Glass manufacturing – Processes – Forming product or preform from molten glass
Patent
1984-08-03
1986-08-12
Schor, Kenneth M.
Glass manufacturing
Processes
Forming product or preform from molten glass
65 17, 65 181, C03B 1906, C03B 37016
Patent
active
046054286
ABSTRACT:
High silica glass is formed by sintering a dried gel. The gel has a pore size distribution such that at most about 5% of the total pore volume is contributed by pores having an effective pore diameter greater than about 0.5 .mu.m, and such that at least 10% of the total pore volume is contributed by pores having an effective pore diameter greater than about 0.02 .mu.m. This pore size distribution permits effective migration of fluid into, and out of, the gel, permits sintering at a lower temperature, and results in increased perfection of the glass. The pore size distribution can be achieved by appropriate comminution, e.g., ball-milling, of intermediate material. A novel process for forming high silica glass is also disclosed. The process comprises forming intermediate material by hydrolysis of one or more metal alkoxides, comminuting the intermediate material to produce colloidal particles, forming a sol by dispersing the particles in liquid, gelling the sol, drying the gel, and sintering the dried gel.
REFERENCES:
patent: 4419115 (1983-12-01), Johnson et al.
Journal of Non-Crystalline Solids 63 (1984), North Holland, Amsterdam, "Sol-Gel Preparation of Transparent Silica Glass", pp. 155-161, by E. M. Rabinovich et al.
Treatise on Materials Science and Technology, vol. 22, 1982, "Gel Making for Making Glass" by S. Sakka, pp. 129-167.
Advanced Experimental Techniques in Powder Metallurgy, vol. 5 (1970) J. S. Hirschhorn and K. H. Roll, editors, "A Review of Mercury Porosimetry" by H. M. Rootare, pp. 225-252.
Journal of the American Ceramic Society, vol. 66, No. 10 Oct. 1983, "Preparation of High-Silica Glasses from Colloidal Gels: I, Preparation for Sintering and Properties of Sintered Glass" pp. 683-688, by E. M. Rabinovich et al.
Johnson, Jr. David W.
MacChesney John B.
Rabinovich Eleizer M.
AT&T Bell Laboratories
Pacher Eugen E.
Schor Kenneth M.
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