Low temperature in-situ reaction sintering of zircon: Alumina composites trough spark plasma sintering

Science of Sintering

关键词: zircon;    spark plasma sintering;    mullite;    X-ray diffraction;    SEM;   

DOI  :  10.2298/SOS1203323A

来源: DOAJ

【 摘 要 】

Pure Zircon and Zircon: Alumina (ZrSiO4: α-Al2O3) composite powders weresubjected to densification studies employing spark plasma sintering (SPS).Physico chemical and microstructural properties of the samples were evaluatedand compared with that of conventionally sintered (CRH-Constant Ramp andHold) compacts. Density measurements and microstructural evaluation revealeda low temperature densification of Zircon: Alumina at temperatures as low as1300°C by SPS. Increase of temperature to 1350°C had shown negligible changesin density and on further heating the sample melts at 1400°C as a result ofexcessive formation of liquid phase. However, pure zircon could not bedensified in the absence of alumina under SPS conditions. It is evident thataddition of alumina enhances partial low temperature decomposition of zirconunder the influence of plasma generated during SPS. Mullite formed as aresult of this insitu reaction between alumina and silica acts as a bondingphase as revealed by the X-ray diffraction (XRD), Scanning electronmicroscopy (SEM) and Electron disperse scanning (EDS) analysis.

【 授权许可】

Unknown