Method of producing porous glass
A technology of porous glass and glass, applied in the field of preparation of porous glass, can solve the problems of accelerating the removal or prevention of gelatinous silica, not disclosed, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0024] According to the present invention, the preparation method of porous glass comprises: immersing phase-separated glass in a bath containing an acid solution; setting the angle θ formed by the surface of the phase-separated glass to be porous and the surface of the bath liquid to 10°- 90°; and irradiating the bath with ultrasonic waves to etch the phase-separated glass, thereby obtaining the porous glass.
[0025] A known material for producing porous glass utilizing a phase separation phenomenon is, for example, borosilicate glass mainly containing silicon oxide, boron oxide, and alkali metal oxide and used as a starting material. Usually, SiO 2 , B 2 o 3 and M 2 The weight ratio of O (M is an alkali metal element) represents borosilicate glass.
[0026] Borosilicate glass with a specific composition undergoes a phase separation phenomenon in which during the application of heat the glass separates into a silica vitreous phase mainly containing silicon oxide and a bo...
preparation example 1-3）
[0047] To illustrate examples and comparative examples of the present invention, phase-separated glasses were prepared with oxide compositions as shown in Table 1. As material compounds of silicon, boron, sodium, and aluminum, respectively, silicon dioxide powder (SiO 2 ), boron oxide (B 2 o 3 ), sodium carbonate (Na 2 CO 3 ) and alumina (Al 2 o 3 ). The mixed powder of each material compound was placed in a platinum crucible and melted at 1500° C. for 24 hours. Then, the temperature was lowered to 1300°C, and the product was poured into graphite molds. The mold was cooled in air for 20 minutes to obtain borosilicate glass.
[0048] The borosilicate glass block thus obtained was cut into 40 mm x 30 mm x 13 mm, and both surfaces were ground to mirror-finished surfaces. The glass thus processed was subjected to a phase separation treatment in an electric furnace under each condition shown in Table 2.
[0049] Table 1
[0050] glass name
SiO 2 wt%
B ...
Embodiment 1）
[0054] Glass etching was performed using the phase-separated glass of Preparation Example 1. A sample to be used was obtained by cutting the phase-separated glass into 15 mm×15 mm.
[0055] In etching with acid, 50 g of 1 mol / L nitric acid was used as the acid solution. Nitric acid was put in a container made of polypropylene, and the phase-separated glass suspended on a platinum wire was immersed so that the angle θ formed by the surface of the phase-separated glass and the surface of the liquid became 90° and the phase-separated glass Place in the center of the solution. The polypropylene container was covered and ultrasonic waves were applied from below the solution. The ultrasonic waves applied had an ultrasonic output of 130 W and an oscillation frequency of 42 kHz. After 2.5 hours of treatment, the acid etched glass was placed in water and rinsed for 90 minutes.
[0056] By observation with SEM, it was found that the range of porosity was about 600 μm in the depth di...
PUM
| Property | Measurement | Unit |
|---|---|---|
| diameter | aaaaa | aaaaa |
| thickness | aaaaa | aaaaa |
| diameter | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More