Abstract
Conventional and Non-conventional Sintering Techniques of High Purity Alumina Ceramics
Highlights
Aluminium oxide or alumina (Al2O3) is an oxide technical ceramic material with α-Al2O3, the most stable form thermodynamically
Higher linear shrinkage and densification were obtained for alumina samples sintered in electrical kiln, while sintering by faster and more energy efficient hybrid microwave kiln yielded alumina samples with finer grain size
According to the results of chemical composition analysis, raw Al2O3 powder has a high purity of 99.83 wt. %
Summary
Aluminium oxide or alumina (Al2O3) is an oxide technical ceramic material with α-Al2O3, the most stable form thermodynamically. Alumina exists in several metastable polymorphs such as γ, δ, η, θ, κ, χ [1, 2]. Alumina shows properties such as high elastic modulus, high wear resistance, high chemical corrosion resistance, high temperature stability, retention of strength at high temperatures and brittleness and low fracture toughness [3, 4]. Alumina is the first choice as refractory material because of the low cost, simple handling and production [5]. Biocompatibility makes alumina as high potential material in medicine application (dental, cardiologic, orthopaedic, bionic) [6, 7]. High purity alumina (> 99.5 wt. %) may be used as structural element and electric insulator in nuclear reactors, for corrosion and wear protection, in automobile and spacecraft industry, in environmental industries, in water vapour processing, as well as in oil and gas energy production [7, 8]
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