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首页> 外文期刊>Materials Science and Engineering >Indentation recovery of soda-lime silicate glasses containing titania, zirconia and hafnia at low temperatures
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Indentation recovery of soda-lime silicate glasses containing titania, zirconia and hafnia at low temperatures

机译：低温下含有二氧化钛，氧化锆和氧化f的钠钙硅酸盐玻璃的压痕恢复

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From thermal treatment of indentations made on glass, the densification contribution to the total indentation deformation can be estimated. In this work, we studied the physico-mechanical properties and low-temperature indentation recovery of soda-lime silicate glasses with the composition of (in wt%) 73SiO_2-12CaO-15Na_2O-xTiO_2 (ZrO_2 or HfO_2), where x is 0,1, 2, 4 and 8. The obtained results demonstrated that the addition of group IV B metal oxides (TiO_2, ZrO_2 and HfO_2) into soda-lime silicate glass increased density, elastic moduli, Vickers hardness and brittleness due to the higher atomic weight of additives, increased network connectivity, higher strength of individual bonds formed and lower molar volume, respectively. Indentation recovery of glass samples containing 8 wt% TiO_2 (G5), 8 wt% ZrO_2 (G9) and 8 wt% HfO_2 (G13) was comparatively estimated with that of a pure soda-lime silicate glass (G1), as a reference, on the basis of the depth change of indentation impressions at low temperatures, 25 ℃ and 100 ℃, for different periods with a maximum of 48 h. It was found that the higher indentation recovery for all four samples was observed at both temperatures within the first 6 h due to stored strain energy in deformation zone but equilibrium was not reached even after 48 h because of low thermal treatment temperatures, which generally provide a thermodynamic driving force to recover. According to the glass composition, the indentation recovery rate follows the order: G13
机译：通过对玻璃上的压痕进行热处理，可以估算致密化对总压痕变形的影响。在这项工作中，我们研究了组成为（wt％）73SiO_2-12CaO-15Na_2O-xTiO_2（ZrO_2或HfO_2）（x为0）的钠钙硅酸盐玻璃的物理力学性能和低温压痕恢复。 1、2、4和8。获得的结果表明，向钠钙​​硅酸盐玻璃中添加IV B类金属氧化物（TiO_2，ZrO_2和HfO_2）可提高密度，弹性模量，维氏硬度和脆性，原因是原子量较高添加剂，增加的网络连通性，形成的单个键的强度更高和摩尔量更低。以纯钠钙硅酸盐玻璃（G1）为基准，比较估计了包含8 wt％TiO_2（G5），8 wt％ZrO_2（G9）和8 wt％HfO_2（G13）的玻璃样品的压痕恢复，根据压痕压痕在不同温度下（25℃和100℃）的深度变化，最长不超过48小时。结果发现，由于变形区中储存的应变能，在最初的6h内在两个温度下都观察到了所有四个样品的更高的压痕恢复率，但是由于低的热处理温度，甚至在48h后也没有达到平衡，这通常提供热力学驱动力得以恢复。根据玻璃组成，压痕恢复率遵循以下顺序：G13 ＜G9 ＜G5 ＜G1，这主要归因于随着引入钠钙硅酸盐玻璃的四价金属阳离子的尺寸增加，致密化降低。实验玻璃上的所有压痕均表现出三个共同的特征：弹性，粘弹性和可塑性。

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