煅烧温度对环保型莫来石多孔陶瓷结构和性能的影响

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中文摘要：莫来石多孔陶瓷因其高强度和耐腐蚀等性能得到广泛地应用.然而,由于合成莫来石的原料高岭土的不可再生性及持续上涨的价格,寻找廉价易得的替代原料对于合成莫来石多孔陶瓷迫在眉睫.建筑废弃物的成分与高岭土相似,可作为高岭土的可行替代品之一.以建筑废弃物和Al2O3为主要原料,AlF3为晶须催化剂,B2O3为烧结助剂,成功制备了环保型莫来石多孔陶瓷.通过阿基米德排水法、XRD和SEM等表征手段,深入探究了多孔陶瓷的晶相、微观形貌和物理化学特性.同时,研究了煅烧温度对莫来石多孔陶瓷结构和性能的影响规律及作用机制.结果表明,适当提升煅烧温度有助于莫来石晶须的生成,但过高的温度会导致晶须粗化和晶粒增大.当煅烧温度为1 200℃时,莫来石晶须的生长形貌最佳,晶须直径约为0.05-0.1 μm、长度为0.5-1 μm、长径比在15-20之间.随着煅烧温度增加,莫来石多孔陶瓷的开口孔隙率不断降低,抗折强度不断增强.当煅烧温度为 1 200℃时,样品的开口孔隙率达到(61.78±0.72)%,抗折强度达到(3.74±0.46)MPa.因此,以建筑废弃物为主要原料可成功制备具有高气孔率的莫来石多孔陶瓷.本研究为建筑废弃物合成莫来石多孔陶瓷提供了可靠的理论支持,对降低生产成本及推动建筑废弃物资源化再利用等有重要理论价值和实际意义.

外文标题：Effect of Sintering Temperature on Structure and Properties of Environmentally Friendly Mullite Porous Ceramics

外文摘要：Mullite porous ceramics are widely used owing to their high strength and corrosion resistance.However,the escalating price and non-renewable nature of kaolin,the primary raw material for mullite synthesis,underscore the urgency of identifying cost-effective and readily available alternatives.The composition of construction waste is similar to kaolin,so it can be used as a viable alternative to kaolin.his study explores the utilization of construction waste and Al2O3 as the main raw materials,with AlF3 serving as a whisker catalyst,and B2O3 as a sintering agent,in the fabrication of eco-friendly mullite porous ceramics.The crystalline phase composition,micro-morphology and physicochemical properties of porous ceramics were investigated by means of Archimedean drainage method,XRD and SEM.The effect of sintering temperature on its structure and properties and its mechanism were studied.Findings reveal that an optimal increase in sintering temperature facilitates mullite whisker formation,with whisker length exhibiting an initial growth followed by a decline as temperature escalates.When the sintering temperature was 1 200℃,the mullite whisker attains its optimum growth morphology,featuring a diameter of approximately 0.05-0.1 μm,length ranging between 0.5-1 μm,and a length-to-diameter ratio falling within 15-20.Excessive sintering temperatures result in coarsening of mullite whiskers and enlargement of grain size.With the increase of sintering temperature,the open porosity of mullite porous ceramics decreased and the bending strength increased.Specifically,at 1 200℃,the sample achieved an open porosity of 61.78±0.72%and a bending strength of 3.74±0.46 MPa.Then,the mullite porous ceramics with high porosity can be successfully prepared by using construction waste as the main raw material.This study provided reliable theoretical underpinnings for the synthesizing mullite porous ceramics from construction waste,with profound implications for reducing the production costs and advancing construction waste recycling initiatives.

外文关键词：

porous ceramicsconstruction wastemullite whiskerin situ synthesissintering temperatureresource utilizationformation mechanismmicrostructure

作者：

伍芷菁、花开慧、钟雅丽、陈晓冰、高品海、郑愚

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作者单位：

东莞理工学院生态环境与建筑工程学院,广东东莞 523808

广东省城市生命线工程智慧防灾与应急技术重点实验室,广东东莞 523808

关键词：

多孔陶瓷建筑废弃物莫来石晶须原位合成煅烧温度资源化利用形成机制微观结构

基金：

广东省基础与应用基础研究基金区域联合基金项目(地区培育项目)东莞市社会发展科技项目(重点项目)粤澳科技创新联合资助广东省基础与应用基础研究基金广东省联合培养研究生示范基地人才培养项目松山湖科特派员项目东莞理工学院质量工程项目广东省城市生命线工程智慧防灾与应急技术重点实验室广东省基础与应用基础研究基金项目

项目编号：

2023A1515140095202118009053022022A050502003019201910260000040粤教研函[2021]2号粤教研函[2023]3号20234418-01KCJ-G2023020312022B12120100162020A1515110081

出版年：

2024

DOI：

10.20038/j.cnki.mra.2024.000010

材料研究与应用

广州有色金属研究院

材料研究与应用

影响因子：0.349

ISSN：1673-9981

年,卷(期)：2024.18(3)

参考文献量21