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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Inhomogeneous glass surfaces resulting from rapid forming operations - evidence from differential corrosion
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Inhomogeneous glass surfaces resulting from rapid forming operations - evidence from differential corrosion

机译：快速成型操作导致玻璃表面不均匀-腐蚀差异证明

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摘要

A chemical compositional heterogeneity develops on glass surfaces which have experienced rapid expansion/stretching - as during the press or press/blow process used in forming. A differential etching technique using HF and HBF4 is developed to demonstrate that such heterogeneities occur on the surface of commercial articles such as soda-lime silicate tumblers. Comparison with articles exposed to aggressive conditions in a well-characterized dishwasher reveals that similar corrosion patterns appear in both cases - as alternatively corrodedon-corroded regions arranged as striations running vertically along the tumbler. Analysis of these striae by imaging ellipsometry and interferometry indicates that they consist of ridges 50-150 nm high in relief with a width and repeat distance of 0.05-0.15 mm. This pattern is in qualitative agreement with a recent physical modeling study and suggests that the ridges arise from durable low alkali glass which is at the surface of the gob/parison before the press/blow and which has been striated by less durable, high alkali glass from the interior of the gob. Under corrosive conditions, the alkali-rich glass dissolves away to leave behind the durable ridge. (C) 2004 Elsevier B.V. All rights reserved.
机译：在经历快速膨胀/拉伸的玻璃表面上会形成化学成分的异质性，例如在成型过程中使用的压制或压制/吹塑过程中。开发了一种使用HF和HBF4的差分蚀刻技术，以证明这种异质性出现在诸如钠钙硅酸盐玻璃杯等商品的表面上。与在特征充分的洗碗机中暴露于侵蚀性条件的物品的比较表明，在两种情况下都出现相似的腐蚀模式-交替排列的腐蚀/未腐蚀区域为沿着滚筒沿竖向延伸的条纹。通过椭圆偏振成像法和干涉测量法对这些条纹的分析表明，它们由凹凸高50-150 nm的脊组成，脊的宽度和重复距离为0.05-0.15 mm。这种图案与最近的物理模型研究在质量上吻合，并表明这些凸脊来自耐用的低碱玻璃，该低碱玻璃在压制/吹塑之前位于料滴/型坯的表面，并已被较不耐用的高碱玻璃条纹从采空区的内部。在腐蚀性条件下，富含碱的玻璃会溶解掉，留下坚固的脊。 （C）2004 Elsevier B.V.保留所有权利。

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