JPH0459624A - Silica glass manufacturing method - Google Patents

Abstract

PURPOSE:To obtain silica glass in higher yield through a sol-gel process by drying a wet gel under specified conditions to free said wet gel from the temperature difference between its inside and outside during drying leading to reduced crack development. CONSTITUTION:The objective silica glass is produced through a sol-get process using silica fine particles. During this process, a wet get is dried at 20-30 deg.C to decrease the temperature difference between its inside and outside (namely, decrease the density difference between them) leading to reduced crack development.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a drying method during drying in a quartz glass manufacturing process by a sol-gel method using silica fine particles.

[Prior Art 1 Drying process is one of the important processes in the production of glass by the sol-gel method. Various drying methods have been used in the past, but the current state of the art is that there is not much progress in the technology for thick glass (15 mm or more).

Therefore, cracks often occur during drying, and the current situation is that only a few decent products are produced, which is a problem.

Therefore, there is a need for a gel drying method that can be vitrified without cracks.

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, there was a problem in that the yield was not increased due to the generation of cracks during drying in the silica glass manufacturing method using the sol-gel method. Therefore, the present invention aims to: 1) enable a drying method that does not generate cracks during drying; 2) produce crack-free quartz glass; and 3) necessarily reduce costs.

The purpose is to provide new glass products by setting issues such as... and exploring new sol-gel manufacturing methods.

[Means for Solving the Problems] The method for producing glass according to the present invention is characterized in that the drying temperature during drying is in the range of 20 degrees to 30 degrees.

[Function] According to the above-described method of the present invention, the wet gel can be dried by reducing the temperature difference between the inside and outside of the wet gel, so that the difference in density between the inside and outside of the gel is reduced, thereby eliminating the occurrence of cracks.

C Example] FIG. 1 is a graph of an example according to the present invention. (a)
is a front view of the gel, and (b) is a plan view. Point A is the center of the gel, and point B is the outer periphery of the gel. If the drying temperature is high, a temperature difference will occur between points A and B before the high drying temperature is reached, causing a change in reaction rate and a difference in density between the inside and outside, resulting in internal distortion of the gel and cracks. do. Experimentally, the drying temperature range is approximately 20 to 30 degrees without cracking. Furthermore, although not shown in the figure, if a gel that has been aged at a low temperature (10 degrees Celsius to 15 degrees Celsius) is dried at a low temperature, internal and external distortions will be considerably reduced, and a considerable effect in preventing cracks can be expected. This has been shown to be quite effective experimentally, as it brings about a synergistic effect between low-temperature aging and low-temperature drying.

〔Effect of the invention〕

As mentioned above, by using the sol-gel method using silica fine particles and setting the drying temperature to 20 degrees Celsius or 630 degrees Celsius, 1) the occurrence of cracks during drying is prevented, and 2) the drying yield is improved. Raise it.

3) And the cost was reduced6 It brought about effects such as...

[Brief explanation of drawings]

FIG. 1 is a diagram of an embodiment of the invention. Center of Agel B. Gel outer periphery that's all Higanjin Seiko Epson Corporation Agent: Patent attorney Kisanbe Suzuki (1 other person) (b) (a) Figure 1

Claims (2)

[Claims] (1) In a glass manufacturing method using sol-gel method using silica fine particles, the drying temperature is 20 degrees Celsius to 30 degrees Celsius.
A method for producing quartz glass characterized by making the quartz glass within the range of . (2) The method for producing quartz glass according to claim 1, characterized in that the aging temperature is in the range of 10 degrees Celsius to 15 degrees Celsius.