Zirconia based sintered body excellent in durability and wear resistant parts using the same
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United States of America Patent
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Jun 14, 2005
Grant Date -
Aug 19, 2004
app pub date -
Aug 2, 2002
filing date -
Oct 18, 2001
priority date (Note) -
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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) ZrO2 contained therein is mainly composed of tetragonal ZrO2, and the sintered body contains Y2O3 as a secondary component and further SiO2 and Al2O3 as a third component; (b) the sintered body has a molar ratio of Y2O3/ZrO2 in the range of 1.5/98.5 to 4/96; (c) the sintered body has a SiO2 content of 0.05 to 2.5 wt %; (d) the sintered body has a Al2O3 content 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 Fe2O3 as 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/cm3 or more; and a part using the sintered body that requires high strength and wear resistance.
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