Preparation, pore structure and properties of uniformly porous glass-ceramics sintered from granite powder using SiC@SiO2 foaming agent

IF 5.1 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
Jian Zhou, Jinshan Lu, Changyou Liu, Liang Chen
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Abstract

Granite sludge produced during the processing of granite blocks should be efficiently recycled for environmental protection and as a sustainable resource. In this work, porous glass-ceramics were prepared by stepwise sintering of granite powder using core-shell SiC@SiO2 foaming agent. The SiC and SiC@SiO2 foaming agents were compared in terms of the sintering and foaming behaviors of the powder compacts by thermal expansion, thermogravimetry and mass spectroscopy. The foaming agent and foaming temperature were investigated to study their effects on the pore structure and properties of the porous glass-ceramics. The SiO2 shells of the SiC@SiO2 particles inhibited the oxidation of the SiC cores and the release of CO2 at the early stage of the sintering process, thus preventing pore coalescence and increasing the densification and specific strength of the sintered glass-ceramics. As the foaming temperature increased, the porous glass-ceramics exhibited a linear relationship between pore size and foaming temperature, and the specific strength first increased and then decreased due to pore coalescence and reduced crystallinity. Furthermore, the linear relationship between thermal conductivity and porosity indicates a closed pore structure, as demonstrated by computed tomography. At a foaming temperature of 1220 °C, the porous glass-ceramic has a porosity of 50.1 %, a specific strength of 16.6 kN⋅m/kg and a thermal conductivity of 0.747 W/(m⋅K). Numerical simulation confirms that lightweight glazed glass-ceramics have potential applications in energy-efficient building tiles.
使用 SiC@SiO2 发泡剂烧结花岗岩粉末的均匀多孔玻璃陶瓷的制备、孔结构和性能
花岗岩砌块加工过程中产生的花岗岩污泥应得到有效回收,以保护环境并作为一种可持续资源。本研究采用核壳 SiC@SiO2 发泡剂对花岗岩粉末进行分步烧结,制备了多孔玻璃陶瓷。通过热膨胀仪、热重仪和质谱仪比较了 SiC 和 SiC@SiO2 发泡剂在粉末压实物烧结和发泡方面的性能。研究了发泡剂和发泡温度对多孔玻璃陶瓷孔结构和性能的影响。SiC@SiO2 颗粒的 SiO2 外壳在烧结过程的早期阶段抑制了 SiC 内核的氧化和 CO2 的释放,从而防止了孔隙凝聚,提高了烧结玻璃陶瓷的致密性和比强度。随着发泡温度的升高,多孔玻璃陶瓷的孔径与发泡温度呈线性关系,由于孔凝聚和结晶度降低,比强度先升高后降低。此外,热导率与孔隙率之间的线性关系表明孔隙结构是封闭的,这一点已通过计算机断层扫描技术得到证实。发泡温度为 1220 ℃ 时,多孔玻璃陶瓷的孔隙率为 50.1%,比强度为 16.6 kN-m/kg,导热系数为 0.747 W/(m-K)。数值模拟证实了轻质釉面玻璃陶瓷在节能建筑瓷砖中的潜在应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Ceramics International
Ceramics International 工程技术-材料科学:硅酸盐
CiteScore
9.40
自引率
15.40%
发文量
4558
审稿时长
25 days
期刊介绍: Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.
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