Sintered alumina-based ceramics and process for producing same

Details Sintered alumina-based ceramics and process for producing same Sintered alumina-based ceramics and process for producing same

1998-06-23

2000-11-07

Marcantoni, Paul

Compositions: ceramic

Ceramic compositions

Refractory

501153, C04B 3510

Patent

active

06143678&

ABSTRACT:
Alumina-based ceramics are thermally stable because of their high melting point and excellent materials in wear resistant properties and chemical stability. However, they contradictly have such a problem that fracture toughness is low, and its improvement is desired. The present invention provides such sintered alumina-based ceramics and their production process that have rendered to grow alumina grains anisotropically and can simultaneously attain high flexural strength and fracture toughness by sintering the formed mixture comprising Al.sub.2 O.sub.3, 0.05-2.5 mol % of VA metal oxide and 0.01-4 mol % SiO.sub.2, relative to Al.sub.2 O.sub.3, respectively.

REFERENCES:
patent: 4892850 (1990-01-01), Hori
patent: 5447894 (1995-09-01), Yasuoka et al.
Journal of the American Ceramic Society, vol. 78, No. 7, "High-Strength and High-Fracture-Toughness Ceramics in the Al.sub.2 O.sub.3 /LaAl.sub.11 O.sub.18 System" by Masaki Yasuoka, Kiyoshi Hirao, Manuel E. Brito, and Shuzo Kanzaki, (1995), pp:1853-56.
"Microstructural Control of Alumina-Based and Silicon Nitride-Based Ceramics--An Approach to the Synergistic Effect of Diverse Properties" by Shuzo Kanzaki, Masaki Yasuoka, Manuel E. Brito, Kiyoshi Hirao and Motohiro Toriyama, National Industrial Research Institute of Nagoya, pp:161-69.
Journal of American Ceramics Society, vol. 79, "Microstructure Development in In Sutu Reinforced Reaction-Bonded Aluminum Niobate-Based Composites" by Daniel E. Garcia, Rolf Janssen and Nils E. Claussen (1996), pp: 2266-70.
J. Am. Ceram.Soc. 75[9]2610-12 (1992), "In Situ" Alumina/Aluminate Platelet Composites by Pei-Lei Chen and I-Wei Chen.
Introduction to Ceramics Kingery et al. p 728-730, 1960.

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