title: Nano-alumina powders/ceramics derived from aluminum foil waste at low temperature for various industrial applications.
abstract: In this work, nanoscale single crystalline γ- and α-alumina powders have been successfully prepared from aluminum foil waste precursor via co-precipitation method using NH4OH as a precipitant. The obtained gel after co-precipitation treatment, was calcined at different temperatures (500,700, 900, 1050, 1100, 1300 and 1500 °C) and the products were characterized by XRD, FTIR and HRTEM. The results revealed that nano-γ-Al2O3 was fully transformed to nanometer-sized α-Al2O3 (36-200 nm) after annealing at temperatures as low as 1100 °C.The thermally preheated powder at 500 °C was further pressed under 95 MPa by the uniaxial press and the obtained bodies were found to have98.82% of the theoretical density, 1.18% porosity and 708 MPa compressive strength, when sintered at temperatures as low as 1600 °C without using any sintering aid. These excellent results proved that this work will contribute to finding a commercial source for preparing sub 100 nm α-alumina through the secondary resources management and even more so to synthesizing strong α-Al2O3 bodies which are promising in terms of their structure and compression. The α-Al2O3 bodies synthesized by the present work could be used as a feedstock for fabrication of various kinds of functional and structural materials that are extensively used in high tech.
authors: Refractory & Ceramic Materials Division (RCMD), Central Metallurgical R&D Institute (CMRDI), P.O. Box 87, Helwan, 11421 Cairo, Egypt.
authors: Ahmed A M
authors: AAM
authors: El-Amir
authors: Refractory & Ceramic Materials Division (RCMD), Central Metallurgical R&D Institute (CMRDI), P.O. Box 87, Helwan, 11421 Cairo, Egypt. Electronic address: dr_ewais@hotmail.com.
authors: Emad M M
authors: EMM
authors: Ewais
authors: Refractory & Ceramic Materials Division (RCMD), Central Metallurgical R&D Institute (CMRDI), P.O. Box 87, Helwan, 11421 Cairo, Egypt.
authors: Ahmed R
authors: AR
authors: Abdel-Aziem
authors: Chemistry Department, Faculty of Science, Helwan University, Helwan, Cairo, Egypt.
authors: Adel
authors: A
authors: Ahmed
authors: Chemistry Department, Faculty of Science, Cairo University, Giza, Egypt.
authors: Bahgat E H
authors: BEH
authors: El-Anadouli
mesh_terms: D000535:Aluminum; D000537:Aluminum Oxide / Q000737:chemistry*; D002516:Ceramics / Q000737:chemistry*; D003080:Cold Temperature; D006358:Hot Temperature; D046529:Microscopy, Electron, Transmission; D016062:Porosity; D011208:Powders; D012037:Refuse Disposal / Q000379:methods; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014866:Waste Products
chemical_list: D011208:Powders; D014866:Waste Products; D000535:Aluminum; D000537:Aluminum Oxide
keywords: Alumina based ceramics; Aluminium foil waste management; Co-precipitation synthesis; Compression; Microstructure; Nano alumina