Patent US4495684A successfully refreshed from Google Patents.
US4495684A
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Process of joining a ceramic insert which is adapted to be embedded in a light metal casting for use in internal combustion engines
Assignee: Karl Schmidt GmbH
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Filing: 1982-09-27
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Granted: 1985-01-29
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Expires: 2002-09-27
Abstract
Abstract Ceramic inserts are embedded in thermally highly loaded zones and/or as a heat insulation in light metal castings for use in internal combustion engines. To provide a firm joint between the insert and the light metal, a metallic material which resists creep and/or relaxation is shrunk on the insert before it is embedded.
Inventors
- 👤 Wilfried Sander
- 👤 Siegfried Mielke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:53
CPC Classifications
F; F02; F02F; F02F3/00; F02F3/0015; F02F3/003; C; C04; C04B; C04B35/00; C04B35/01; C04B35/46; C04B35/462; C04B35/478; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0603; F02B23/0636; F02B77/00; F02B77/02; F02F3/10; F02F3/12; F02F3/14; F02F7/00; F02F7/0085; F02F7/0087; F02B2023/0612; F02B3/00; F02B3/06; F05; F05C; F05C2201/00; F05C2201/02; F05C2201/021; F05C2201/04; F05C2201/0433; F05C2201/0448; F05C2251/00; F05C2251/04; F05C2251/042; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S29/00; Y10S29/035; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49249; Y10T29/49252; Y10T29/49256; Y10T29/49258; Y10T29/49826; Y10T29/49863; Y10T29/49865
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
79 words
A process of joining an insert of ceramic material having a thermal conductivity below 10 W/mk, a coefficient of expansion below 10×10 -6 /K and a modulus of elasticity below 7×10 4 N/mm 2 in the combustion chamber recess of a cast light metal piston, comprising shrinking around the insert a ring of metallic material which resists creep and/or relaxation at temperatures up to at least 300° C. and casting said piston body about said ring and insert assemble.
Claim 2
Dependent Claim
79 words
A process of joining an insert of ceramic material having a thermal conductivity below 10 W/mk, a coefficient of expansion below 10×10 -6 /K and a modulus of elasticity below 7×10 4 N/mm 2 in the combustion chamber recess of a cast light metal piston, comprising shrinking around the insert a ring of metallic material which resists creep and/or relaxation at temperatures up to at least 300° C. and casting said piston body about said ring and insert assemble.
Claim 3
Dependent Claim
12 words
A process according to claim 1, wherein said ring comprises ferrous material.
Claim 4
Dependent Claim
18 words
A process according to claim 2, wherein said ring comprises austenitic cast iron having a lamellar graphite structure.
Claim 5
Dependent Claim
12 words
A process according to claim 1, wherein ceramic material comprises aluminium titanate.
Claim 6
Dependent Claim
23 words
A process according to claim 1, wherein said insert and ring are joined to said piston by an intermetallic intermediate layer during casting.
Claim 7
Dependent Claim
42 words
A process according to claim 5, wherein said casting comprises an aluminium alloy, said ring comprises a ferrous material and the insert and ring assembly is heated to 700° C. to 750° C. before the prior to said casting insert is embedded.
References Cited (Backward Citations)
US1790664A
Cited
US1057159A
Cited
US1462655A
Cited
FR570238A
Cited
US1490849A
Cited
FR578316A
Cited
US2063325A
Cited
US2880044A
Cited
US3075817A
Cited
US3402644A
Cited
GB1439328A
Cited
US4169309A
Cited
US4206537A
Cited
DE2919638A1
Cited
JPS572444A
Cited
JPS572445A
Cited
GB2092709A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-29 | 1988-07-30 | 1989-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-29 | 1992-07-30 | 1993-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-29 | 1996-07-30 | 1997-01-29 | $7700.00 | Window Closed / Lapsed |