Isothermal sintering with concurrent crystallization of polydispersed soda–lime–silica glass beads
Isothermal sintering with concurrent crystallization of polydispersed soda–lime–silica glass beads
复制标题
多分散钠钙硅玻璃珠的等温烧结与同步结晶
DOI：
10.1016/j.jnoncrysol.2003.08.076
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发表时间：
2003
影响因子：
3.5
通讯作者：
Edgar Dutra Zanotto
中科院分区：
文献类型：
--
作者：
M. Prado;C. Fredericci;Edgar Dutra Zanotto
先前开发的簇模型用于描述同时进行表面结晶的多分散粉末的粘性烧结动力学，并在脱氮球形玻璃颗粒压块的等温烧结实验中进行了测试。实验在不同温度下进行，以改变烧结和结晶的相对动力学。计算中考虑了粘度、玻璃蒸气表面能、粒径分布、每个颗粒周围的平均邻居数、颗粒与样品尺寸比以及预先存在的表面晶体对烧结动力学的影响。该模型描述了两种不同尺寸分布下一系列温度下的实验烧结动力学，并预测了由于预先存在的表面晶体和表面结晶而导致的致密化饱和度。计算和实验结果证实，较高的温度有利于烧结而不是结晶。
The Clusters model, previously developed to describe the viscous sintering kinetics of polydispersed powders undergoing simultaneous surface crystallization, was tested in isothermal sintering experiments of devitrifying spherical glass particle compacts. The experiments were conducted at different temperatures to vary the relative kinetics of sintering and crystallization. The viscosity, glass–vapor surface energy, particle size distribution, average number of neighbors around each particle, particle to sample size ratio, and the effect of pre-existing surface crystals on the sintering kinetics were determined and taken into account in the calculations. The model describes the experimental sintering kinetics for a series of temperatures for two different size distributions and predicts the saturation of densification due to pre-existing surface crystals and surface crystallization. The calculations and experimental results confirmed that higher temperatures benefit sintering over crystallization.