Dense amorphous Si2BC1-4N monoliths resistant to high-temperature oxidation for hypersonic vehicle. (February 2020)

• Record Type: Journal Article
• Authors: Li, Daxin; Yang, Zhihua; Jia, Dechang; Duan, Xiaoming; Cai, Delong; He, Peigang; Wang, Shengjin; Zhou, Yu
• Is Part Of: Corrosion science. Volume 163(2020)
• Publication Date: 2020-02
• Subjects: SiBCN -- Oxidation -- Crystallization -- Oxidation kinetics -- High-pressure sintering; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2019.108231
• Languages: English
• ISSNs: 0010-938X

Abstract

Graphical abstract: Highlights: The oxidation process for amorphous Si2BC1-4N monoliths was controlled by a classical parabolic or linear manner. Amorphous phase first undergoes oxidation attack followed by crystallization. The nucleation and growth of nanocrystals can be promoted by the thermo-oxidative coupling. The oxidation resistance of dense amorphous Si2BC1-4N monoliths is better than that of the nano monoliths. Abstract: Dense amorphous Si2 BC1-4 N monoliths were subjected to aggressive environments at high-temperatures to explore the oxide scale microstructure and growth kinetics. The effects of high-pressure sintering and crystallization on oxidation resistance were studied in detail. Dense amorphous Si2 BC1-4 N monoliths oxidize according to a parabolic rate law or linear equation, depend on the carbon content. Oxidation first attacks at the outermost surfaces of amorphous phases, subsequently proceeds at the interfaces of the crystallized nuclei and neighboring amorphous phases. High-temperature oxidation induces nucleation and thermo-oxidative coupling promotes the nucleation and growth of the nanocrystals.