| 摘要 |
PURPOSE:To easily produce a thick-walled glass tube by rotating a vessel charged with a pH-controlled sol with the axis of a cylinder as the center, and forming a wet gel having specified thickness. CONSTITUTION:Hydrochloric acid is added to ethyl silicate and strongly agitated, the obtained colorless, transparent, and homogeneous soln. is added with ultra-fine silica powder, and the pH is regulated to obtain a sol. The sol is charged into a vessel 1, a lid 2 is put on, the vessel is mounted on a planar rotary device 3 and rotated with the axis of the cylinder as the center, hence the sol is gelated, and a wet gel having >=2cm thickness is obtained. Then the wet gel is dried and sintered. Consequently, the wet gel is never cracked during aging the drying, and a glass tube having >=1cm thickness is obtained after sintering. |
