Effect of fly ash on the physico-chemical and mechanical properties of a porcelain composition
Effect of fly ash on the physico-chemical and mechanical properties of a porcelain composition
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DOI：
10.1016/j.ceramint.2009.12.012
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发表时间：
2010-04
影响因子：
5.2
通讯作者：
T. Mukhopadhyay;Saswati Ghosh;J. Ghosh;S. Ghatak;H. S. Maiti
中科院分区：
文献类型：
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作者：
T. Mukhopadhyay;Saswati Ghosh;J. Ghosh;S. Ghatak;H. S. Maiti
陶瓷行业是天然原材料的最大消费者之一，但也有能力和潜力通过消费各种行业的固体废弃物为解决环境问题做出重大贡献。在传统的三轴瓷组合物中，石英被粉煤灰完全取代。通过测量相关性能，研究了这种替代以及随后在不同温度（1100-1300°C）下烧制试样的效果。具有30%粉煤灰的试样获得最佳性能。发现长石的需求量降低到20%。瓷坯的抗折强度在1300°C时达到最大值72.3MPa，显气孔率几乎为零。与常规三轴体相比，弯曲强度增加了约20%。长石含量超过20%时，玻璃化范围变窄。莫来石含量随粉煤灰掺量的增加而增加。SEM研究表明，α-石英和二次莫来石针嵌入在玻璃基质中的存在。还观察到石英颗粒周围的广泛裂纹。细莫来石针的强烈联锁被认为是负责发展较高的抗折强度在粉煤灰纳入瓷体。已经提出了一种组合物，其中可以容纳高达30%的飞灰。因此，提出了一种其他废物材料的替代用途，这可以转化为经济效益，同时为环境和废物处理方面的问题提供了一种可能的解决方案。
The ceramic industry is one of the largest consumers of natural raw materials but has also the capacity and potential to make significant contributions in solving environmental problems by consuming solid rejects of various industries. In a traditional triaxial porcelain composition quartz was fully substituted by fly ash. The effect of this substitution and subsequently firing the specimens at different temperatures (1100–1300°C) were investigated by measuring related properties. Optimum properties were obtained with the specimen having 30% fly ash. Requirement of feldspar was found to be reduced to 20%. The flexural strength of the porcelain body reached a maximum value of 72.3MPa at 1300°C while the apparent porosity value reached almost zero. There was around 20% increase in flexural strength in comparison to that of the conventional triaxial body. Higher proportion of feldspar above 20% resulted in narrowing the vitrification range. Mullite content was found to increase with increasing proportion of fly ash. SEM studies revealed the presence of α-quartz and secondary mullite needles embedded in a glassy matrix. Extensive cracking around the quartz grains was also observed. Intense interlocking of fine mullite needles was found to be responsible for development of higher flexural strength in fly ash incorporated porcelain body. A composition has been proposed where fly ash as high as 30% can be accommodated. Thus, an alternative use of an otherwise waste material is proposed, which can be converted into economic benefit and at the same time offering a possible solution to problems so far as environmental and waste disposal are concerned.