Method for improving the toughness of silicon carbide-based cera

Details Method for improving the toughness of silicon carbide-based cera Method for improving the toughness of silicon carbide-based cera

1993-12-14

1996-12-03

Derrington, James

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

501 89, C04B 35575

Patent

active

055805108

ABSTRACT:
Method of improving the toughness of SiC-based ceramics. SiC, , AlN, Al.sub.2 O.sub.3 and optionally .alpha.-Si.sub.3 N.sub.4 are hot pressed to form a material which includes AlN polytypoids within its structure.

REFERENCES:
patent: 4826791 (1989-05-01), Mehrotra
patent: 4935389 (1990-06-01), Umebayashi
"Contribution to the Phase Diagram Si.sub.3 N.sub.4 -AIN-Al.sub.2 O.sub.3 -SiO.sub.2, " by L. J. Gauckler, H. L. Lukas and G. Petzow, J.Am.Ceram.Soc., 58 [7]346-347 (1975).
"The Structural Characterization of SiAION Polytypoids" by D. P. Thompson, P. Korgul and A. Hendry in Progress in Nitrogen Ceramics (Edited by F. L. Riley) NATO ASI Series, Series E: Applied Sciences -No. 65, pp. 61-74 (1983).
"Role of Al.sub.2 O.sub.3 and SiO.sub.2 Additions in Sintering of AIN," by K. Komeya, H. Inoue and A. Tsuge, J.Am.Ceram.Soc.,57 [9] 411-412 (1974).
"Sintering of Aluminum Nitride with Low Oxide Addition" by K. A. Schwetz, H. Knoch and A. Lipp, in Progress in Nitrogen Ceramics (Edited by F. L. Riley), NATO ASI Series. Series E: Applied Sciences-No. 65, pp. 245-252, 1983.
"Fabrication and Characterization of Silicon Carbide Alloys: The Silicon Carbide-Aluminum Nitride System," by Rafaniello, W., Doctoral Dissertation, The University of Utah, (1984).
"High Temperature Reactions and Microstructures in the Al.sub.2 O.sub.3 -AIN System," by J. W. McCauley and N. D. Corbin, NATO ASI Series. Series E: Applied Sciences-No. 65, pp. 111-118, 1983.
"Evolution of Mircostructure in Polycrystalline Silicon Carbide," by S. Shinozaki and K. R. Kinsman, Proceedings of Crystalline Ceramics; Edited by Hayne Palmer III, R. F. Davis, and T. M. Hare, p.641 (1978).
"Composition and Properties of Hot-Pressed SiC-AIN Solid Solutions," by R. Ruh and A. Zangvil, J.Am.Ceram.Soc., 65 [5] 260-265 (1982).
"A Critical Evaluation of Indentation Techniques for Measuring Fracture Toughness: I. Direct Crack Measurements," G. R. Anstis Chantikul, B. R. Lawn and D. B. Marshall, J. Am-Ceram Soc., 64 [9] 533-543 (1981).
"Fabrication and Characterization of SiC-AIN Alloys," by W. Rafaniello, K. Cho, and A. V. Virkar, J. Mat'ls. Sci., 16 (1981) 3479-3488.
"Investigation of Phase Stability in the System SiC-AIN," by W. Rafaniello, M. R. Plichta, and A. V. Virkar, J.Am.Ceram.Soc., 66 [4] 272-276 (Apr., 1983).
"Fabrication, Microstructure, and Properties of SiC-AIN Ceramic Alloys," by R. R. Lee, and W. C. Wei, Ceram, Eng. Sci. Proc. 11[7-8] pp. 1094-1121 (1990) (addresses in-situ reinforced SiC-AIN ceramic alloys).
"Improvements in Mechanical Properties in SiC by the Addition of Ti C Particles," by G. C. Wei and P. F. Becher, J.Am.Ceram.Soc., 67[8] 571-574) (Aug., 1984).
"Fabrication of Si.sub.3 N.sub.4 /SiC Composites by Transient Liquid Phase Sintering" by S. D. Nunn and T. Y. Tien, Ceramic Technology for Advanced Heat Engines Project Semiannual Progress Report for Apr. 1990 Through Sep. 1990, pp. 153-157.
"Fabrication of SiC-AIN Composites," by G. E. Hilmas and T. Y. Tien, Ceramic Technology for Advanced Heat Engines Project Semiannual Progress Report for Apr. 1990 Through Sep. 1990, pp. 158-167.

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