Compositions: ceramic – Ceramic compositions – Refractory
Patent
1984-07-11
1986-12-02
Bell, Mark L.
Compositions: ceramic
Ceramic compositions
Refractory
501105, C04B 3548, C04B 3510
Patent
active
046265180
ABSTRACT:
A method for manufacture of a high toughness sintered body, characterized by sintering a shaped body of a mixed powder consisting essentially of from 40 to 70% by weight of a first component of powdered ZrO.sub.2 containing at least one stabilizer selected from the group consisting of Y.sub.2 O.sub.3, CaO, and MgO and having an average particle diameter of not more than 1.mu. and from 30 to 60% by weight of a second component of powdered .alpha.-Al.sub.2 O.sub.3 having an average particle diameter of not more than 1 .mu.m, which mixed powder may also contain not more than 3% by weight of SiO.sub.2, not more than 0.5% by weight of Fe.sub.2 O.sub.3, or not more than 0.5% by weight of TiO.sub.2 in a combined proportion of not more than 3% by weight at a temperature in the range of from 1400.degree. C. to 1600.degree. C. under normal pressure thereby producing a sintered body wherein at least 90% by weight of ZrO.sub.2 particles present therein are accounted for by tetragonal and cubic crystals, the ratio of said tetragonal crystals to said cubic crystals is at least 1:3, and the average crystal particle diameter of the entire sintered body is at least 3.mu..
REFERENCES:
patent: 4218253 (1980-08-01), Dworak et al.
patent: 4221650 (1980-09-01), Friese et al.
patent: 4316964 (1982-02-01), Lange
patent: 4360598 (1982-11-01), Otagiri et al.
Reed et al.; Ceramic Bulletin, vol. 55, p. 717 (1976).
Iio Satoshi
Matsuo Yasushi
Watanabe Masakazu
Bell Mark L.
NGK Spark Plug Co. Ltd.
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