GB1209780A - Transparent polycrystalline beryllia - Google Patents
Transparent polycrystalline berylliaInfo
- Publication number
- GB1209780A GB1209780A GB5816167A GB5816167A GB1209780A GB 1209780 A GB1209780 A GB 1209780A GB 5816167 A GB5816167 A GB 5816167A GB 5816167 A GB5816167 A GB 5816167A GB 1209780 A GB1209780 A GB 1209780A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oxide
- beryllia
- beryllium
- transparent polycrystalline
- beo
- 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
- C04B35/08—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 beryllium oxide
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Abstract
1,209,780. Transparent polycrystalline beryllia. NIPPON GAISHI K.K. 21 Dec., 1967 [22 March, 1967; 8 Sept., 1967], No. 58161/67. Heading C1A. A transparent polycrystalline beryllia body consists of BeO containing as an addition substance 0À01-1 wt. per cent of at least one colourless oxide whose melting-point is at least 1500‹ C., the density of the body is at least 99% of the maximum theoretical density, and the inline transmission of radiant energy per mm. of thickness of the beryllia is at least 10% in the wavelength range 0À003-6Á. The said oxide may be that of Li, Mg, Al, Si, Ca, Ti, Sr, Y, Zr, Mo, La, or Th, or a mixture of any of these. A mixed powder of BeO and oxide may be prepared and sintered at 1400-1900‹ C., the mixed powder being prepared by calcining at less than 1300‹ C. either (a) beryllium hydroxide, acetate, carbonate, or sulphate plus the oxide, (b) beryllium oxide plus the appropriate metal nitrite, sulphate, or acetate or (c) a mixture of beryllium salts and metal salts. The sintering is carried out in a vacuum, or in a hydrogen atmosphere containing less than 1% moisture, and may be preceded by pre-sintering at 1000- 1500‹ C. for at least one hour.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1736467 | 1967-03-22 | ||
| JP5726567 | 1967-09-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1209780A true GB1209780A (en) | 1970-10-21 |
Family
ID=26353869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5816167A Expired GB1209780A (en) | 1967-03-22 | 1967-12-21 | Transparent polycrystalline beryllia |
Country Status (3)
| Country | Link |
|---|---|
| DE (1) | DE1646826B2 (en) |
| FR (1) | FR1552389A (en) |
| GB (1) | GB1209780A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU596660B2 (en) * | 1985-11-27 | 1990-05-10 | Cbl Ceramics Limited | Ceramics |
-
1967
- 1967-12-21 GB GB5816167A patent/GB1209780A/en not_active Expired
-
1968
- 1968-01-11 FR FR1552389D patent/FR1552389A/fr not_active Expired
- 1968-01-18 DE DE19681646826 patent/DE1646826B2/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU596660B2 (en) * | 1985-11-27 | 1990-05-10 | Cbl Ceramics Limited | Ceramics |
| US4981823A (en) * | 1985-11-27 | 1991-01-01 | Cbl Ceramics Limited | Beryllium oxide based ceramics |
Also Published As
| Publication number | Publication date |
|---|---|
| DE1646826A1 (en) | 1971-08-26 |
| DE1646826B2 (en) | 1972-08-17 |
| FR1552389A (en) | 1969-01-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |