校正缺口环法评价石英玻璃管的高温弹性模量

doi:10.15541/jim20150002

摘要/Abstract

摘要：

石英玻璃管大量应用于化工、机械和光学等领域, 但由于缺少精准有效的高温弹性模量评价手段, 限制了其高温热应力分析和结构设计。最近发展起来的缺口环方法可测试玻璃管材的室温弹性模量, 但其在高温下的应用因变形测量困难而鲜有报道。本研究利用相对法解决高温缺口环变形测量的难题, 从而可以方便准确地计算出高温弹性模量。采用本方法测试石英玻璃管的弹性模量并探索其在室温至1200℃间的变化规律, 发现在800℃时达到最大值87.20 GPa, 而后缓慢下降, 1100℃以后开始急剧下降。本研究显示用校正后的缺口环法测试石英玻璃管的高温弹性模量值准确、可靠, 有望推广应用于评价其他脆性圆管材料的高温弹性模量。

关键词: 石英玻璃管, 高温, 弹性模量, 缺口环, 相对法

Abstract:

Quartz glass tubes are widely used in chemical, mechanical, optical, and other fields, especially for the cases of high temperature. However, scarcity of evaluation techniques of elastic modulus at high temperature causes a barrier for analysis of thermal stress and structure design. Although a split ring method has been used at room temperature, its application at high temperature is scarcely reported due to the difficulty of the deformation measurement. In this study, a combination of the split ring method and relative method was utilized to solve deformation measurement problem, thus evaluating the elastic modulus of quartz glass tubes at various temperatures. The results indicate that the elastic modulus datum increases from room temperature to 800℃, reaches the peak value of 87.20 GPa at 800℃, and then gradually decreases, and then sharply decreases when temperature higher than 1100℃. These results demonstrate that the quartz glass tube measurement by improved split ring method for determining high-temperature elastic modulus is accurate and reliable, which could be used to evaluate other brittle tubes at high temperature.

Key words: quartz glass tube, high temperature, elastic modulus, split ring, relative method

中图分类号:

TQ171

刘钊, 包亦望, 魏晨光, 万德田. 校正缺口环法评价石英玻璃管的高温弹性模量[J]. 无机材料学报, 2015, 30(8): 838-842.

LIU Zhao, BAO Yi-Wang, WEI Chen-Guang, WAN De-Tian. Evaluation of Elastic Modulus of Quartz Glass Tube at High Temperature by Modified Split Ring Method[J]. Journal of Inorganic Materials, 2015, 30(8): 838-842.

图/表 7

图1 缺口环加载前及加载过程中的变形示意图

Fig. 1 Schematic of split ring before and after loading

图2 对比圆板与缺口环试件的加载示意图

Fig. 2 Schematic of contrast disk and split ring sample before loading

图3 石英玻璃粉末的差示扫描量热曲线

Fig. 3 DSC curve of quartz glass powder

图4 石英玻璃缺口环试件在1000℃的载荷-位移曲线

Fig. 4 Load-displacement curve of quartz glass split ring sample at 1000℃

图5 本试验及资料[15]记载的石英玻璃缺口环试件单次升温加载的弹性模量

Fig. 5 Elastic modulus of quartz glass split rings heated and loaded by one time from this test and published data from quartz glass[15]

图6 石英玻璃缺口环试件三次升温加载的弹性模量

Fig. 6 Elastic modulus of quartz glass split ring heated and loaded at the first to the third time

图7 石英玻璃缺口环在不同温度加载后的外径变化照片

Fig. 7 Photograph of different quartz glass split rings, showing diameter changes after tests at different temperatures

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