US3887387A
Expired / Lapsed
US
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Shaped zirconium oxide bodies of high strength
Assignee: Feldmuehle Anlagen und Produktion GmbH
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Filing: 1974-02-11
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Granted: 1975-06-03
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Expires: 1994-02-11
Abstract
Abstract Shaped bodies of zirconium oxide of high mechanical strength can be prepared by sintering a pulverulent mixture of 30% to 90% monoclinic zirconium oxide, 7.8% to 69.5% zirconium oxide conventionally stabilized by bound oxides of metals having an ionic radius similar to that of zirconium, and 0.5% to 2.2% magnesium oxide and/or calcium oxide at above 1,600*C, the combined amount of the stabilizing oxide and of the magnesium and/or calcium oxide in the sintered body being 2.5% to 3.5%.
Inventors
- 👤 Hans Sturhahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:22
CPC Classifications
B; B23; B23P; B23P15/00; B23P15/28; C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/486; F; F02; F02B; F02B55/00; F02B55/08
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
73 words
A SHAPED BODY ESSENTIALLY CONSISTING OF SINTERED POLYCRYSTALLINE ZIRCONIUM OXIDE AND 2.5% OF AT LEAST ONE OXIDE OF THE GROUP CONSISTING OF OXIDES OF MAGNESIUM, CALCIUM, RATE EARTH METAL, CADMIUM, MANGANESE, COBALT, AND TITANIUM, 75% TO 95% OF SAIDBODY CONSISTING OF CUBIC CRYSTALS, SAID BODY HAVING A DENSITY GREATER THAN 5.5 G/CM3, AND THE MATERIAL OF SAID BODY HAVING A FLEXURAL STRENGTH OF AT LEAST 30 KP/MM2, ALL PERCENT VALUES BEING BY WEIGHT.
Claim 2
Dependent Claim
73 words
A SHAPED BODY ESSENTIALLY CONSISTING OF SINTERED POLYCRYSTALLINE ZIRCONIUM OXIDE AND 2.5% OF AT LEAST ONE OXIDE OF THE GROUP CONSISTING OF OXIDES OF MAGNESIUM, CALCIUM, RATE EARTH METAL, CADMIUM, MANGANESE, COBALT, AND TITANIUM, 75% TO 95% OF SAIDBODY CONSISTING OF CUBIC CRYSTALS, SAID BODY HAVING A DENSITY GREATER THAN 5.5 G/CM3, AND THE MATERIAL OF SAID BODY HAVING A FLEXURAL STRENGTH OF AT LEAST 30 KP/MM2, ALL PERCENT VALUES BEING BY WEIGHT.
Claim 3
Dependent Claim
76 words
A shaped body essentially consisting of sintered polycrystalline zirconium oxide and 2.5% to 3.5% of at least one oxide of the group consisting of oxides of magnesium, calcium, rare earth metal, cadmium, manganese, cobalt, and titanium, 75% to 95% of said body consisting of cubic crystals, said body having a density greater than 5.5 g/cm3, and the material of said body having a flexural strength of at least 30 kp/mm2, all percent values being by weight.
Claim 4
Dependent Claim
76 words
A shaped body essentially consisting of sintered polycrystalline zirconium oxide and 2.5% to 3.5% of at least one oxide of the group consisting of oxides of magnesium, calcium, rare earth metal, cadmium, manganese, cobalt, and titanium, 75% to 95% of said body consisting of cubic crystals, said body having a density greater than 5.5 g/cm3, and the material of said body having a flexural strength of at least 30 kp/mm2, all percent values being by weight.
Claim 5
Dependent Claim
27 words
said amount being sufficient to make the combined weight of magnesium oxide and calcium oxide in said body 2.7% to 3.3% of the weight of said body,
Claim 6
Dependent Claim
27 words
said amount being sufficient to make the combined weight of magnesium oxide and calcium oxide in said body 2.7% to 3.3% of the weight of said body,
Claim 7
Dependent Claim
7 words
30% to 90% pulverulent, monoclinic zirconium oxide,
Claim 8
Dependent Claim
7 words
30% to 90% pulverulent, monoclinic zirconium oxide,
Claim 9
Dependent Claim
33 words
7.8% to 69.5% pulverulent zirconium oxide stabilized by an amount of a stabilizing oxide selected from the group consistinG of magnesium oxide and calcium oxide and bound to said stabilized zirconium oxide, and
Claim 10
Dependent Claim
33 words
7.8% to 69.5% pulverulent zirconium oxide stabilized by an amount of a stabilizing oxide selected from the group consistinG of magnesium oxide and calcium oxide and bound to said stabilized zirconium oxide, and
Claim 11
Dependent Claim
6 words
all percent values being by weight.
Claim 12
Dependent Claim
6 words
all percent values being by weight.
Claim 13
Dependent Claim
29 words
A body as set forth in claim 1, said body containing at least 2.7% of at least one member of the group consisting of magnesium oxide and calcium oxide.
Claim 14
Dependent Claim
30 words
A body as set forth in claim 1, wherein said oxide in magnesium oxide, the amount of said oxide being 2.5% to 3.0%, said strength being at least 45 kp/mm2.
Claim 15
Dependent Claim
48 words
0.5% to 2.2% of a pulverulent member selected from the group consisting of magnesium oxide and calcium oxide; b. shaping said mixture under applied pressure into a green compact; and c. heating said compact at a temperature about 1,600*C until said compact is sintered to a shaped body,
Claim 16
Dependent Claim
48 words
0.5% to 2.2% of a pulverulent member selected from the group consisting of magnesium oxide and calcium oxide; b. shaping said mixture under applied pressure into a green compact; and c. heating said compact at a temperature about 1,600*C until said compact is sintered to a shaped body,
Claim 17
Dependent Claim
23 words
A body as set forth in claim 3, wherein said amount is 2.6% to 2.85%, and said strength is greater than 55 kp/mm2.
Claim 18
Dependent Claim
16 words
A body as set forth in claim 4, wherein said density is greater than 5.6 g/cm3.
Claim 19
Dependent Claim
39 words
A body as set forth in claim 1, wherein the oxides of said group are magnesium oxide and calcium oxide in a weight ratio between 1:2 and 2:1, the shear strength of said material being greater than 55 kp/mm2.
Claim 20
Dependent Claim
30 words
A body as set forth in claim 6, wherein said crystals have a grain size greater than 35 m Mu , said body having a density greater than 5.55 g/cm3.
Claim 21
Dependent Claim
11 words
A body as set forth in claim 6, which is annular.
Claim 22
Dependent Claim
11 words
A body as set forth in claim 6, which is plate-shaped.
Claim 23
Independent Claim
12 words
A method of preparing a shaped body which comprises: a. intimately mixing
Claim 24
Independent Claim
12 words
A method of preparing a shaped body which comprises: a. intimately mixing
Claim 25
Dependent Claim
22 words
A method as set forth in claim 10, wherein said stabilizing oxide is calcium oxide, and said pulverulent member is magnesium oxide.
Claim 26
Dependent Claim
18 words
A method as set forth in claim 10, wherein said monoclinic zirconium oxide contains more than 99% ZrO2.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |