Processing of Ultralight Porous Al2O3-Ceramics by Biotemplating of Bamboo

4th International Conference on Structure, Processing and Properties of Materials

Rahman, M.A.^1 ; Shorowordi, K.M.^1

Department of Materials and Metallurgical Engineering, Bangladesh University of Engineering and Technology, Dhaka

1000, Bangladesh^1

关键词: Al2O3 ceramics;    Alumina ceramic;    Bio-templating;    Hierarchical porous structures;    Interconnectivity;    Muffle furnaces;    Oriented growth;    Ultra-light;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/438/1/012015/pdf
DOI  :  10.1088/1757-899X/438/1/012015

来源: IOP

【 摘 要 】

Biomorphic alumina ceramic with a long, large and oriented growth of alpha alumina grains suitable for the devices such as prosthetic implants, dental implant and control drug release etc. Ultralight porous alumina was synthesized from a carbonaceous preform derived from bamboo using biotemplating technique. Carbonaceous preform (C-preform) of bamboo precursor was prepared by controlled thermal processing in a muffle furnace for pore formation. Al2O3 was inserted into C-preforms by sol-gel method applying repeated infiltration of low viscous Al2O3-sol and then dried and sintered at 1500°C in air atmosphere resulting of an ultra-light monophasic Al2O3 ceramics with replication of the pore structure of the bamboo C-preforms. The microstructure of porous Al2O3 was characterized by scanning electron microscopy (SEM). Open hierarchical porous structures surrounded by alumina struts web with nominal porosity of 80% inside the biomaterial are visualized which lacking of interconnectivity and low strength.