Zirconia based sintered body excellent in durability and...

Details Zirconia based sintered body excellent in durability and... Zirconia based sintered body excellent in durability and...

2005-06-14

2005-06-14

Sample, David (Department: 1755)

Compositions: ceramic

Ceramic compositions

Refractory

C501S152000, C501S153000, C501S154000

Reexamination Certificate

active

06905993

ABSTRACT:
The present invention relates to a zirconia based sintered body excellent in durability, characterized in that in Y2O3-toughened zirconia based sintered body,(a) ZrO2contained therein is mainly composed of tetragonal ZrO2, and the sintered body contains Y2O3as a secondary component and further SiO2and Al2O3as a third component;(b) the sintered body has a molar ratio of Y2O3/ZrO2in the range of 1.5/98.5 to 4/96;(c) the sintered body has a SiO2content of 0.05 to 2.5 wt %;(d) the sintered body has a Al2O3content of 0.05 to 3.0 wt %;(e) the sintered body has an average crystal grain diameter of 0.7 μm or less;(f) SiO2(wt %)×average crystal grain diameter (μm) takes a value ranging from 0.03 to 0.5;(g) the sintered body contains at least one oxide of Na2O, K2O, CaO and Fe2O3as an impurity and a weight ratio of SiO2/(total amount of the impurity) is 5 or more; and(h) the sintered body has a bulk density of 5.70 g/cm3or more; and a part using the sintered body that requires high strength and wear resistance.

REFERENCES:
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patent: 5955392 (1999-09-01), Takeuchi et al.
patent: 6358874 (2002-03-01), Kobayashi et al.
patent: 06072767 (1994-03-01), None
patent: 2001316178 (2001-11-01), None
patent: 2002154873 (2002-05-01), None

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