Influences of Melting Atmospheres on Content and Stability of Hydroxyl in Silica Glass

Abstract

Abstract: Taking type Ⅲ silica glass as the research object, from the perspective of actual experiment and melting, the content and distribution of hydroxyl along the radial direction in silica glass under different melting atmospheres were explored. A preliminary analysis was made on the formation and stability of the hydroxyl. Experimental results show that distribution of hydroxyl in silica glass under different melting atmospheres is high in the middle and low in the edge along the radial direction, and the content of hydroxyl is the lowest in neutral atmosphere and the highest in reducing atmosphere. The long-term stoppage and empty burning method improves the situation that the silica glass yield is low in the original oxidizing atmosphere, but it leads to uneven surface of the ingot surface, and the edge hydroxyl content increases significantly. The hydroxyl content of silica glass in different melting atmospheres tends to be the same after high-temperature heat treatment, and the decrease rate is the largest under reducing atmosphere, about 55%.

Key words: silica glass, silicon dioxide, hydroxyl, melting atmosphere, stability

CLC Number:

TQ171

XIAO Peng, WANG Yufen, XIANG Zaikui, NIE Lanjian, WANG Lei, SHAO Zhufeng, FU Bo, JIA Yanan, WANG Hui, WANG Hongjie, RAO Chuandong, ZHANG Chenyang. Influences of Melting Atmospheres on Content and Stability of Hydroxyl in Silica Glass[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(8): 2734-2739.

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