Evaluation of the degree of crystallisation in glass-ceramics by density measurements
Evaluation of the degree of crystallisation in glass-ceramics by density measurements
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DOI：
10.1016/s0955-2219(98)00226-x
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发表时间：
1999-05
影响因子：
5.7
通讯作者：
A. Karamanov;M. Pelino
中科院分区：
文献类型：
--
作者：
A. Karamanov;M. Pelino
开发了一种理论方法，目的是通过测量母玻璃的密度和热处理后的微晶玻璃的密度，准确而快速地估计黄钾铁矾土玻璃的晶化程度。将黄钾铁矾土废料与花岗岩废料和玻璃碎块混合，制成三种不同的玻璃批次，在1450℃熔化，淬火和热处理，得到不同晶化程度的微晶玻璃。密度测量是用氦置换比重瓶进行的。将所得结果与X射线衍射仪测定的结晶度进行了比较，两者吻合较好。如果与相变相关的密度变化足够大，则该方法是适用的。在辉石和磁铁矿的形成中，与母体玻璃相比，密度变化较大，精度高，易于应用。
A theoretical procedure has been developed with the aim of obtaining an accurate and rapid estimation of the degree of crystallisation in jarosite glasses by measuring the densities of the parent glass and, after the thermal treatment, of the glass-ceramic. Compositions were prepared by mixing jarosite waste with granite scraps and glass cullet, yielding three different glass-batchs, melted at 1450°C, quenched and thermal treated to obtain glass-ceramics with different degrees of crystallisation. Density measurements were carried out by means of a helium displacement pycnometer. The results were compared with the degree of crystallisation as evaluated by XRD and showed a good agreement. The method is applicable if the variation of density connected to the phase transformation is sufficiently large. In the formation of pyroxene and magnetite phases, with large density variation compared to the parent glass, it is precise and easily applicable.