Effects of preparing conditions on the synthesis of Y 2 SiO 5 nanoparticles by low-temperature molten salt method
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RESEARCH
Effects of preparing conditions on the synthesis of Y2SiO5 nanoparticles by low-temperature molten salt method Guangshu Li 1 & Chaohui Wang 1 & Liang Wang 2,3 & Yuhui Wang 1 & Hong Pan 1 & Wei Lin 1 & Qingke Li 1 & Chunqi Wang 1 & Jianing Wang 1 & You Wang 4 Received: 5 August 2019 / Revised: 3 July 2020 / Accepted: 13 August 2020 # Australian Ceramic Society 2020
Abstract Yttrium silicate is one of the promising environmental barrier coating materials used to protect ceramic matrix composites (CMCs) under specific operating conditions. In this paper, yttrium monosilicate (Y2SiO5, YMS) nanoparticles were synthesized using a molten salt method with a low synthesis temperature. To find the optimal experimental parameters, YMS nanoparticles were synthesized under different conditions using the molten salt method. The experimental parameters, such as different precursor/salt ratios, precipitants, calcination temperatures, and holding times, were studied. The samples were systematically characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), and BET method. The results showed that all the parameters we mentioned have effects on the synthesis of Y2SiO5 nanoparticles, especially the calcination temperature, the precipitant, and holding time. Keywords Nano materials . Yttrium silicate . Low-temperature molten salt method
Introduction Ceramic matrix composites (CMCs) are mainly composed of toughened continuous fibers and ceramic matrix. Ceramic matrix composites with good high-temperature stability, such as C/SiC or SiC/SiC, have become a promising high-temperature structural material. CMCs have replaced superalloys for components in the hot section of gas turbine engines due to their excellent mechanical properties and creep resistance at high temperature [1–5]. However, previous studies have shown that when the composite material is subjected to severe
* Chaohui Wang [email protected] 1
School of Materials Science and Engineering, Qiqihar University, Qiqihar 161006, People’s Republic of China
2
Integrated Computational Materials Research Centre, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 201899, People’s Republic of China
3
Key Laboratory of Inorganic Coating Materials CAS, Shanghai Institute of Ceramics, Chinese Academy of Science, Shanghai 201899, People’s Republic of China
4
Harbin Institute of Technology, Harbin 150001, People’s Republic of China
thermal cycling conditions, the thermal expansion mismatch between the fiber and the ceramic matrix leads to the appearance of microcracks and pores [6–8]. As a result, it was found that the composite is easily penetrated by oxygen, resulting in the carbon fibers being easily oxidized [9–13]. Therefore, it is necessary to develop a method to protect CMC. Environmental barrier coatings (EBCs) are a type of protective coatings used to provide an environmental shield for the CMC substrate. Rare earth silicate, especially yttrium monosilicate (Y2SiO5, YMS), is one of the most suitable EBC materials, due to i
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