材料科学
莫来石
复合数
复合材料
热喷涂
纳米压痕
微观结构
扫描电子显微镜
涂层
陶瓷
气动冷喷涂
喷雾干燥
化学工程
工程类
作者
Alireza Hasani,Majid Mohammadi,M. Hajian,A. Abedi Nieai
出处
期刊:International Journal of Materials Research
[De Gruyter]
日期:2022-06-28
标识
DOI:10.1515/ijmr-2020-8195
摘要
Abstract Environmental barrier coatings (EBCs) have been widely used as protective layers to protect the surface of ceramic components from water vapor degradation and hot corrosion at operating temperature. In this study, ytterbium monosilicate (Yb 2 SiO 5 ) and mullite (3Al 2 O 3 ·2SiO 2 ) powders were synthesized by mechanical alloying to be considered as a new environmental barrier coating. The composite powder was granulated by the spray dryer process and deposited on SiC reinforced by carbon fibers (SiC/C f ) substrate using the atmospheric plasma spray method. Phases in the synthesized composite powders and the deposited EBC were identified using X-ray diffraction. A field emission scanning electron microscope equipped with energy dispersive X-ray spectroscopy was utilized to study the powder morphology and coating microstructure. After the spray dry processing, the powders exhibited a spherical morphology and good-flowability with a mean particle size of 20–40 µm. The coating thickness was measured to be between 100 and 150 μm. In addition, the results of nanoindentation testing exhibited a hardness of about 8 GPa and an elastic modulus of about 111 GPa for the deposited coatings.
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