Microstructure and Density of Sintered ZnO Ceramics Prepared by Magnetic Pulsed Compaction

Abstract

ree different sintered ZnO ceramics were prepared by magnetic pulsed compaction (MPC) and other conventional methods. e microstructures of the sintered ZnO ceramics prepared by MPC at sintering temperatures ranging from 900 to 1300°C showed a homogeneous grain growth compared to those of the samples prepared using other methods under the same sintering conditions. is implies that interpowders and/or intergrains can induce the minimization of wall friction effect because of the application of a high compaction pressure for a short process time in the MPC method. In addition, the microstructure of the sample obtained using the cold isostatic pressing method showed the presence of heterogeneous regions, indicating its low quality even though the densities of the three different samples were almost similar in the range of 97-99% at sintering temperatures of 900, 1100, and 1300°C. erefore, different methods used for the compaction of ZnO ceramics may result in different microstructural and physical properties of the product.

ZnO semiconductors obtained by slip casting: Application and reuse in photocatalysis

“…However, after its use, it is necessary to apply complex procedures to separate the semiconductors, which generates additional costs to the catalytic process and an increase in wastewater treatment time. 29 The preparation and use, in photocatalysis, of immobilized semiconductors, [30][31][32][33][34][35][36][37][38] that is, in the form of thin films [39][40][41][42] or ceramic pieces, is advantageous, since the removal of the catalyst from the reaction medium is facilitated, in addition to the possibility of its reuse in other reaction cycles, thus ensuring greater financial viability in an industrial aspect.…”

“…The obtaining of immobilized photocatalysts can be accomplished by several ceramic conformation techniques. 36,37 However, methods in which high porosity samples are obtained should always be prioritized, 42 in order to obtain a high surface area and greater efficiency in the process of contaminant degradation. In addition, immobilization makes it possible to obtain pieces with a certain mechanical resistance, which enables the reuse of the semiconductor in several degradation cycles.…”

“…The preparation and use, in photocatalysis, of immobilized semiconductors, 30–38 that is, in the form of thin films 39–42 or ceramic pieces, is advantageous, since the removal of the catalyst from the reaction medium is facilitated, in addition to the possibility of its reuse in other reaction cycles, thus ensuring greater financial viability in an industrial aspect.…”

“…The obtaining of immobilized photocatalysts can be accomplished by several ceramic conformation techniques 36,37 . However, methods in which high porosity samples are obtained should always be prioritized, 42 in order to obtain a high surface area and greater efficiency in the process of contaminant degradation.…”

Proposed Industrial Scale Setup for Production of ZnO Nanoparticles Using Wet Chemical Synthesis Method

“…In recent years, use of Zinc Oxide (ZnO) has been widely investigated for industrial applications in pharmaceutical and medicine manufacturing [1], rubber and polymer industries [2,3], ceramics and paint industries [4,5]. Conventionally, ZnO is produced on industrial scale by French or American processes and both are based on indirect or direct thermal methods where raw materials are in form of calcined ZnO ores or metallic or dross of zinc [6].…”