GB498724A - Improvements in and relating to electric insulation - Google Patents
Improvements in and relating to electric insulationInfo
- Publication number
- GB498724A GB498724A GB6836/38A GB683638A GB498724A GB 498724 A GB498724 A GB 498724A GB 6836/38 A GB6836/38 A GB 6836/38A GB 683638 A GB683638 A GB 683638A GB 498724 A GB498724 A GB 498724A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fused
- magnesia
- coating
- magnesium
- heating
- 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
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B33/00—Clay-wares
- C04B33/02—Preparing or treating the raw materials individually or as batches
- C04B33/13—Compounding ingredients
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Dispersion Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Resistance Heating (AREA)
Abstract
Fused magnesium oxide having a moisture-resistant electrically insulating coating is obtained by mixing a preponderant proportion of the magnesium oxide with a minor proportion of an inorganic material, and heating the mixture to a temperature at which the magnesia reacts with the inorganic material to form a fused coating of the desired kind. The heating must not result in the fusion of the magnesia, and is effected for such a period of time that, on cooling and comminuting the resultant mass, the individual particles of fused magnesia are protectively coated with a stable reaction product. If necessary the firing is repeated. Suitable additions to form the coating are silica, e.g. diatomaceous earth, silicates such as hydrous aluminium silicate, e.g. kaolin, or hydrous magnesium silicate, e.g. talc, if desired with oxide of calcium, magnesium, beryllium, aluminium, or zirconium. The product may be used in the manufacture of electric heaters, or for other insulating purposes, if desired, in admixture with waxes, pitches, resins, varnishes, mica, asbestos, lead borate or other materials. Specifications 144,767, [Class 37], and 413,905 are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US498724XA | 1918-04-29 | 1918-04-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB498724A true GB498724A (en) | 1939-01-12 |
Family
ID=21962179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB6836/38A Expired GB498724A (en) | 1937-03-19 | 1938-03-04 | Improvements in and relating to electric insulation |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR498724A (en) |
| GB (1) | GB498724A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129774A (en) * | 1975-08-28 | 1978-12-12 | Hitachi Heating Appliances Co., Ltd. | Filling materials for heating elements |
| GB2206875A (en) * | 1987-06-19 | 1989-01-18 | Ube Industries | Magnesia granule and process for producing same |
-
1919
- 1919-04-28 FR FR498724D patent/FR498724A/en not_active Expired
-
1938
- 1938-03-04 GB GB6836/38A patent/GB498724A/en not_active Expired
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4129774A (en) * | 1975-08-28 | 1978-12-12 | Hitachi Heating Appliances Co., Ltd. | Filling materials for heating elements |
| GB2206875A (en) * | 1987-06-19 | 1989-01-18 | Ube Industries | Magnesia granule and process for producing same |
| GB2206875B (en) * | 1987-06-19 | 1992-01-08 | Ube Industries | Magnesia granule and process for producing same |
Also Published As
| Publication number | Publication date |
|---|---|
| FR498724A (en) | 1920-01-21 |
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