Sintering behaviour of a clay containing pyrophyllite, sericite and kaolinite as ceramic raw materials: Looking for the optimum firing conditions

IF 2.7 4区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS Boletin de la Sociedad Espanola de Ceramica y Vidrio Pub Date : 2023-01-01 DOI:10.1016/j.bsecv.2021.09.001
Pedro J. Sánchez-Soto , Eduardo Garzón , Luis Pérez-Villarejo , Dolores Eliche-Quesada
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引用次数: 2

Abstract

The sintering behaviour of a pyrophyllite clay has been investigated. The mineralogical composition by X-ray diffraction (XRD) of this sample was ∼35 wt.% pyrophyllite, ∼25 wt.% sericite/illite, ∼15 wt.% kaolinite and ∼20 wt.% quartz. The chemical composition was consistent with these results, with a total flux content of 4.18 wt.%. Prismatic bars were prepared by dry pressing using this sample and fired in the range 800–1500 °C with 0.5–5 h of soaking times. Sintering diagrams were obtained using the results of linear firing shrinkage, water absorption capacity, bulk density and apparent porosity determined in the ceramic bodies as a function of firing temperatures. It was found a trend of slight variations of bulk density values firing in the range 1000–1150 °C, with marked decreases of these values for these bodies fired at 1200 °C and 1300 °C. The temperature of maximum bulk density was determined as ∼1200 °C and the vitrification temperature was ∼1300 °C where the apparent porosity becomes almost zero. The vitrification process of the pyrophyllite clay sample was investigated using a method previously described in the literature, which considered an Arrhenius approach under isothermal conditions and a first order kinetic. It was determined an activation energy (Ea) of ∼45 kJ/mol with a linear correlation coefficient of 0.998. The relative rates of vitrification were calculated. It was found that the contribution of vitrification due to the heating was relatively small compared to the vitrification during soaking. Mullite and quartz are forming the ceramic bodies besides a vitreous or glassy phase. The thermally treated pyrophyllite clay showed a dense network of rod-shaped and elongated needle-like crystals, being characteristic features of mullite as a dense felt. The vitrification rate equation, as deduced in this study by first time, can be a useful tool to estimate the optimum firing conditions of the pyrophyllite clays applied as ceramic raw materials.

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以叶蜡石、绢云母和高岭石为陶瓷原料的粘土的烧结行为:寻找最佳烧结条件
研究了叶蜡石粘土的烧结行为。该样品的X射线衍射(XRD)矿物成分为~35wt%叶蜡石,~25 wt.%绢云母/伊利石,~15 wt.%高岭石和~20 wt.%石英化学成分与这些结果一致,总熔剂含量为4.18 wt.%。使用该样品通过干法压制制备棱镜棒,并在800–1500°C范围内烧制,浸泡时间为0.5–5小时。使用陶瓷体中测定的线性烧结收缩率、吸水能力、体积密度和表观孔隙率的结果作为烧结温度的函数来获得烧结图。研究发现,在1000–1150°C的温度范围内,堆密度值有轻微变化的趋势,在1200°C和1300°C的条件下,这些物体的堆密度值显著下降。最大堆积密度的温度确定为~1200°C,玻璃化温度为~1300°C,此时表观孔隙率几乎为零。使用文献中先前描述的方法研究了叶蜡石粘土样品的玻璃化过程,该方法考虑了等温条件下的阿伦尼斯方法和一阶动力学。测定的活化能(Ea)为~45 kJ/mol,线性相关系数为0.998。计算玻璃化的相对速率。研究发现,与浸泡过程中的玻璃化相比,由于加热引起的玻璃化的贡献相对较小。莫来石和石英除了形成玻璃或玻璃相外,还形成了陶瓷体。热处理的叶蜡石粘土显示出棒状和细长针状晶体的致密网络,这是莫来石作为致密毡的特征。本研究首次推导出的玻璃化速率方程,可用于估算叶蜡石粘土作为陶瓷原料的最佳烧制条件。
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来源期刊
Boletin de la Sociedad Espanola de Ceramica y Vidrio
Boletin de la Sociedad Espanola de Ceramica y Vidrio 工程技术-材料科学:硅酸盐
CiteScore
5.50
自引率
2.90%
发文量
72
审稿时长
103 days
期刊介绍: The Journal of the Spanish Ceramic and Glass Society publishes scientific articles and communications describing original research and reviews relating to ceramic materials and glasses. The main interests are on novel generic science and technology establishing the relationships between synthesis, processing microstructure and properties of materials. Papers may deal with ceramics and glasses included in any of the conventional categories: structural, functional, traditional, composites and cultural heritage. The main objective of the Journal of the Spanish Ceramic and Glass Society is to sustain a high standard research quality by means of appropriate reviewing procedures.
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