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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY · 2023 · IF 5.7

Effect of Si, Al2O3 additives on the ablation behavior of ZrB2-SiC coating with Al2O3-modified SiC bond coat for C/C composites

Gui Li,Jianjie Hao,Jiayan Li,Pengyu Dai,Bo Wang,Yuanqi Li,Yi Tan,Xueqiang Cao

This work firstly evaluated the effect of temperature on the preparation of SiC coating using Al 2 O 3 as catalyst by pack cementation (PC) method. SiC/ZrB 2 -SiC-Si (ZSS) and SiC/ZrB 2 -SiC-Al 2 O 3 (ZSA) coating were prepared on the surface of C/C composites by PC combined with atmospheric plasma spraying (APS). The objective of this work is to study the influence of Si and Al 2 O 3 additives for ablation performances of ZrB 2 -SiC coating. The coated samples were subjected to ablation test, and the phase composition and microstructure evolution were investigated. The results indicated that SiC/ZSA coating had better ablation resistance because phase transformation and growth of ZrO 2 grain was restrained by Al 2 O 3 .

CAS / MDL: 1344-28-1

研究领域: 材料科学 · 航空航天工程

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ADVANCED ENGINEERING MATERIALS · 2019 ·Vol. 21 ·期 9 ·1900458 · IF 2.906

The Surface Cracking Resistance of Al2O3-Modified SiCf/SiC-B4C Composites after Cyclic Oxidation in Wet Environment

Qingliang Shan,Qinglei Wang,Yudong Xue,Jianbao Hu,Jinshan Yang,Haijun Zhou,Guangxiang Zhu,Shaoming Dong

Aluminum oxide is introduced into SiC f /(SiC + B 4 C) composites to improve the surface cracking resistance after oxidizing at 1100 °C in O 2 /H 2 O (40/60) atmosphere. Research on morphology observation of oxidized composites reveals that Al 2 O 3 can lead to the formation of a dense and smooth oxidation layer, resulting in a relatively shallow oxygen penetration depth. In-depth studies on acoustic emission reveal that composites with Al 2 O 3 can improve the surface cracking resistance after oxidizing at 1100 °C in O 2 /H 2 O (40/60) atmosphere since the retention rates of σ min (first acoustic emission [AE] stress) and σ onset (AE onset stress) are significantly increased compared with virgin composites. Moreover, a small number of cumulative events and steep slope of strength–time curves at the initial stage further confirm the improvement of surface cracking resistance after oxidation.

CAS / MDL: 1344-28-1

研究领域: 材料科学 · 陶瓷材料

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Effect of Si, Al2O3 additives on the ablation behavior of ZrB2-SiC coating with Al2O3-modified SiC bond coat for C/C composites

The Surface Cracking Resistance of Al2O3-Modified SiCf/SiC-B4C Composites after Cyclic Oxidation in Wet Environment