Method of making large cross section injection molded or slip ca

Details Method of making large cross section injection molded or slip ca Method of making large cross section injection molded or slip ca

1990-01-31

1991-07-09

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Including step of generating heat by friction

264 86, 2643282, 501 95, C04B 3332

Patent

active

050303970

ABSTRACT:
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.degree. C. and then in an atmosphere of air at a temperature of 450.degree. C. to 600.degree. C. to completely remove the binder. The resulting binderless shaped article is then heated at 800.degree. 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 theoretical. The resulting article has a complex geometry and a large cross-section but without detrimental cracks.

REFERENCES:
patent: 2939199 (1958-06-01), Strivens
patent: 3234308 (1966-02-01), Hermann
patent: 3882210 (1975-05-01), Crossley et al.
patent: 4144207 (1979-03-01), Ohnsorg
patent: 4248813 (1981-02-01), Hattori
patent: 4283360 (1981-08-01), Henmi
patent: 4460527 (1984-07-01), Kato
patent: 4507224 (1985-03-01), Toibana et al.
patent: 4530875 (1985-07-01), Donomoto
patent: 4533345 (1985-09-01), Wei
patent: 4558016 (1985-12-01), Bronson et al.
patent: 4569886 (1986-02-01), Divecha
patent: 4579699 (1986-04-01), Verzemnieks
patent: 4585500 (1986-04-01), Minjolle et al.
J. A. Mungels, Development of Injection Molded Reaction Bonded Si.sub.3 N.sub.4, Ceramics for High Performance Applications-II, Proc. of 5th Army Mat'l Tech. Confer., Mar. 21-25, 1977, pp. 113-130.
T. J. Whalen, J. E. Noakes and L. L. Terner, Progress on Injection-Molded Reaction-Bonded SiC, Ceramics for High Performance Applications-II, Proc. of 5th Army Mat'l Tech. Confer., Mar. 21-25, 1977, pp. 179-189.
G. D. Schnittgrund, Injection Molded Ceramic Rocket Engine Components, SAMPE, Quarterly, Jul. 1987, p. 873.
C. L. Quachenbush et al., Fabrication of Sinterable Silicon Nitride by Injection Molding, 19th Summary Report, ATD Contractors Coor. Mtg., Oct. 26-29, 1981, pp. 424-437.
G. Bandyopadhyay, Injection Molded Silicon Nitride for Engine Applications: Fabrication and Properties, Proc. of the 21st ATD Contractors Coor. Mtg., Mar. 1984, pp. 315-320.
A. B. Searle, R. W. Grimshaw, The Chemistry and Physics of Clays and other Ceramic Materials, Interscience Pub. Inc. 3rd Ed., pp. 512-513.

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