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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 >Surface tensile layer generation during thermal annealing of phosphate glass
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Surface tensile layer generation during thermal annealing of phosphate glass

机译：磷酸盐玻璃热退火过程中表面张力层的产生

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Surface tensile layers (up to 20 MPa) are generated during thermal annealing of metaphosphate glass in ambient air. The surface tensile stress is caused by changes in properties of the phosphate glass, particularly the glass transition temperature and the coefficient of thermal expansion. due to the glass reaction with water vapor and diffusion of OH groups into the region just below the surface (<2 mm). Pin increase in the OH content of the glass from about 80 to 5000 ppmw causes a decrease in the glass transition temperature from 468 to 405 degrees C and an increase in the linear thermal expansion coefficient from 12.9 to 14.2 x 10(-6) K-1. A mechanism for the generation of the tensile surface layer is proposed and simulated experimentally by fusion-bonding at 500 degrees C two samples of the same composition but with OH contents that differ by up to 50x, The stresses in the annealed fusion-bonded samples are determined from measured stress birefringence, Peak tensile stresses calculated by finite element analysis agree with measured values to within 30%. (C) 2000 Elsevier Science B.V. All rights reserved. [References: 24]
机译：在环境空气中偏磷酸盐玻璃的热退火过程中会产生表面拉伸层（最高20 MPa）。表面张力是由磷酸盐玻璃的性能变化引起的，特别是玻璃化转变温度和热膨胀系数。由于玻璃与水蒸气发生反应，并且OH基团扩散到表面正下方的区域（<2 mm）。玻璃中OH含量的引脚增加从约80 ppmw到5000 ppmw，导致玻璃化转变温度从468℃降低到405℃，线性热膨胀系数从12.9 x 14.2 x 10（-6）K-增加1。提出了一种产生拉伸表面层的机理，并通过在500摄氏度下对两个成分相同但OH含量相差高达50x的样品进行了熔合实验，并进行了实验模拟。退火后的熔合样品的应力为由测量的双折射确定，通过有限元分析计算的峰值拉伸应力与测量值相符，在30％以内。 （C）2000 Elsevier Science B.V.保留所有权利。 [参考：24]

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