Title:
REFRACTORY FOR CASTING RARE EARTH ALLOY AND METHOD FOR PRODUCING THE SAME AND METHOD FOR CASTING RARE EARTH ALLOY
Document Type and Number:
WIPO Patent Application WO/1999/067187
Kind Code:
A1
Abstract:
In casting a rare earth alloy into a sheet (6) using a tundish (3, 13), as a refractory for a tundish which can be used for dispensing with a preheating step for the purpose of improving the flow of a melt (2), use is made of a refractory which consists substantially of 70 wt.% or more of Al¿2?O¿3? and 30 % or less of SiO¿2? or consists substantially of 70 wt.% or more of ZrO¿2? and 30 % or less of one or more of Y¿2?O¿3?, Ce¿2?O¿3?, CaO, MgO, Al¿2?O¿3?, TiO¿2? and SiO¿2?, and has a bulk density of 1 g/cm?3¿, a thermal conductivity in a temperature range of 1200 to 1400 °C of 0.5 kcal/(mh °C) or less, and a heat loss under a heating condition of one hour at 1400 °C of 0.5 wt.% or less.
Inventors:
HASEGAWA HIROSHI (JP)
KAWAMURA NOBUHIKO (JP)
SASAKI SHIRO (JP)
HIROSE YOICHI (JP)
KAWAMURA NOBUHIKO (JP)
SASAKI SHIRO (JP)
HIROSE YOICHI (JP)
Application Number:
PCT/JP1999/003299
Publication Date:
December 29, 1999
Filing Date:
June 22, 1999
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
HASEGAWA HIROSHI (JP)
KAWAMURA NOBUHIKO (JP)
SASAKI SHIRO (JP)
HIROSE YOICHI (JP)
HASEGAWA HIROSHI (JP)
KAWAMURA NOBUHIKO (JP)
SASAKI SHIRO (JP)
HIROSE YOICHI (JP)
International Classes:
B22D13/10; B22D41/02; C04B35/10; C04B35/117; C04B35/48; C04B35/488; C04B35/66; C04B35/80; (IPC1-7): C04B35/10; C04B35/48; B22D11/10; B22D13/10; B22D41/02
Foreign References:
| JPH0569097A | 1993-03-23 | |||
| JPH07256436A | 1995-10-09 | |||
| JPH07237978A | 1995-09-12 | |||
| JPH09180716A | 1997-07-11 | |||
| JPH0931609A | 1997-02-04 | |||
| JPH05320792A | 1993-12-03 |
Other References:
See also references of EP 1118601A4
Attorney, Agent or Firm:
Murai, Takuo (Hongo 2-chome Bunkyo-ku Tokyo, JP)
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