Gravimetric and spectroscopic studies of the chemical combination of moisture by as-fired and reheated terracotta

Gravimetric and spectroscopic studies of the chemical combination of moisture by as-fired and reheated terracotta
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烧制和再加热陶土水分化学组合的重量分析和光谱研究

DOI:
10.1016/j.jeurceramsoc.2010.02.029
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发表时间:
2010
影响因子:
5.7
通讯作者:
Tosheva L
Tosheva L
中科院分区:
材料科学1区
文献类型:
--
作者:
Tosheva L

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本文介绍了微天平测量在研究粘土陶瓷中水分的化学复合中的应用。研究了在800°C至1200°C温度范围内烧制的陶土在恒温和相对湿度(RH)条件下的质量增加动力学。实验结果表明,质量的增加分两个阶段进行。根据(时间)1/4定律,将第二级质量增益作为与水分长期化学结合能力的度量。在1000°C下烧制的陶土获得了最大的质量增益率。结果表明,在500°C和原始烧制温度之间的任何温度下重新加热烧制过的陶土样品都会使材料恢复到烧制时的状态。这得到了拉曼光谱的支持。在再加热过程中,超过原来的烧成温度会改变随后对水分的反应速度,这为确定陶瓷制品的原始烧成温度提供了一种方法。
The application of microbalance measurements to investigate the chemical recombination of moisture with fired clay ceramics is demonstrated. The kinetics of mass gain at constant temperature and relative humidity (RH) are studied for terracotta fired at temperatures between 800°C and 1200°C. The experimental results show that mass gain proceeds in two stages. The second stage mass gain is taken as a measure of the capacity for long-term chemical combination with moisture based on the (time)1/4law. A maximum rate of mass gain is obtained for terracotta fired at 1000°C. It is shown that reheating a sample of fired terracotta at any temperature between 500°C and the original firing temperature will return the material to its as-fired state. This is supported by Raman spectroscopy. Exceeding the original firing temperature during reheating alters the subsequent rate of reaction to moisture, suggesting a method for determining the original firing temperature of ceramic artefacts.
DOI: 10.1038/257122a0
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