OBTAINING HIGH-QUALITY QUARTZ GLASS FROM SYNTHETIC SILICA,
Abstract
The effects of the purity and microstructure of synthetic silica on the quality of quartz glass was studied to define the significance of these factors in producing material for the optical and semiconductor industries. Commercial pure silica and especially pure silica obtained by hydrolysis of silicon tetrachloride were vacuum fused under identical conditions. Both feedstocks gave acceptable glasses of only slightly different content in metallic impurities, probably because of contamination by the melting apparatus. Silica prepared from ethyl silicate was pretreated at 700 or 500C, heated 2 hrs at 700, 900, 1100, 1300, or 1460, or 1460C, and vitrified under identical conditions. Changes in apparent and actual density, specific surface, and porosity of silica and the transparency and bubble content of the produced glasses were measured. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 10, 1968
- Accession Number
- AD0694391
Entities
People
- I. P. Ogloblina
- Yu. S. Stepanov
Organizations
- National Air and Space Intelligence Center