Utilization of waste glass with natural pozzolan in the production of self-glazed glass-ceramic materials

IF 6.1 3区 材料科学 Q1 CHEMISTRY, MULTIDISCIPLINARY
S. Eldera, S. Aldawsari, E. Hamzawy
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引用次数: 0

Abstract

Abstract Significant self-glazed glass-ceramic was obtained from a natural pozzolan and external glass cullet. Natural pozzolan with/without glass cullet was fused to glass melt that quenched in water to glass frits. The dried glass frits were pulverized (<0.083 mm) and then shaped in a stainless mold. The thermal behavior of the glasses shows a widening of the crystallization temperature with the incorporation of the glass cullet between ∼800 and 950°C. Sintering of the shaped glass powder at 1,050°C/2 h lead to the crystallization of augite, enstatite, cristobalite, and hematite. The microcrystalline structure shows massive texture with pores in-between; however, at high magnification regular euhedral to subhedral crystals in submicron to nearly submicron size was developed in the glassy matrix and their microanalysis indicates the dominant augite. The density of the glass-ceramic samples decreases from 2,706 to 2,539 kg/m3 with the incorporation of glass wastes. The sample surfaces show, through force electron microscopy, the fineness and smoothness of the grains with the incorporation of the glassy portion. The microhardness values were between 6.43 and 6.11 GPa. The coefficient of thermal expansion increased from 32.87 (25–300°C) to 66.89 (25–500°C) × 10−7°C−1. The chemical resistance of samples in water (0.0002–0.0016) is better than in an acidic medium (0.0011–0.0017). These glass-ceramic enjoy good density, hardness, and thermal expansion and can be used in the ceramic industry and cladding walls and floors.
利用废弃玻璃与天然火山灰生产自玻璃陶瓷材料
摘要利用天然火山灰和外部玻璃碎粒制备了具有重要意义的自上釉玻璃陶瓷。将天然火山灰(含/不含玻璃屑)熔合成玻璃熔体,在水中淬火成玻璃熔块。将干燥后的玻璃块粉碎(<0.083 mm),然后在不锈钢模具中成型。玻璃的热行为表明,随着玻璃屑的加入,结晶温度在~ 800 ~ 950℃之间变宽。在1050℃/2 h下烧结成形玻璃粉,形成辉长石、长辉辉石、方石云石和赤铁矿的结晶。微晶结构呈块状织构,中间有孔隙;然而,在高倍镜下,在玻璃状基体中发育了亚微米至近亚微米大小的规则自面体至亚面体晶体,显微分析表明其主要为奥辉石。随着玻璃废料的掺入,玻璃陶瓷样品的密度从2,706 kg/m3下降到2,539 kg/m3。样品表面通过力电子显微镜显示出颗粒的细度和光滑性,其中含有玻璃质部分。显微硬度值在6.43 ~ 6.11 GPa之间。热膨胀系数由32.87(25-300°C)增加到66.89(25-500°C) × 10−7°C−1。样品在水中的耐化学性(0.0002-0.0016)优于在酸性介质中的耐化学性(0.0011-0.0017)。这些玻璃陶瓷具有良好的密度、硬度和热膨胀性,可用于陶瓷工业和包覆墙壁和地板。
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来源期刊
Nanotechnology Reviews
Nanotechnology Reviews CHEMISTRY, MULTIDISCIPLINARY-NANOSCIENCE & NANOTECHNOLOGY
CiteScore
11.40
自引率
13.50%
发文量
137
审稿时长
7 weeks
期刊介绍: The bimonthly journal Nanotechnology Reviews provides a platform for scientists and engineers of all involved disciplines to exchange important recent research on fundamental as well as applied aspects. While expert reviews provide a state of the art assessment on a specific topic, research highlight contributions present most recent and novel findings. In addition to technical contributions, Nanotechnology Reviews publishes articles on implications of nanotechnology for society, environment, education, intellectual property, industry, and politics.
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