Towards an aerogel-based coating for aerospace applications: reconstituting aerogel particles via spray drying

4th AEROTECH- Innovation in Aerospace Engineering and Technology

航空航天工程

Bheekhun, N.^1 ; Talib, A. R. Abu^1 ; Mustapha, S.^2 ; Ibrahim, R.^3 ; Hassan, M.R.^4

Propulsion and Thermo-Fluids Group, Department of Aerospace Engineering, Faculty of Engineering, Universiti Putra Malaysia, Malaysia^1

Department of Chemical and Environmental Engineering, Faculty of Engineering, Universiti Putra Malaysia, Malaysia^2

Advanced Materials Research Centre, Hi-Tech Park, Kedah, Kulim

09000, Malaysia^3

Department of Mechanical and Manufacturing Engineering, Faculty of Engineering, Universiti Putra Malaysia, Malaysia^4

关键词: Conventional materials;    Granulometric properties;    Independent variables;    Innovative solutions;    Median particle size;    Novel applications;    Optimised conditions;    Spray-dried powders;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/152/1/012066/pdf
DOI  :  10.1088/1757-899X/152/1/012066

学科分类：航空航天科学

来源: IOP

【 摘 要 】

Silica aerogel is an ultralight and highly porous nano-structured ceramic with its thermal conductivity being the lowest than any solids. Although aerogels possess fascinating physical properties, innovative solutions to tackle today's problems were limited due to their relative high manufacturing cost in comparison to conventional materials. Recently, some producers have brought forward quality aerogels at competitive costs, and thereby opening a panoply of applied research in this field. In this paper, the feasibility of spray-drying silica aerogel to tailor its granulometric property is studied for thermal spraying, a novel application of aerogels that is never tried before in the academic arena. Aerogel-based slurries with yttria stabilised zirconia as a secondary ceramic were prepared and spray-dried according to modified T aguchi experimental design in order to appreciate the effect of both the slurry formulation and drying conditions such as the solid content, the ratio of yttria stabilised zirconia:aerogel added, the amount of dispersant and binder, inlet temperature, atomisation pressure and feeding rate on the median particle size of the resulting spray-dried powder. The latter was found to be affected by all the aforementioned independent variables at different degree of significance and inclination. Based on the derived relationships, an optimised condition to achieve maximum median particle size was then predicted.