US4526824A
Expired / Lapsed
US
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Thermal insulation lining of ceramic material for a hot gas duct enveloped in metal
Assignee: Feldmuehle AG
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Filing: 1984-03-07
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Granted: 1985-07-02
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Expires: 2004-03-07
Abstract
Abstract A thermal insulation lining (1) in the exhaust duct (4) of a cylinder head (5) consists of a sintered compact (2) of ceramic material having an envelope containing or consisting of inorganic fibers.
Inventors
- 👤 Ulf Dworak
- 👤 Hans Olapinski
- 👤 Dieter Fingerle
- 👤 Ulrich Krohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:09
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/02; F02B77/11; F05; F05C; F05C2203/00; F05C2203/08; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1314; Y10T428/1328; Y10T428/1331; Y10T428/249921; Y10T428/249924; Y10T428/249928; Y10T428/25; Y10T428/256; Y10T428/257; Y10T428/26
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
In a thermal insulation lining of ceramic material for a hot gas duct enveloped in cast metal, especially in the cylinder head of an internal combustion engine, the improvement wherein said ceramic material is in the form of a sintered compact of ceramic material and includes a fiber envelope for said sintered compact comprising inorganic fibers and having a thickness of 1 to 7 mm and a density of 0.8 to 1.2 grams per cubic centimeter.
Claim 2
Dependent Claim
76 words
In a thermal insulation lining of ceramic material for a hot gas duct enveloped in cast metal, especially in the cylinder head of an internal combustion engine, the improvement wherein said ceramic material is in the form of a sintered compact of ceramic material and includes a fiber envelope for said sintered compact comprising inorganic fibers and having a thickness of 1 to 7 mm and a density of 0.8 to 1.2 grams per cubic centimeter.
Claim 3
Dependent Claim
16 words
The thermal insulation lining of claim 1 wherein said fiber envelope consists essentially of inorganic fibers.
Claim 4
Dependent Claim
27 words
The thermal insulation lining of claim 1, wherein the inorganic fibers can withstand heat of up to at least 1500° C. for a short time before disintegrating.
Claim 5
Dependent Claim
14 words
The thermal insulation lining of claim 1 wherein the inorganic fibers are mineral fibers.
Claim 6
Dependent Claim
22 words
The thermal insulation lining of claim 1 wherein said inorganic fibers are mineral fibers of aluminum oxide, zirconium oxide, mullite or kaolinite.
Claim 7
Dependent Claim
19 words
The thermal insulation lining of claim 1 wherein said fiber envelope has a thickness of 2 to 6 mm.
Claim 8
Dependent Claim
29 words
The thermal insulation lining of claim 1 wherein the sintered compact is formed of mullite, zirconium oxide, magnesium auminum silicate, magnesium aluminum titanate, aluminum titanate or lithium aluminum silicate.
Claim 9
Dependent Claim
26 words
The thermal insulation lining of claim 1 wherein the fiber envelope consists of inorganic fibers and a ceramic material as binding agent for the inorganic fibers.
Claim 10
Dependent Claim
26 words
The thermal insulation lining of claim 1 consisting of a sintered compact of aluminum titanate which has an envelope formed from inorganic fibers and aluminum titanate.
Claim 11
Dependent Claim
108 words
A thermal insulation lining for a hot gas duct enveloped in metal, for use in the cylinder head of an internal combustion engine, comprising a sintered compact of ceramic material selected from the group consisting of mullite, zirconium oxide, magnesium aluminum silicate, magnesium aluminum titanate; aluminum titanate; or lithium aluminum silicate; said sintered compact being enveloped in an inorganic fiber envelope having a thickness of 1 to 7 mm, a density of 0.8 to 1.2 grams per cubic centimeter and comprising mineral fibers selected from the group consisting of aluminum oxide, zirconium oxide, mullite or kaolinite, or said mineral fibers and said ceramic material as a binding agent.
Claim 12
Dependent Claim
108 words
A thermal insulation lining for a hot gas duct enveloped in metal, for use in the cylinder head of an internal combustion engine, comprising a sintered compact of ceramic material selected from the group consisting of mullite, zirconium oxide, magnesium aluminum silicate, magnesium aluminum titanate; aluminum titanate; or lithium aluminum silicate; said sintered compact being enveloped in an inorganic fiber envelope having a thickness of 1 to 7 mm, a density of 0.8 to 1.2 grams per cubic centimeter and comprising mineral fibers selected from the group consisting of aluminum oxide, zirconium oxide, mullite or kaolinite, or said mineral fibers and said ceramic material as a binding agent.
Claim 13
Dependent Claim
86 words
A thermal insulation lining of ceramic material, for a hot gas duct enveloped in metal, for use in the cylinder head of an internal combustion engine, comprising a sintered compact of aluminum titanate enveloped in an inorganic fiber envelope having a thickness of 1 to 7 mm, a density of 0.8 to 1.2 grams per cubic centimeter and comprising mineral fibers selected from the group consisting of aluminum oxide, zirconium oxide, mullite or kaolinite, or said mineral fibers mixed with aluminum titanate as a binding agent.
Claim 14
Dependent Claim
86 words
A thermal insulation lining of ceramic material, for a hot gas duct enveloped in metal, for use in the cylinder head of an internal combustion engine, comprising a sintered compact of aluminum titanate enveloped in an inorganic fiber envelope having a thickness of 1 to 7 mm, a density of 0.8 to 1.2 grams per cubic centimeter and comprising mineral fibers selected from the group consisting of aluminum oxide, zirconium oxide, mullite or kaolinite, or said mineral fibers mixed with aluminum titanate as a binding agent.
Claim 15
Dependent Claim
29 words
A method for the production of thermal insulation lining of claim 1 wherein the inorganic fibers are sprayed onto the sintered compact from a slip containing a ceramic substance.
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) | 1988-07-01 | 1988-12-31 | 1989-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-01 | 1992-12-31 | 1993-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-01 | 1996-12-31 | 1997-07-02 | $7700.00 | Window Closed / Lapsed |