SOL-GEL synthesis of mullite coatings Rishabh Chaturvedi ⇑ , Anas Islam Department of Mechanical Engineering, GLA University, Mathura, UP, India article info Article history: Received 14 August 2020 Accepted 3 September 2020 Available online xxxx Keywords: Coatings of the barriers of environment The technique sol gate Mullite Silicon carbide abstract Metals and their alloys, though having a broad spectrum of applications, cannot fulfill the requirements for the high temperature applications which are being and have been conceived these days. The higher operating temperatures pave the way for further technological advances. In order to sustain tempera- tures of the order of 1200 °C and higher, ceramic materials come to the fore. While popular ceramics like alumina, silicon carbide, silicon nitride have shown extremely good stability and durability under dry oxidizing conditions, when used in environments found in gas turbine applications, these materials have some limitations. To protect the component from this corrosion, the SiO, has to be protected. With this purpose in mind, Environmental Barrier Coatings have been introduced. These EBCs are primarily corro- sion resistant coatings for high temperature applications. For this project, efforts are put together to cre- ate a mullite upon SIC EBC substrate utilizing sol–gel creation. For the synthesized mullite characterization has been conducted. It was done through X-ray diffraction (XRD) as well as Scanning Electron Microscopy (SEM). Results of differences in deciding parameters have also been elaborated in detail. Ó 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Confer- ence on Newer Trends and Innovation in Mechanical Engineering: Materials Science. 1. Introduction 1.1. Need for EBCs The most prominent candidates are Silicon-based ceramics meant for high temperature structural factors in gas turbine engi- nes for the coming generation. Any further developments in gas turbine engine technology needs an upcoming generation of mate- rials possessing a temperature capacity significantly more than contemporary metallic high temperature structure based materi- als. As far as metallic materials are concerned, the Ni-based high temperature alloys such as Cronix, Nicrofer have reached the limit of their capacities and cannot be safely used beyond 1100 °C. But in case of gas turbines and thrusters of rockets, operating tempera- tures of over 1300 °C are frequently reached. Silicon based ceram- ics such as Sic, Si 3 N 4 , and their composites show much better stability at such high temperatures and thus widen the scope of growth of greater performance intense temperature applications. The stability of silica based ceramics at high temperatures is aided by the formation of a protective silica (SiO 2 ) scale on the surface that stops next oxidation. Yet in the year 1950’s, it struck as a fact that the silica scale gradually erodes in contact of intense speed water vapor in the active ambience. In such situation, while organic fuel (hydrocarbons) is combusted. Deterioration of layer of silica upon SiC follows like SiC þ 2O 2 ; SiO 2 þ CO 2 SiO 2 þ 2H 2 O ! Si OH ð Þ 4 Si (OH) 4 is movable as well as loses itself, putting forward refreshed silicon for oxidation. It results in temporary stoppage the silicon based ceramic [2-4]. Moreover, the existence of ele- ments like Na, S as well as V combustion ambience results in the creation of oxides of corrosion like Na 2 O 3 ,V 2 O 5 , SO 3 [1] as well as SO 2 that react along with obvious saving silica measurements for creating silicates of low melting temperature, resulting in the intense pit creation, material deficit and heightened porosity [5,6]. This stoppage of SiC can be slowed down through saving sil- ica measurement from being volatilized because of fast speed steam as well as from interacting with corrosion of oxides. This objective is sought to be attained by applying an Environmental Barrier Coating onto the silicon based ceramic. https://doi.org/10.1016/j.matpr.2020.09.026 2214-7853/Ó 2020 Elsevier Ltd. All rights reserved. Selection and peer-review under responsibility of the scientific committee of the International Conference on Newer Trends and Innovation in Mechanical Engineering: Materials Science. ⇑ Corresponding author. E-mail addresses: rishabhroxx1995@gmail.com (R. Chaturvedi), anas.islam@gla. ac.in (A. Islam). Materials Today: Proceedings xxx (xxxx) xxx Contents lists available at ScienceDirect Materials Today: Proceedings journal homepage: www.elsevier.com/locate/matpr Please cite this article as: R. Chaturvedi and A. Islam, SOL-GEL synthesis of mullite coatings, Materials Today: Proceedings, https://doi.org/10.1016/j. matpr.2020.09.026