| (19) |
 |
|
(11) |
EP 0 248 397 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
02.05.1990 Bulletin 1990/18 |
| (43) |
Date of publication A2: |
|
09.12.1987 Bulletin 1987/50 |
| (22) |
Date of filing: 02.06.1987 |
|
|
| (84) |
Designated Contracting States: |
|
DE ES FR IT SE |
| (30) |
Priority: |
05.06.1986 US 871182
|
| (71) |
Applicant: WESTINGHOUSE ELECTRIC CORPORATION |
|
Pittsburgh
Pennsylvania 15222 (US) |
|
| (72) |
Inventors: |
|
- Worcester, Samuel Austin
Ogden
Utah 84403 (US)
- Kwon, Young Jin
Fruit Heights
Utah 84037 (US)
- Woods, Charles Robert
Ogden
Utah 84403 (US)
|
| (74) |
Representative: Stratmann, Ernst, Dr.-Ing. |
|
Schadowplatz 9
40212 Düsseldorf
40212 Düsseldorf (DE) |
|
| |
|
| (54) |
Prebaked zirconium for electron beam melted barrier tube shell material |
(57) Process for producing purified zirconium by baking a distilled sponge of zirconium
for at least one-half hour at 120-400°C and then EB melting the vacuum baked sponge,
preferably in a multiple swept beam electron beam furnace. Preferably a rotary feeder
type EB furnace is used such that the sponge can be baked and melted without being
consolidated into an electrode and preferably the distilled sponge is tested and sponge
having more than the desired oxygen level is rejected and only sponge having less
oxygen is selected for use as the distilled sponge to be baked and EB melted.