Method of superplastically deforming zirconia materials
First Claim
Patent Images
1. A method for superplastically deforming an yttria-stabilized tetragonal zirconia-based ceramic material, said method comprising the steps of:
- (a) providing an yttria-stabilized zirconia-based ceramic-base material including about 1.5 to about 6 mole percent of yttria;
(b) doping said yttria-stabilized zirconia-based ceramic material with about 0.1 to about 2 mole percent, of the total composition, of a compound containing an element selected from the group consisting of Mn, Fe, Co, Ni, Cu, Nz, and mixtures thereof to form a doped zirconia-based ceramic-base material, the amount of said compound being sufficient to permit superplastic deformation to occur at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec, and a temperature below about 1250°
C.;
(c) milling said doped zirconia-based ceramic-base material for a predetermined amount of time;
(d) pressure slip casting said doped zirconia-based ceramic material;
(e) isostatically pressing said doped zirconia-based ceramic material to a density of about 50 to about 65%;
(f) sintering said doped zirconia-based ceramic material at a temperature in the range of about 1000°
C. to about 1300°
C. to achieve a density of about 90% to about 100% of the theoretical density; and
(g) superplastically deforming said doped zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec, and a temperature below about 1250°
C.
0 Assignments
0 Petitions
Accused Products
Abstract
A method for deforming a ceramic compound by doping a zirconia ceramic material with an effective amount of a transition metal and superplastically deforming the material.
39 Citations
13 Claims
-
1. A method for superplastically deforming an yttria-stabilized tetragonal zirconia-based ceramic material, said method comprising the steps of:
-
(a) providing an yttria-stabilized zirconia-based ceramic-base material including about 1.5 to about 6 mole percent of yttria; (b) doping said yttria-stabilized zirconia-based ceramic material with about 0.1 to about 2 mole percent, of the total composition, of a compound containing an element selected from the group consisting of Mn, Fe, Co, Ni, Cu, Nz, and mixtures thereof to form a doped zirconia-based ceramic-base material, the amount of said compound being sufficient to permit superplastic deformation to occur at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec, and a temperature below about 1250°
C.;(c) milling said doped zirconia-based ceramic-base material for a predetermined amount of time; (d) pressure slip casting said doped zirconia-based ceramic material; (e) isostatically pressing said doped zirconia-based ceramic material to a density of about 50 to about 65%; (f) sintering said doped zirconia-based ceramic material at a temperature in the range of about 1000°
C. to about 1300°
C. to achieve a density of about 90% to about 100% of the theoretical density; and(g) superplastically deforming said doped zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec, and a temperature below about 1250°
C. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. A method for superplastically deforming a ceramic material, said method comprising the steps of:
-
(a) preparing a densified tetragonal zirconia ceramic-base material doped with a cooper compound in an amount of about 0.1 to about 2 mole percent, of the total composition; and (b) superplastically deforming said doped tetragonal zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec and a temperature below about 1250°
C.
-
-
8. A method for superplastically deforming a ceramic material, said method comprising the steps of:
-
(a) preparing a densified tetragonal zirconia ceramic-base material doped with a zinc compound in an amount of about 0.1 to about 2 mole percent, of the total composition; and (b) superplastically deforming said doped tetragonal zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec and a temperature below about 1250°
C.
-
-
9. A method for superplastically deforming a ceramic material, said method comprising the steps of:
-
(a) preparing a densified tetragonal zirconia ceramic-base material doped with a cobalt compound in an amount of about 0.1 to about 2 mole percent, of the total composition; and (b) superplastically deforming said doped tetragonal zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec and a temperature below about 1250°
C.
-
-
10. A method for superplastically deforming a ceramic material, said method comprising the steps of:
-
(a) preparing a densified tetragonal zirconia ceramic-base material doped with a Iron compound in an amount about 0.1 about 2 mole percent, of the total composition; and (b) superplasticaly deforming said doped tetragonal zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10.sup.-3 /sec and a temperature below about 1250°
C.
-
-
11. A method for superplastically deforming a ceramic material, said method comprising the steps of;
-
(a) preparing a densified tetragonal zirconia ceramic-base material doped with a nickel compound in an amount of about 0.1 to about 2 mole percent of the total composition; and (b) superplastically deforming said doped tetragonal zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec and a temperature below about 1250°
C.
-
-
12. A method for superplastically deforming a ceramic material, said method comprising the steps of:
-
(a) preparing a densified tetragonal zirconia ceramic-base material doped with a manganese compound in an amount of about 0.1 to about 2 mole percent, of the total composition; and (b) superplastically deforming said doped tetragonal zirconia-based ceramic material at a flow stress of about 10 MPa to about 30 MPa, a strain rate of about 3×
10-4 /sec to about 3×
10-3 /sec and a temperature below about 1250°
C. - View Dependent Claims (13)
-
Specification
-
- Resources
Litigation Campaign Assessment
Thank you for your request. You will receive a custom alert email when the Litigation Campaign Assessment is available.
×
-
Current AssigneeBoard of Regents of the University of Michigan (University of Michigan)
-
Original AssigneeBoard of Regents of the University of Michigan (University of Michigan)
-
InventorsChen, I-Wei, Hwang, Chinmau J.
-
Primary Examiner(s)DERRINGTON, JAMES H
-
Application NumberUS07/779,130Time in Patent Office244 DaysField of Search264/60, 264/65, 264/325, 264/332US Class Current264/651CPC Class CodesC04B 35/486 Fine ceramicsC04B 35/622 Forming processes; Processi...
