METHOD FOR PRODUCING A MULTIPART CONSTRUCTION AND SUCH A CONSTRUCTION

• US 20100062396A1
• Filed: 12/21/2007
• Published: 03/11/2010
• Est. Priority Date: 12/27/2006
• Status: Active Grant

• Current Assignee: Degudent GmbH
• Original Assignee: Degudent GmbH
• Inventors: Hock, Elmar, Volkl, Lothar, Fecher, Stefan
• Granted Patent: US 8,501,082 B2
• Time in Patent Office: Days
• US Class Current: 433/201.100
• CPC Class Codes: A61C 13/0003 Making bridge-work, inlays, implants or the like
• CPC Class Codes: A61C 8/0012 characterised by the material or composition, e.g. ceramics, surface layer, metal alloy use of specific materials A61K6/00
• CPC Class Codes: A61C 8/005 Connecting devices for joining an upper structure with an implant member, e.g. spacers
• CPC Class Codes: A61C 8/0054 having a cylindrical implant connecting part
• CPC Class Codes: A61C 8/0068 with an additional screw
• CPC Class Codes: C04B 2235/3217 Aluminum oxide or oxide forming salts thereof, e.g. bauxite, alpha-alumina
• CPC Class Codes: C04B 2235/3224 Rare earth oxide or oxide forming salts thereof, e.g. scandium oxide
• CPC Class Codes: C04B 2235/3225 Yttrium oxide or oxide-forming salts thereof
• CPC Class Codes: C04B 2235/3272 Iron oxides or oxide forming salts thereof, e.g. hematite, magnetite
• CPC Class Codes: C04B 2235/3284 Zinc oxides, zincates, cadmium oxides, cadmiates, mercury oxides, mercurates or oxide forming salts thereof
• CPC Class Codes: C04B 2235/3286 Gallium oxides, gallates, indium oxides, indates, thallium oxides, thallates or oxide forming salts thereof, e.g. zinc gallate
• CPC Class Codes: C04B 2235/3287 Germanium oxides, germanates or oxide forming salts thereof, e.g. copper germanate
• CPC Class Codes: C04B 2235/3296 Lead oxides, plumbates or oxide forming salts thereof, e.g. silver plumbate
• CPC Class Codes: C04B 2235/602 Making the green bodies or pre-forms by moulding
• CPC Class Codes: C04B 2235/612 Machining
• CPC Class Codes: C04B 2235/94 Products characterised by their shape
• CPC Class Codes: C04B 2235/945 Products containing grooves, cuts, recesses or protusions
• CPC Class Codes: C04B 2235/9615 Linear firing shrinkage
• CPC Class Codes: C04B 2235/9638 Tolerance; Dimensional accuracy
• CPC Class Codes: C04B 2237/348 Zirconia, hafnia, zirconates or hafnates
• CPC Class Codes: C04B 2237/76 : Forming laminates or joined articles comprising at least one member in the form other than a sheet or disc, e.g. two tubes or a tube and a sheet or disc
• CPC Class Codes: C04B 2237/84 : Joining of a first substrate with a second substrate at least partially inside the first substrate, where the bonding area is at the inside of the first substrate, e.g. one tube inside another tube
• CPC Class Codes: C04B 35/111 : Fine ceramics
• CPC Class Codes: C04B 35/46 : based on titanium oxides or titanates containing also zirconium or hafnium oxides, zirconates or hafnates C04B35/49
• CPC Class Codes: C04B 35/4682 : based on BaTiO3 perovskite phase
• CPC Class Codes: C04B 35/486 : Fine ceramics
• CPC Class Codes: C04B 35/505 : based on yttrium oxide
• CPC Class Codes: C04B 35/64 : Burning or sintering processes C04B33/32 takes precedence ; powder metallurgy B22F
• CPC Class Codes: C04B 37/001 : directly with other burned ceramic articles

Abstract

A method for manufacturing a multipart assembly of sintered oxide ceramic material, including one first component which at least partially surrounds one second component in such a manner that detaching the first component from the second component is not possible without destroying the first and/or second component. The assembly is produced by producing a single-part first shaped part and a single-part second shaped part from an oxide ceramic blank, whereby the first shaped part and the second shaped part are enlarged to compensate for the shrinkage during sintering, and assembling the sintered shaped part as second component with the first shaped part and subsequently sintering them together. As the first shaped part is employed a shaped part with an opening whose effective cross section after sintering is either smaller than the effective cross section of the second shaped part after sintering in a region that extends within the first component, or is smaller that the effective cross section of the second component in front of and behind the opening.

