nanotubes. The journal's objective is to showcase the latest research findings and advancements in the areas of formation, structure, properties, behaviors, and technological applications of carbon materials. Additionally, the journal includes papers on the secondary production of new carbon and composite materials, such as carbon-carbon composites, derived from the aforementioned carbons. Research papers on organic substances will be considered for publication only if they have a direct relevance to the resulting carbon materials.