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Title: Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases

Abstract

A reaction injection molding process is described for preparing a sintered, silicon nitride-containing ceramic article comprising; (1) injecting into a heated mold a fluid, nondilatant mixture comprising (a) at least 40% by volume of a powder mixture of (i) from about 20 wt.% to about 98 wt.% silicon nitride, (ii) from about 0.5 wt.% to about 20 wt.% of a silicate glass-forming sintering aid, and (iii) from about 0.001 wt.% to about 80 wt.% of a high metal content transition metal silicide or a transition metal or metal compound that forms a high metal content silicide with silicon nitride under the conditions defined in steps (2) or (3), and (b) a curable silicon nitride precursor binder that is a liquid below its curing temperature, to cure the binder and produce a hardened molded article, (2) heating the hardened mol suitable atmosphere to a temperature sufficient to convert the cured binder to a silicon nitride-containing ceramic, and (3) sintering the article by (i) heating at a temperature of 1,300 to 1,800 C until a silicate glass forms, and (ii) further heating at a temperature of 1,300 to 1,800 C under a vacuum until oxygen is removed from the silicate glass andmore » the glass crystallizes.« less

Inventors:
;
Publication Date:
OSTI Identifier:
5987334
Patent Number(s):
US 5240658; A
Application Number:
PPN: US 7-851038
Assignee:
IMS; EDB-93-135155
Resource Type:
Patent
Resource Relation:
Patent File Date: 10 Mar 1992
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; SILICON NITRIDES; MOLDING; BINDERS; CERAMICS; FLUIDS; GLASS; HEATING; MIXTURES; POWDERS; SILICIDES; SINTERING; DISPERSIONS; FABRICATION; NITRIDES; NITROGEN COMPOUNDS; PNICTIDES; SILICON COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication

Citation Formats

Lukacs, A III, and Matsumoto, R L.K. Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases. United States: N. p., 1993. Web.
Lukacs, A III, & Matsumoto, R L.K. Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases. United States.
Lukacs, A III, and Matsumoto, R L.K. 1993. "Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases". United States.
@article{osti_5987334,
title = {Reaction injection molding of silicon nitride ceramics having crystallized grain boundary phases},
author = {Lukacs, A III and Matsumoto, R L.K.},
abstractNote = {A reaction injection molding process is described for preparing a sintered, silicon nitride-containing ceramic article comprising; (1) injecting into a heated mold a fluid, nondilatant mixture comprising (a) at least 40% by volume of a powder mixture of (i) from about 20 wt.% to about 98 wt.% silicon nitride, (ii) from about 0.5 wt.% to about 20 wt.% of a silicate glass-forming sintering aid, and (iii) from about 0.001 wt.% to about 80 wt.% of a high metal content transition metal silicide or a transition metal or metal compound that forms a high metal content silicide with silicon nitride under the conditions defined in steps (2) or (3), and (b) a curable silicon nitride precursor binder that is a liquid below its curing temperature, to cure the binder and produce a hardened molded article, (2) heating the hardened mol suitable atmosphere to a temperature sufficient to convert the cured binder to a silicon nitride-containing ceramic, and (3) sintering the article by (i) heating at a temperature of 1,300 to 1,800 C until a silicate glass forms, and (ii) further heating at a temperature of 1,300 to 1,800 C under a vacuum until oxygen is removed from the silicate glass and the glass crystallizes.},
doi = {},
url = {https://www.osti.gov/biblio/5987334}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Tue Aug 31 00:00:00 EDT 1993},
month = {Tue Aug 31 00:00:00 EDT 1993}
}