文献类型：会议论文

英文题名：Study on the gel casting of fused silica glass

作者：Hu Yichen[1];Wang Zhongjian[1];Lu Hanying[1]

机构：[1]E China Univ Sci & Technol, Shanghai 200237, Peoples R China

会议论文集：Joint Conference of the International Symposium on Glass/Annual Meeting of the International-Commission-on-Glass

会议日期：APR 10-14, 2005

会议地点：Shanghai, PEOPLES R CHINA

语种：英文

外文关键词：silica; organic-inorganic hybrids; sol-gels (xerogels); solution chemistry

摘要：Slip casting process is usually applied for the forming of fused silica products. Segregation always occurs and it will results in density deviation. By using gel casting process, green is fabricated by means of in situ polymerization with a three-dimensional network, holding the particles together and eliminating the tendency of migration. To prepare gel casting slurries, premix solutions were composed of acrylamide and N,N'-methylenebisacrylamide. Solid loading was kept 60% and the average particle size of silica powder 8-8.5 mu m. Lactic acid was introduced as a dispersant to regulate the pH value 3-4. Mechanism of the dispersant was investigated by studying zeta-potential at different pH. Ammonium persulfate (NH4)(2)S2O4 was added as an initiator. Gelation took place with the help of initiator at 50-60 degrees C. Nanometer silica was introduced to boost sinterability so that the density and bending strength of fused silica ceramics have been increased to 2.1 g/cm(3) and 40 Mpa, respectively. (c) 2007 Elsevier B.V. All rights reserved.