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US4852542A Expired / Lapsed US ⏱️ 0.0 years remaining

Thin thermal barrier coating for engines

Assignee: Adiabatics Inc
•
Filing: 1987-10-23
•
Granted: 1989-08-01
•
Expires: 2007-10-23
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Abstract

Abstract Thin thermal barrier coating of a specified thickness of 0.002 to 0.009 inch to insulate the combustion chamber of an internal combustion engine to achieve optimum reduction of transient head flow. The coating is of an optimum thickness to reduce in-cylinder heat loss in the combustion chamber during combustion, thus increasing engine efficiency, specific power output, and reducing emissions. However, the temperature increase is not so great as to adversely affect engine lubricant life or volumetric efficiency. The invention is particularly suitable for gasoline engines as it does not cause preignition or knocking that is generally caused by insulating coatings of greater thickness. In addition, the invention is particulalry suitable for aluminum combustion chamber components. The thinner coating also results in improved reliability and durability by reducing chipping and cracking failure tendencies associated with ceramic coatings.

Inventors

  • 👤 Roy Kamo
  • 👤 Melvin E. Woods
  • 👤 W. Bryzik

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-01 12:52
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/02; F02B77/11; F02B1/00; F02B1/02; F02B1/04; F05; F05C; F05C2203/00; F05C2203/08; F05C2251/00; F05C2251/04; F05C2251/048

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 28 words
An internal combustion engine combustion chamber component having on a surface thereof a layer of thermally insulative material of a thickness of approximately 0.002 inch to 0.009 inch.
Claim 2
Dependent Claim 28 words
An internal combustion engine combustion chamber component having on a surface thereof a layer of thermally insulative material of a thickness of approximately 0.002 inch to 0.009 inch.
Claim 3
Dependent Claim 21 words
The combustion chamber component of claim 1 wherein said insulative material has particles of chromium oxide dispersed at least partially therewithin.
Claim 4
Dependent Claim 15 words
The combustion chamber component of claim 1 wherein said insulative material comprises a refractory oxide.
Claim 5
Dependent Claim 13 words
The combustion chamber component of claim 3 wherein said insulative material comprises zirconia.
Claim 6
Dependent Claim 21 words
The combustion chamber component of claim 4 wherein said insulative material has particles of chromium oxide dispersed at least partially therewithin.
Claim 7
Dependent Claim 50 words
The combustion chamber component of claim 1 wherein said insulative material is selected from the group consisting of CrC, HfC, NbC, TaC, TiN, CrN, HfN, NbN, TaN, TiN, Cr 2 O 3 , HfO 2 , Nb 2 O 3 , Ta 2 O 5 , and TiO 2 .
Claim 8
Dependent Claim 25 words
The combustion chamber component of claim 1 further comprising a binder disposed between the surface of the component and the layer of thermally insulative material.
Claim 9
Dependent Claim 23 words
The combustion chamber component of claim 1, wherein the combustion chamber component to which the insulative material is attached is comprised of aluminum.

References Cited (Backward Citations)

US3919755A Cited
US4376374A Cited
US4538562A Cited
US4495907A Cited
US4711208A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-07-31 1993-01-30 1993-08-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-07-31 1997-01-30 1997-08-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-07-31 2001-01-30 2001-08-01 $7700.00 Window Closed / Lapsed

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