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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 >Dissolution of Na2O center dot CaO center dot nSiO(2) glasses in Na2CO3 solution for long-term and short-term experiments
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Dissolution of Na2O center dot CaO center dot nSiO(2) glasses in Na2CO3 solution for long-term and short-term experiments

机译：长期和短期实验中，Na2O中心点CaO中心点nSiO（2）玻璃在Na2CO3溶液中的溶解

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Dissolution of the glasses with compositions of Na2O (.) CaO (.) nSiO(2) (n = 2.5-6) in 0.5 M Na2CO3 solution was studied experimentally. The experiments were carried out with autoclaves under the conditions of the autogeneous pressure, 150 degrees C, and durations from 16 hours to 60 days. Experimental results show that the dissolution rate is increased with the increase of silica-content of the glass, especially in long-term ones. By comparison, the dissolution rate is significantly slower in long-term experiments than in short-term ones. During dissolution, the surface reaction generally plays the main role in short-term experiments, whereas in long-term ones, the solid diffusion and the surface reaction may both act significantly. In this kind of alkaline solution, percentage of Ca would be rich on the glass surface, and Na/Si depletion occurred. As the solution was renewed in short-term systems, the dissolution rate of Na was faster than Si on the glass surface. While the precipitation occurred, Si were consumed by the precipitated phases continuously and therefore the depletion of Si became more obviously. In addition, the high-Si glasses own higher dissolution rates than low-Si ones in long-term experiments, because the minerals growing on the low-Si glasses are closed and they prevent the reaction solution and glass. (c) 2005 Elsevier B.V. All rights reserved.
机译：实验研究了Na2O（。）CaO（。）nSiO（2）（n = 2.5-6）组成的玻璃在0.5 M Na2CO3溶液中的溶解度。用高压釜在自生压力，150℃，持续时间16小时至60天的条件下进行实验。实验结果表明，溶解速率随玻璃中二氧化硅含量的增加而增加，尤其是长期使用时。相比之下，长期实验中的溶出速率明显低于短期实验中的溶出速率。在溶解过程中，表面反应通常在短期实验中起主要作用，而在长期实验中，固体扩散和表面反应均可能起重要作用。在这种碱性溶液中，Ca的百分比会在玻璃表面富集，并且会发生Na / Si耗尽。随着溶液在短期系统中的更新，Na在玻璃表面的溶解速率比Si快。在发生析出的同时，Si被析出相连续消耗，因此Si的消耗变得更加明显。另外，在长期实验中，高硅玻璃的溶解速率高于低硅玻璃，这是因为在低硅玻璃上生长的矿物质是封闭的，它们阻止了反应溶液和玻璃。 （c）2005 Elsevier B.V.保留所有权利。

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