Title:
高温運転のための誘導炉
Document Type and Number:
Japanese Patent JP2005521855
Kind Code:
A
Abstract:
An induction furnace capable of operation at temperatures of over 3100° C. has a cooling assembly ( 60 ), which is selectively mounted to an upper end of the furnace wall ( 76 ). The cooling assembly includes a dome ( 62 ), which is actively cooled by cooling water coils ( 68 ). During the cool-down portion of a furnace run, cooling initially proceeds naturally, by conduction of heat away from the hot zone through a furnace insulation layer ( 58 ). Once the temperature within the furnace hot zone ( 20 ) reaches about 1500° C., a lifting mechanism ( 80 ), mounted to the dome, raises a cap ( 16 ) of the furnace slightly, allowing hot gases from the hot zone to mix with cooler gas in the dome. This speeds up cooling of the hot zone, reducing cool-down times significantly, without the need for encumbering the furnace itself with valves or other complex cooling mechanisms which have to be replaced periodically. The life of a graphite furnace susceptor ( 10 ) at the high operating temperature is increased by surrounding the susceptor with a barrier layer ( 40 ) of flexible graphite, which inhibits evaporation of the graphite. Additionally, witness disks ( 154 ), placed within the susceptor, provide an accurate temperature profile of the hot zone.
Inventors:
Douglas, Jay Miller
Warner, H. Ruoff
Alan, W. Intermill
Thomas, Earl Toman
Richard, El. Xiao
Stephen Elle Strong
Warner, H. Ruoff
Alan, W. Intermill
Thomas, Earl Toman
Richard, El. Xiao
Stephen Elle Strong
Application Number:
JP2003584594A
Publication Date:
July 21, 2005
Filing Date:
April 03, 2003
Export Citation:
Assignee:
UCAR CARBON COMPANY INC.
International Classes:
C01B31/04; D01F9/32; F27B14/06; F27B17/00; F27D1/12; F27D7/06; H05B6/10; F27D11/06; F27D21/00; F27D9/00; F27D99/00; (IPC1-7): F27B17/00; F27D1/12; F27D11/06; F27D21/00; H05B6/10
Domestic Patent References:
| JPH03255885A | 1991-11-14 | |||
| JP2511100Y2 | 1996-09-18 |
Foreign References:
| US3408470A | 1968-10-29 | |||
| US2181092A | 1939-11-21 |
Attorney, Agent or Firm:
Kenji Yoshitake
Hiroyuki Nagai
Junpei Okada
Hirohito Katsunuma
Hideyuki Mori
Hiroyuki Nagai
Junpei Okada
Hirohito Katsunuma
Hideyuki Mori