TITLE: METHOD OF MAKING LARGE CROSS-SECTION INJECTION MOLDED OR SLIP CAST
CERAMICS SHAPES.
European Patent Application EP0515574 A1

ABSTRACT:
Abstract not available for EP0515574
Abstract of corresponding document: WO9111407
A method of producing crack free ceramic parts having large
cross-sections is disclosed. An initial mixture of ceramic powder
containing a binder and from 0.1 v/o to 10 v/o of whiskers or fibers
which are made of carbon, graphite or high temperature melting or
decomposition point organic polymers. The mixture is either injection
molded or slip cast to form a shaped article. The shaped article is
heated in a nitrogen atmosphere to a temperature of 450 DEG C and then
in an atmosphere of air at a temperature of 450 DEG C to 600 DEG C to
completely remove the binder. The resulting binderless shaped article
is then heated at 800 DEG C for a period of time sufficient to
completely remove the whiskers or fibers from the shaped articles. The
article is then encapsulated in glass and hot isostatically pressed at
a pressure of 30,000 psi to densify the article to approximately 99 %
of theoritical. The resulting article has a complex geometry and a
large cross-section but without detrimental cracks.

INVENTORS:
Bandyopadhyay, Gautam (US)
Lieberman, Sheldon (US)
French, Kenneth (US)

APPLICATION NUMBER: EP19910906871
PUBLICATION DATE: 12/02/1992
FILING DATE: 01/24/1991

ASSIGNEE: GTE LABORATORIES INC (US)
INTERNATIONAL CLASSES: B28B1/24; C04B33/28; C04B35/593; C04B35/622; C04B35/638; C04B35/645;
C04B35/71; (IPC1-7): C04B33/28; C04B35/71
EUROPEAN CLASSES: C04B35/593; C04B35/645H

OTHER REFERENCES:
No further relevant documents disclosed
See also references of WO 9111407A1