Effects of heating rates and SBE loading on sintered properties of spent bleach earth/recycled glass composite

Abstract

The purpose of this study is to investigate the influence of different heating rates on the properties of glass ceramic composite (GCC) at different spent bleach earth (SBE) loadings. GCC was prepared using SBE and recycled soda lime silicate (SLS) glass. The particle size of SLS glass was approximately <45µm. The GCC was formed by uniaxial dry pressing at weight fractions of SBE loading of 40 wt. %, 45 wt. %, and 55 wt. %. The GCC was then sintered at different heating rates of 2 ºC/min, 4 ˚C/min, 6 ºC/min and 8 ˚C/min at 700 ºC of sintering temperature. The GCC specimens were analysed in terms of their physical properties, while crystalline phase and microstructure were characterised using X-Ray diffraction and scanning electron microscope (SEM), respectively. The results from X-Ray diffraction pattern showed that quartz and wollastonite phases were formed with no major changes on the phases as the heating rate increased. The results indicate that the variation of heating with 2 ºC/min interval does not give a remarkable result of physical properties on GCC. High loading of SBE sintered at 2 ºC/min of heating rate produced low water absorption, density and porosity. SEM analysis showed that the physical properties and crystalline phases were correlated to the SBE loading and changes in the heating rate. The study concluded with the prospect of continuing the work of optimisation on schedule heat treatment at sintering temperature regimes.

High color‐purity broad orange‐red emission of Mn2+‐doped transparent phosphate glass–ceramics embedded NaYP2O7 crystals

“…This phenomenon might be attributed to the entrapment of gasses by the rearrangement of molecules in the glass structure. A similar exothermic effect has been reported in the soda lime silicate glass and high‐cordierite glass 21,22 . In general, the smaller the difference Δ T between T c and T g , the easier the crystallization process of the glass materials 23 .…”

“…A similar exothermic effect has been reported in the soda lime silicate glass and high-cordierite glass. 21,22 In general, the smaller the difference ΔT between T c and T g , the easier the crystallization process of the glass materials. 23 The ΔT value of the as-prepared phosphate glass is 150 • C and 200 • C for powder and…”

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