The effect of parametric variation on the mullite content of plasma sprayed zircon-alumina powder mixture

Hazra, S.; Bandyopadhyay, P.P.

doi:10.1016/j.surfcoat.2016.06.025

Cited by 10 publications

(1 citation statement)

References 27 publications

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“…Mullite is a refractory oxide ceramic with the compositions of 3Al 2 O 3 ⋅2SiO 2 (simply called 3/2-mullite or stoichiometric mullite), and some basic physical properties are listed in Table 1. 38,59,[86][87][88][89][90] Mullite has attracted significant attention from researchers because of its excellent properties that meet the requirements of EBC coating. For instance, the chemical compatibility and CTE of mullite match with the SiC-based substrate.…”

Section: Mullite Bond Coatmentioning

confidence: 99%

Research status of bond coats in environmental barrier coatings

Zhang

Park

Zhang

et al. 2022

Int J Applied Ceramic Tech

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Bond coats in environmental barrier coatings (EBCs) prevent oxidants from penetrating the substrate, mediate the mismatch of the coefficient of thermal expansion (CTE), and improve the adhesion strength between adjacent layers. However, the development of bond coats is rarely studied systematically. In this paper, the research status of the bond coats in EBCs is introduced in detail, including the materials and deposition methods. Thus far, Si, modified‐Si, mullite, etc., have been employed as bond coats. Nevertheless, visible drawbacks of each bond coat limit their application at high‐temperatures in extreme environments. Si bond coat is easily oxidized and forms thermally grown oxides that form cracks, resulting in delamination, spallation, and failure of EBCs. In the Si–HfO2 bond coat, the optimal ratios of Si/HfO2, deposition methods, distribution of Si and HfO2, and oxidation of Si remain completely unsolved. For mullite bond coat, SiO2 suffers selective evaporation in the water vapor environment, and the ratios of the Al2O3 and SiO2 in mullite coatings restrict its service lifetime. HfSiO4 is a potential candidate acting as a next‐generation bond coat in EBCs is proposed. Furthermore, choosing reasonable deposition methods is beneficial to improve the performances of the bond coats in EBCs.

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