Compositions: ceramic – Ceramic compositions – Carbide or oxycarbide containing
Patent
1986-05-23
1988-08-30
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Carbide or oxycarbide containing
501 88, 501 89, 501 91, 501 92, 501 95, 501 97, 501103, 501105, C04B 3580, C04B 3510, C04B 3548, C04B 3556
Patent
active
047677279
ABSTRACT:
The present invention provides a fibre-strengthened ceramic formed body with improved mechanical strength, wherein it contains at least 15% by volume of zirconium dioxide, hafnium dioxide or zirconium dioxide/hafnium dioxide composition in the form of monoclinic crystals and an amount of inorganic fibres sufficient for increasing the strength, which is obtainable by hot pressing a mixture of ceramic matrix materials, at least 15% by volume of tetragonal zirconium dioxide, hafnium dioxide or zirconium dioxide/hafnium dioxide composition particles and the fibres at a temperature above the tetragonal.fwdarw.monoclinic transition temperature.
The present invention also provides a process for the production of such a ceramic formed body.
REFERENCES:
patent: 4507224 (1985-03-01), Toibana et al.
patent: 4525464 (1985-06-01), Claussen
Ceramic Engineering and Science Proceedings, Jul.-Aug. 1984, pp. 513-527.
SAE Proceedings of the Twenty-First Automotive Technology Development Conctors' Coordination Meeting p. 138, Mar., 1984, pp. 215-222.
American Ceramic Society Bulletin, Feb. 1985, pp. 298-304.
Claussen Nils
Petzow Gunter
Bell Mark L.
Max-Planck-Gesellschaft zur Foerderung der Wissenschaften e.V.
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