GB568469A - Improvements in glass of low thermal expansion - Google Patents
Improvements in glass of low thermal expansionInfo
- Publication number
- GB568469A GB568469A GB1077543A GB1077543A GB568469A GB 568469 A GB568469 A GB 568469A GB 1077543 A GB1077543 A GB 1077543A GB 1077543 A GB1077543 A GB 1077543A GB 568469 A GB568469 A GB 568469A
- Authority
- GB
- United Kingdom
- Prior art keywords
- glass
- oxide
- per cent
- thermal expansion
- low thermal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B5/00—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture
- C03B5/02—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating
- C03B5/027—Melting in furnaces; Furnaces so far as specially adapted for glass manufacture in electric furnaces, e.g. by dielectric heating by passing an electric current between electrodes immersed in the glass bath, i.e. by direct resistance heating
Abstract
568,469. Glass. GENERAL ELECTRIC CO., Ltd., and PARTRIDGE, J. H. July 2, 1943, No. 10775. Drawings to Specification. [Class 56] A glass of low thermal expansion (e.g. between 0.8Î10<-6> and 1.5Î10<-6> per degree centigrade) which in founding is maintained at nearly 2000‹ C. for 24 hours or more is composed mainly of SiO2 and Al2O3 to which a small percentage of an alkaline earth oxide is added. Barium oxide is the preferred oxide ; not more than 1¢ per cent, and preferably only “ per cent, is used. 10 to 15 per cent of the SiO2 may be replaced by boric oxide. The addition of the BaO appreciably increases the electrical conductivity of the glass at 2000‹ C. which reduces the power necessary for the heating which is carried out in part by the passage of current through immersed tungsten electrodes and in part by oxy-coal-gas flames playing over the surface of the glass. The furnace is lined with zircon blocks. Specifications 463,889 and 467,362 are referred to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1077543A GB568469A (en) | 1943-07-02 | 1943-07-02 | Improvements in glass of low thermal expansion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1077543A GB568469A (en) | 1943-07-02 | 1943-07-02 | Improvements in glass of low thermal expansion |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB568469A true GB568469A (en) | 1945-04-06 |
Family
ID=9974034
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1077543A Expired GB568469A (en) | 1943-07-02 | 1943-07-02 | Improvements in glass of low thermal expansion |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB568469A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2523030A (en) * | 1948-10-30 | 1950-09-19 | Glass Fibers Inc | Electric glass furnace |
| US2600490A (en) * | 1947-04-21 | 1952-06-17 | Corning Glass Works | Glass melting method |
| DE1015989B (en) * | 1953-08-03 | 1957-09-19 | Harvey Larry Penberthy | Electrode arrangement in glass melting furnaces |
| EP0078715A1 (en) * | 1981-11-04 | 1983-05-11 | Corning Glass Works | Glass-melting furnaces |
-
1943
- 1943-07-02 GB GB1077543A patent/GB568469A/en not_active Expired
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2600490A (en) * | 1947-04-21 | 1952-06-17 | Corning Glass Works | Glass melting method |
| US2523030A (en) * | 1948-10-30 | 1950-09-19 | Glass Fibers Inc | Electric glass furnace |
| DE1015989B (en) * | 1953-08-03 | 1957-09-19 | Harvey Larry Penberthy | Electrode arrangement in glass melting furnaces |
| EP0078715A1 (en) * | 1981-11-04 | 1983-05-11 | Corning Glass Works | Glass-melting furnaces |
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