GB546641A - Improvements in and relating to an electrical insulating material and method of producing the same - Google Patents
Improvements in and relating to an electrical insulating material and method of producing the sameInfo
- Publication number
- GB546641A GB546641A GB15401/40A GB1540140A GB546641A GB 546641 A GB546641 A GB 546641A GB 15401/40 A GB15401/40 A GB 15401/40A GB 1540140 A GB1540140 A GB 1540140A GB 546641 A GB546641 A GB 546641A
- Authority
- GB
- United Kingdom
- Prior art keywords
- per cent
- iron
- insulating material
- electrical insulating
- metallic iron
- 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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/03—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Insulating Materials (AREA)
Abstract
546,641. Electrical insulating material. NORTON CO. Oct. 17, 1940, No. 15401. Convention date, Oct. 27, 1939. [Class 22] A refractory insulating material comprises crystalline magnesia in granular form containing 0.3-5 per cent. by weight of silica and 0.5-3 per cent. of lime and its total iron content, calculated as ferric oxide, is less than 0.2 per cent. by weight and is substantially free from metallic iron and its lower oxides. The raw magnesia containing not over 0.5 per cent. of iron oxide, together with silica and lime is melted and crystallized, crushed to a granular condition, metallic iron and magnetic oxide of iron are removed and the material is roasted under oxidizing conditions. The fusion may be at a temperature (above 2600‹C.) high enough to boil off metallic iron. After crystallization the outer zone and the extreme centre or pipe of the ingot are removed and discarded. Specification 546,642, is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US546641XA | 1939-10-27 | 1939-10-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB546641A true GB546641A (en) | 1942-07-23 |
Family
ID=21992674
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB15401/40A Expired GB546641A (en) | 1939-10-27 | 1940-10-17 | Improvements in and relating to an electrical insulating material and method of producing the same |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB546641A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103922615A (en) * | 2014-03-27 | 2014-07-16 | 沈阳化工大学 | Method for preparing high-grade electrical-grade magnesium oxide from low-grade fused magnesium oxide |
-
1940
- 1940-10-17 GB GB15401/40A patent/GB546641A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103922615A (en) * | 2014-03-27 | 2014-07-16 | 沈阳化工大学 | Method for preparing high-grade electrical-grade magnesium oxide from low-grade fused magnesium oxide |
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