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BULLETIN OF THE CHINESE CERAMIC SOCIETY ›› 2025, Vol. 44 ›› Issue (6): 2289-2296.DOI: 10.16552/j.cnki.issn1001-1625.2024.1479

• Ceramics • Previous Articles     Next Articles

Preparation and Properties of α-Al2O3/Cr2O3/SiO2 HydrogenBarrier Coating by Slurry Sintering

XIE Yipeng1, ZHOU Bo1, WANG Yuefeng1, WANG Feng1, FENG Zaiqiang2, TANG Mingqi2   

  1. 1. Henan Boiler and Pressure Vessel Inspection Technology Research Institute, Zhengzhou 450016, China;
    2. School of Material Science and Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China
  • Received:2024-12-02 Revised:2025-01-08 Published:2025-06-27

Abstract: An oxide composite hydrogen barrier coating was fabricated on 316L stainless steel via the sintering method, mainly composed of α-Al2O3/Cr2O3/SiO2. The influences of sintering temperature and slurry mass ratio on the macroscopic morphology of the coating were investigated. The microstructure analysis, hydrogen barrier performance, and thermal shock resistance of the coating were also examined. The findings reveal that when the sintering temperature is 725 ℃, and the slurry mass ratio is 1∶5, the surface of the coating is smooth, the number of pores and cracks is small, and the morphology is uniform, with an average thickness of approximately 64 μm. The composition phases of the coating are α-Al2O3, Cr2O3, and SiO2, in which α-Al2O3 and SiO2 are layered and unevenly distributed within the coating, while Cr2O3 is uniformly distributed in the coating. The obtained oxide composite hydrogen barrier coating exhibits excellent hydrogen barrier performance, with a reduction factor 15.3 compared to 316L stainless steel, and capable of withstanding 20 times thermal cycles at 450 ℃.

Key words: 316L stainless steel, alumina, chromium oxide, ceramic coating, sintering method, hydrogen barrier performance, thermal shock resistance

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