Plastic and nonmetallic article shaping or treating: processes – Pore forming in situ – Of inorganic materials
Patent
1985-10-09
1987-11-17
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Pore forming in situ
Of inorganic materials
264 42, 501 84, C04B 3800
Patent
active
047073128
ABSTRACT:
Ceramic articles having improved fracture toughness are prepared by ion bombardment of ceramic particles by gas ions to impregnate the particles, cold compacting the gas ion-containing ceramic particles into a form, and hot pressing the gas ion-containing ceramic particle form into a ceramic article whereby gas bubbles are formed in and substantially homogeneously dispersed throughout the ceramic article.
REFERENCES:
patent: 4563432 (1986-01-01), Ehlert
J. T. Neil, "The Big Three in Structural Ceramics", Mechanical Engineering; Mar. 1984; pp. 37-41.
F. F. Lange, "The Interaction of a Crack Front with a Second-Phase Dispersion", Philosophical Magazine; 22; 1970; pp. 983-992.
A. G. Evans, "The Strength of Brittle Materials Containing Second Phase Dispersions", Philosophical Magazine; 26; 1972; pp. 1327-1344.
G. F. Hurley and F. W. Clinard, Jr., "Fracture Toughness and Hardness of Neutron-Irradiated Al.sub.2 O.sub.3, MgAl.sub.2 O.sub.4 and Y.sub.3 Al.sub.5 O.sub.12 ", DOE/ER-0048/1; 1980; pp. 51-57.
L. R. Fleischer, J. A. Spitznagel and W. J. Choyke, "Helium Embrittlement of CTR Materials Simulated by Ion Implantation and Hot Isostatic Pressing of Metal Powders", CONF-750989, vol. II, 1976, pp. 372-286.
M. D. Rechtin, "A Transmission Electron Microscopy Study of the Defect Microstructure of Al.sub.2 O.sub.3 Subjected to Ion Bombardment", Rad. Eff. vol. 42; 1979; pp. 129-144.
Derrington James
Fuerle R. D.
Westinghouse Electric Corp.
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