EP0199459A2
Expired / Lapsed
EP
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High toughness ceramic alloys
Assignee: Corning Glass Works
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Filing: 1986-03-19
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Granted: —
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Expires: 2006-03-19
Abstract
Abstract This invention is directed to the production of ceramic alloys consisting essentially of partially stabilized ZrO 2 and/or ZrO 2 -HfO 2 solid solution and/or HfO 2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of YNb0 4 and/or YTaO 4 and/or MNbO 4 and/or MTaO,, wherein M represents Mg +2 , Ca +2 , Sc +3 and/or a rare earth metal ion selected from the group of La +3 , Ce +4 , Ce +3 , Pr +3 , Nd +3 , Sm +3 , Eu +3 , Gd +3 , Tb +3 , DY +3 , HO +3 , Er +3 , Tm +3 , Yb +3 , and Lu +3 substituted for Y, and the use of at least 5 volume percent of such ceramic alloys to toughen hard refractory ceramics.
Inventors
- 👤 Thomas Dale Ketcham
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-27 22:35
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58071; C04B35/01; C04B35/48; C04B35/10; C04B35/111; C04B35/117; C04B35/119; C04B35/16; C04B35/18; C04B35/185; C04B35/44; C04B35/443; C04B35/481; C04B35/486; C04B35/488; C04B35/4885; C04B35/56; C04B35/5607; C04B35/5622; C04B35/622; C04B35/626; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
A ceramic alloy consisting essentially of at least one member of the group of ZrO 2 , partially stablized Zr0 2 , Zr0 2- HfO 2 solid solution, partially stablized Zr0 2 -Hf0 2 solid solution, partially stablized Hf0 2 , and Hf0 2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of a toughening agent selected from the group of YNbO 4 and/or YTaO 4 and/or MNbO 4 and/or MTaO 4 , wherein M represents Mg +2 , Ca +2 , Sc +3 , and/or a rare earth metal ion selected from the group of La +3 , Ce +4 , Ce +3 , Pr +3 , Nd +3 , Sm +3 , EU +3 , Gd +3 , Tb +3 , Dy +3 , HO +3 , Er +3 , Tm +3 , Yb +3 , and Lu +3 which are substituted for Y and two +2 cations being substituted for three +3 Y cations.
Claim 2
Dependent Claim
166 words
A ceramic alloy consisting essentially of at least one member of the group of ZrO 2 , partially stablized Zr0 2 , Zr0 2- HfO 2 solid solution, partially stablized Zr0 2 -Hf0 2 solid solution, partially stablized Hf0 2 , and Hf0 2 exhibiting high toughness through the inclusion of about 0.5-8 mole %, as expressed on the oxide basis, of a toughening agent selected from the group of YNbO 4 and/or YTaO 4 and/or MNbO 4 and/or MTaO 4 , wherein M represents Mg +2 , Ca +2 , Sc +3 , and/or a rare earth metal ion selected from the group of La +3 , Ce +4 , Ce +3 , Pr +3 , Nd +3 , Sm +3 , EU +3 , Gd +3 , Tb +3 , Dy +3 , HO +3 , Er +3 , Tm +3 , Yb +3 , and Lu +3 which are substituted for Y and two +2 cations being substituted for three +3 Y cations.
Claim 3
Dependent Claim
26 words
A ceramic alloy according to claim 1 wherein YO 3/2 is the additive producing the partial stabilization having a composition within polygon O-P-Q-R-S-T-U-V-W-X-Y-Z-O of FIGURE 2.
Claim 4
Dependent Claim
63 words
A ceramic alloy according to claim 2 wherein said toughening agent is selected from the group YNb04 and/or YTa04 consisting essentially, expressed in terms of weight percent on the oxide basis, of about 2.4-12.9% Y 1 0 3 and 0.5-12.0% Nb 2 O 5 +Ta 2 O 5 consisting of 0.5-7.6% Nb 2 O 5 and or 0.85-12.0% Ta 2 O 5 .
Claim 5
Dependent Claim
30 words
A ceramic body of improved toughness consisting essentially of at least 5% by volume of a ceramic alloy according to claim 1 with the remainder being a hard refractory ceramic.
Claim 6
Dependent Claim
51 words
A ceramic body according to claim 4 wherein said hard refractory ceramic consists of at least one member of the group of a-alumina, β-alumina, β"-alumina, Al 2 O 3 -Cr 2 O 3 solid solution, mullite, sialon, nasicon, silicon carbide, silicon nitride, spinel, titanium carbide, titanium diboride, zircon, and zirconium carbide.
Claim 7
Dependent Claim
34 words
A ceramic composite body of improved toughness consisting essentially of up to 80% by volume refractory ceramic fibers and/or whiskers and at least 5% by volume of a ceramic alloy according to claim 1.
Claim 8
Dependent Claim
41 words
A ceramic composite body according to claim 6 wherein said fibers and/or whiskers consist of at least one member of the group of alumina, mullite, sialon, silicon carbide, silicon nitride, AIN, BN, B.C, Zr0 2 , zircon, silicon oxycarbide, and spinel.
Claim 9
Dependent Claim
14 words
A ceramic composite body according to claim 6 also containing a hard refractory ceramic.
Claim 10
Dependent Claim
52 words
A ceramic composite body according to claim 8 wherein said hard refractory ceramic consists of at least one member of the group of a-alumina, β-alumina, β"-alumina, Al 2 O 3 -Cr 2 O 3 solid solutions, mullite, sialon, nasicon, silicon carbide, silicon nitride, spinel, titanium carbide, titanium diboride, zircon, and zirconium carbide.
Claim 11
Dependent Claim
43 words
A ceramic composite body according to claim 9 wherein said fibers and/or whiskers consist of at least one member of the group of alumina, mullite, sialon, silicon carbide, silicon nitride, AIN, BN, B 4 C, ZrO 2 , zircon, silicon oxycarbide, and spinel.
References Cited (Backward Citations)
No citation records indexed.
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