GB344572A - Improvements in the manufacture of refractory articles - Google Patents
Improvements in the manufacture of refractory articlesInfo
- Publication number
- GB344572A GB344572A GB39475/29A GB3947529A GB344572A GB 344572 A GB344572 A GB 344572A GB 39475/29 A GB39475/29 A GB 39475/29A GB 3947529 A GB3947529 A GB 3947529A GB 344572 A GB344572 A GB 344572A
- Authority
- GB
- United Kingdom
- Prior art keywords
- plunger
- powder
- article
- refractory
- class
- 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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
- H01J9/02—Manufacture of electrodes or electrode systems
- H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
Abstract
344,572. Refractory articles ; discharge apparatus. WESTINGHOUSE LAMP CO., Bloomfield, New Jersey, U.S.A. -(Assignees of Iredell, C. V.; 376, Prospect Street, East Orange, New Jersey, U.S.A.) Dec. 24, 1929, No. 39475. Convention date, Dec. 29, 1928. [Classes 22 and 87 (ii).] Refractory insulating articles are made from powdered refractory material, such as alumina, magnesia, zirconia, thoria, silica, zirconium silicate, magnesium silicate, &c., by adding a normally non-fluid temporary binder of organic waxy material such as paraffin wax or beeswax, moulding the dry mixture to shape under pressure, and firing. The refractory material is preferably prefired to approximately the maximum temperature at which the formed articles are to be used. The wax may be added in solution, the solvent being dried off before the moulding operation. In an. example refractory support members 1, Fig. 4, for the indirectly-heated cathode 2 of vacuum tube apparatus described in Specification 315,375, [Class 39 (i), Electric lamps, Arc. &c.], are formed from a mixture of 98 per cent of alumina which has been prefired for a prolonged period, and 2 per cent of talc. This mixture is milled to pass a 100-mesh screen and the powder is mixed with a solution of 8 grams of paraffin in 200 to 400 c.c. of ether in such proportion as to give about 8 per cent by weight of paraffin to powder. The powder is then air-dried and re-screened. The article is moulded in a press comprising a die 7, Fig. 1, a bottom plunger 17 and a top plunger 13 having a thin extension 16 adapted to enter a boring 19 in the bottom plunger. With the bottom plunger in the position shown, the die is filled with powder and the top plunger is forced down to form the article 1. The top plunger is then raised and the formed article is ejected by upward movement of the bottom plunger 17. The article is then fired in a hydrogen atmosphere at 1500-1650‹ C. Specifications 23071/08, [Class 87, Moulding &c.], and 223,573, [Class 22, Cements &c.], also are referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US344572XA | 1928-12-29 | 1928-12-29 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB344572A true GB344572A (en) | 1931-03-12 |
Family
ID=21876542
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB39475/29A Expired GB344572A (en) | 1928-12-29 | 1929-12-24 | Improvements in the manufacture of refractory articles |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB344572A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE741396C (en) * | 1937-07-17 | 1943-11-10 | Sueddeutsche Telefon App Kabel | Process for the production of insulated coiled heating wires for indirectly heated cathodes |
| FR2525810A1 (en) * | 1982-04-23 | 1983-10-28 | Raytheon Co | METHOD FOR MANUFACTURING A CATHODE ELECTRODE FOR ELECTRON DISCHARGE APPARATUS AND ELECTRODE OBTAINED BY THIS METHOD |
-
1929
- 1929-12-24 GB GB39475/29A patent/GB344572A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE741396C (en) * | 1937-07-17 | 1943-11-10 | Sueddeutsche Telefon App Kabel | Process for the production of insulated coiled heating wires for indirectly heated cathodes |
| FR2525810A1 (en) * | 1982-04-23 | 1983-10-28 | Raytheon Co | METHOD FOR MANUFACTURING A CATHODE ELECTRODE FOR ELECTRON DISCHARGE APPARATUS AND ELECTRODE OBTAINED BY THIS METHOD |
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