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Roughening of Pristine Silica Glass Surface

原始二氧化硅玻璃表面的粗糙化

基本信息

批准号：
9616313
负责人：
Minoru Tomozawa
金额：
$ 29.8万
依托单位：
Rensselaer Polytechnic Institute
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
1997
资助国家：
美国
起止时间：
1997-03-15 至 2000-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9616313&HistoricalAwards=false
关键词：
Roughening Pristine Silica Glass Surface

项目摘要

9616313 Tomozawa The most popular explanation of mechanical fatigue in glasses is the slow growth of a surface crack promoted by the stress corrosion reaction of glass with water or water vapor. It has been reported, however, that silica glass optical fibers can be made flaw-free and that these pristine glasses can also exhibit mechanical fatigue. Recent observations by atomic force microscopy (AFM) of glass fiber surfaces showed that the initial strength degradation of optical fibers is due to surface roughening rather than crack propagation. Thus it is necessary to understand the mechanism and kinetics of surface roughening of pristine glass surface in order to predict the fatigue life time of optical fiber correctly. The initial stage of the surface roughening kinetics of silica glass with or without stress will be investigated using an atomic force microscope and will be compared with the theory for the surface roughness development such as the noise-induced roughening theory and the stress-induced roughening theory. %%% The long term mechanical stability of silica glass optical fiber is an important concern in optical communications. Life time prediction of optical fibers requires the understanding of the mechanism of mechanical fatigue. In spite of extensive investigations, the mechanism remains unclear. Recent observations by atomic force microscopy (AFM) of glass fiber surfaces showed that the initial strength degradation of optical fibers is due to surface roughening rather than crack propagation. Thus it is necessary to understand the mechanism and kinetics of surface roughening of pristine glass surface in order to predict the fatigue life time of optical fiber correctly. The initial stage of the surface roughening kinetics of silica glass will be investigated and will be compared with the theory for the surface roughness development. ***

小行星9616313 玻璃中机械疲劳最流行的解释是玻璃与水或水蒸气的应力腐蚀反应促进了表面裂纹的缓慢生长。然而，据报道，石英玻璃光纤可以制成无裂纹的，并且这些原始玻璃也可以表现出机械疲劳。最近通过原子力显微镜（AFM）对玻璃纤维表面的观察表明，光纤的初始强度退化是由于表面粗糙化而不是裂纹扩展。因此，为了正确预测光纤的疲劳寿命，有必要了解原始玻璃表面粗糙化的机理和动力学。初始阶段的表面粗糙化动力学的石英玻璃有或没有应力将使用原子力显微镜进行研究，并将与理论的表面粗糙度的发展，如噪声诱导的粗糙化理论和应力诱导的粗糙化理论进行比较。石英玻璃光纤的长期机械稳定性是光通信中的一个重要问题。光纤的寿命预测需要了解机械疲劳的机理。尽管进行了广泛的调查，但其机制仍不清楚。最近通过原子力显微镜（AFM）对玻璃纤维表面的观察表明，光纤的初始强度退化是由于表面粗糙化而不是裂纹扩展。因此，为了正确预测光纤的疲劳寿命，有必要了解原始玻璃表面粗糙化的机理和动力学。石英玻璃的表面粗糙化动力学的初始阶段将进行研究，并将与表面粗糙度发展的理论进行比较。 ***