02134nas a2200265   4500008004100000022001400041245010400055210006900159260007300228300001200301490000800313520113300321653006501454653003301519653002501552100002201577700002201599700001801621700001201639700001701651700002401668700003201692700001701724856012701741       2015                        eng d  a0022-311500aStudy on fused/cast AZS refractories for deployment in vitrification of radioactive waste effluents0 aStudy on fusedcast AZS refractories for deployment in vitrificat  aPO BOX 211, 1000 AE AMSTERDAM, NETHERLANDSbELSEVIER SCIENCE BVcDEC  a144-1540 v4673 a<p>Fused/cast Al2O3-ZrO2-SiO2 (FC-AZS)' is being considered as `glass contact refractory' within ceramic melters, to be used for nuclear waste immobilization. Microstructural analyses reveal random distributions of baddeleyite (ZrO2) within aluminosilicate (Al2SiO5) matrix. Al-27 and Si-29 NMR data suggest that within aluminosilicate matrix Al occurs in both 4- and 6-fold co-ordinations whereas Si prefers a 4-fold environment. Polydispersity of pores has been studied with small-angle neutron scattering (SANS) technique. Corrosion rates of FC-AZS within 6 M HNO3, simulated wastes (500 h exposure), and borosilicate melt (975 degrees C, 800 h exposure) are found to be 0.38 x 10(3) mu my(-1), 0.13 x 10(3) mu my(-1) and 4.75 x 10(3) mu my(-1) respectively. A comparison of chemical interaction data clearly suggests that FC-AZS exhibits better chemical durability than AZC refractory (Al2O3-ZrO2-Cr2O3, also used for similar purpose). Thermal cycling studies indicate that FC-AZS retains structural integrity (including compressive strength and density) even up to 20 cycles. (C) 2015 Elsevier B.V. All rights reserved.</p>10aInteraction between refractory material and hazardous liquid10aNuclear waste immobilization10aVitrification melter1 aSengupta, Pranesh1 aMishra, Raman, K.1 aSoudamini, N.1 aSen, D.1 aMazumder, S.1 aKaushik, Chetan, P.1 aAjithkumar, Thalasseril, G.1 aBanerjee, K.  uhttps://library.ncl.res.in/content/study-fusedcast-azs-refractories-deployment-vitrification-radioactive-waste-effluents-0