Claims

1. A method for manufacturing a multipart assembly of sintered oxide ceramic material, such as partially stabilized zirconia, comprising one first component (10, 22, 30, 144), which at least partially surrounds one second component (12, 26, 32, 141), such that detaching the first component from the second component is impossible without destroying the first and/or second component, comprising the steps of:

producing a single-part first shaped part (110, 122, 130, 44) and a single-part second shaped part (112, 126, 132, 41) from an oxide ceramic blank, whereby the first shaped part and the second shaped part are enlarged—

relative to the first component (10, 22, 30, 144) and the second component (12, 26, 32, 141)—

by a scaling factor that compensates for shrinkage during sintering,

completely sintering the second shaped part to produce the second component, and

assembling the second component with the first shaped part and subsequently sintering them together,

wherein as the first shaped part (110, 122, 130, 44) one employs a shaped part with an opening, whose effective cross section after sintering is either smaller than the effective cross section of the second shaped part after sintering in a region that extends within the first component, or is smaller that the effective cross section of the second component in front of and behind the opening.

3. The method of claim 1, characterized in that as blank one employs a green blank of pressed oxide ceramic powder.

4. The method of claim 1, characterized in that oxide ceramic powder is pressed by axial or isostatic pressing at a pressure p with 150 MPa≦

p≦

350 MPa.

5. The method of claim 1, characterized in that as a blank one employs a presintered blank of pressed oxide ceramic powder material.

6. The method of claim 1, characterized in that the green blank is presintered at a temperature T₁ with T₁≧

450°

C., in particular 600°

C.≦

T1≦

1200°

C. for a duration t₁ with 0.5 h≦

t1≦

6 h.

7. The method of claim 1, characterized in that the presintered blank is dense-sintered at a temperature T₂ with 300°

C.≦

T₂≦

650°

C. for a duration t₂ with 1 h≦

t₂≦

3 h.

8. The method of claim 1, characterized in that as oxide ceramic powder one employs at least one metal oxide powder from the group of Al₂O₃, TiO₂, MgO, Y₂O₃, BaTiO₃, zirconia, zirconia mixed crystal powder.

9. The method of claim 1, characterized in that the zirconia mixed crystal powder employed consists of:

90-98% by weight 

zirconia 0-4% by weight hafnium oxide 1-7% by weight yttrium oxide 0-1% by weight one of the oxides of the elements aluminum, gallium, germanium, zinc, lead, the lanthanides 0-2% by weight oxidation-dyeing additives,

whereby preferable dyeing additives are;

Er₂O₃, Pr₆O₁₁, or Fe₂O₃.

10. The method of claim 1, characterized in that the blank is dense-sintered to 90% to 100%, in particular 96% to 100% of the theoretical density.

11. An assembly fabricated in accordance with claim 1, characterized in that the first component is a casing (10) with an opening (14) through which passes as the second component a plunger rod (12), which possesses a plunger (16), which has an effective cross-section that is greater than that of the opening and is movable back and forth within the casing.

12. An assembly fabricated in accordance with Claim 1, characterized in that, a preferably flanged shaft constitutes the second component (141) and that a section of the shaft is surrounded by a pierced disk (144), whereby this section possesses relative to the shaft axis an offset that has—

or the shaft possesses sections (146, 148) that have—

effective dimensions that are greater than the opening of the dense-sintered disk, through which the shaft passes.

13. An assembly fabricated in accordance with claim 1, characterized in that the assembly is a dental implant (30), with an implant component carrying a dental structure constituting the first component, with an opening (34) through which passes a bolt (32) as the second component, whereby the bolt possesses widened ends, such as heads (38, 40), with respective cross-sections that are greater than the effective cross-section of the opening.

14. An assembly fabricated in accordance with claim 1, characterized in that the assembly is a joint socket (22) with a seat (24) accessible via an opening constituting the first component, whereby as the second component the ball (20) of a joint (26) is inserted into the seat (24), whose opening cross-section is smaller than the maximum cross-section of the joint ball (20).

2. (canceled)