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In-situ syhnthesis of SiC-ZrC-Al2O3-ZrO2 composite

Atasoy A

Archives of Materials Science and Engineering

2016

Vol. 78, nr 2

53--58

Purpose: The aim of the study was the processing of SiC based ceramic of SiC-Al2O3-ZrO2 composite with the various of starting composition silicon carbide (from 20% to 60 %), zircon (from 20% to 60%) and aluminum (from 0% to 10%) powders using solid and liquid sintering methods, and the physical properties and the characterization of the newly formed phases ant used experimental parameters. Design/methodology/approach: In order to analyses the reaction mechanism as well as the thermal behavior of the starting compositions, thermal analysis /TG/DTA and for the determination of nay phases, X-ray diffraction methods were used. To examine the morphology and particles morphology and the microstructures, scanning electron microspore (SEM) was used. Findings: The TG/DTA curves show endo/exothermic peaks related with the formation of carbides. The addition of Al was prevented the formation of yttrium aluminates phases. In presence of Al, the reduction and the liquid phase formation takes place. SiC acts as reducing agent. SiC-Al2O3-YSZ-ZrO2 phases were detected but at higher temperature the reaction phases were changed to ZrC, AlYZr, Y2O3 were detected as major phases in the processed samples. Practical implications: After the determination of the obtained phases, the resulting product is ceramic composite which consists of SiC-Al2O3-YSZ-ZrO2, ZrC, AlYZr, Y2O3 phases. It has potentially attractive composite where requires thermal stability in high temperature applications. Originality/value: The addition of aluminum to the mixture was facilitate the sintering process, was lowering the sintering temperature due to the high exothermic reaction which changes the reaction mechanism of the sintering from solid to liquid one.