DE19530914A1 - Coating structure for highly reflective catalytic surface of i.c. engine - Google Patents

Coating structure for highly reflective catalytic surface of i.c. engine

Info

Publication number
DE19530914A1
DE19530914A1 DE19530914A DE19530914A DE19530914A1 DE 19530914 A1 DE19530914 A1 DE 19530914A1 DE 19530914 A DE19530914 A DE 19530914A DE 19530914 A DE19530914 A DE 19530914A DE 19530914 A1 DE19530914 A1 DE 19530914A1
Authority
DE
Germany
Prior art keywords
highly reflective
layer
catalytic
engine
coating structure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE19530914A
Other languages
German (de)
Inventor
Josef Hoesl
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to DE19530914A priority Critical patent/DE19530914A1/en
Publication of DE19530914A1 publication Critical patent/DE19530914A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B77/00—Component parts, details or accessories, not otherwise provided for
    • F02B77/02—Surface coverings of combustion-gas-swept parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B51/00—Other methods of operating engines involving pretreating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines
    • F02B51/02—Other methods of operating engines involving pretreating of, or adding substances to, combustion air, fuel, or fuel-air mixture of the engines involving catalysts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2201/00—Metals
    • F05C2201/04—Heavy metals
    • F05C2201/0418—Noble metals
    • F05C2201/0421—Silver
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05C—INDEXING SCHEME RELATING TO MATERIALS, MATERIAL PROPERTIES OR MATERIAL CHARACTERISTICS FOR MACHINES, ENGINES OR PUMPS OTHER THAN NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES
    • F05C2203/00—Non-metallic inorganic materials
    • F05C2203/08—Ceramics; Oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Combustion Methods Of Internal-Combustion Engines (AREA)
  • Catalysts (AREA)

Abstract

Highly reflective catalytic combustion or working chamber surfaces of internal combustion engines, in which fuel is injected directly into the combustion chamber and which have a lambda ratio of at least 1, have a coating formed by an Al2O3 layer produced by hard anodising. The coating is wetted with high-purity AgNO3 soln., which is thermally decomposed to produce a catalytic Ag layer. Wetting may be carried out with a painting unit and a torch flame may be used for decomposition.

Description

Die Erfindung betrifft eine Weiterentwicklung von DE 43 17 254 A1.The invention relates to a further development of DE 43 17 254 A1.

Gegenstand der Erfindung ist ein Schichtaufbauverfahren für hochreflektierende, katalytische Brenn- bzw. Arbeitsraumoberflächen von Verbrennungskraftmaschinen, mit Kraftstoffeinspritzung direkt in den Brennraum und einem λ-Verhältnis 1, zur Verringerung des Strahlungswärmeübergangs auf diese Oberflächen, gekennzeichnet dadurch, daß eine hartanodisch erzeugte Al₂O₃-Schicht mit hochreiner AgNO₃-Lösung benetzt wird und durch thermische Zersetzung dieser Lösung die katalytische Silberschicht entsteht. Der Vorteil dieser Erfindung liegt darin, daß aufgrund der relativ niedrigen Wärmeleitfähigkeit der Al₂O₃- Schicht, die maximale Wandtemperatur an der Silberoberfläche, je nach dem jeweiligen Wärmedurchgang durch den Schichtaufbau, um bis zu 200 K höher liegt. Diese höhere Wandtemperatur bedingt eine größere Beständigkeit der Silberschicht gegen die Korrosion durch Schwefel.The invention relates to a layer construction method for highly reflective, catalytic combustion or workspace surfaces of internal combustion engines, with fuel injection directly into the Combustion chamber and a λ ratio 1, for reduction the radiation heat transfer to these surfaces, characterized in that a hard anodized Al₂O₃ layer with high purity AgNO₃ solution is wetted and by thermal decomposition of these Solution the catalytic silver layer is created. The advantage of this invention is that the relatively low thermal conductivity of Al₂O₃- Layer, the maximum wall temperature on the silver surface, depending on the respective heat transfer through the layer structure is up to 200 K higher. These higher wall temperatures require greater resistance the silver layer against corrosion Sulfur.

Als Nebeneffekt ergibt sich eine weitere Verringerung der Energieverluste.As a side effect, there is a further reduction of energy losses.

Hartanodisieren ist Stand der Technik. Die meisten Al- Legierungen des Motorenbaus sind zum Hartanodisieren geeignet. Bei Bauteilen aus anderen Materialien (Einlaßventil, Wärmeschutzscheiben der Einspritzdüsen) liegt eine Lösung im Materialwechsel oder im Aufbringen einer Al-Schicht durch "Thermisches Spritzen". Hartanodische Al₂O₃-Schichten haben relativ hohe Haft- und Temperaturwechselfähigkeiten.Hard anodizing is state of the art. Most Al Alloys of engine construction are for hard anodizing suitable. For components made of other materials (inlet valve, Injector heat shields) there is a solution in material change or application an Al layer by "thermal spraying". Hard anodic Al₂O₃ layers have relatively high Adhesion and temperature change capabilities.

Die Benetzung der Al₂O₃-Schicht mit AgNO₃-Lösung kann mit Lackiergeräten erfolgen. Zur thermischen Zersetzung der AgNO₃-Lösung ist eine (flache) Brennerflamme geeignet.The wetting of the Al₂O₃ layer with AgNO₃ solution can be done with painting equipment. For thermal decomposition the AgNO₃ solution is a (flat) burner flame suitable.

Claims (1)

Schichtaufbauverfahren für hochreflektierende, katalytische Brenn- bzw. Arbeitsraumoberflächen von Verbrennungskraftmaschinen, mit Kraftstoffeinspritzung direkt in den Brennraum und einem λ-Verhältnis 1, zur Verringerung des Strahlungswärmeübergangs auf diese Oberflächen, gekennzeichnet dadurch, daß eine hartanodisch erzeugte Al₂O₃-Schicht mit hochreiner AgNO₃-Lösung benetzt wird und durch thermische Zersetzung dieser Lösung die Silberschicht entsteht.Layer construction process for highly reflective, catalytic combustion or work space surfaces of internal combustion engines, with fuel injection directly into the combustion chamber and a λ ratio 1, to reduce the radiation heat transfer to these surfaces, characterized in that a hard anodized Al₂O₃ layer is wetted with high-purity AgNO₃ solution and the silver layer is formed by thermal decomposition of this solution.
DE19530914A 1995-08-23 1995-08-23 Coating structure for highly reflective catalytic surface of i.c. engine Withdrawn DE19530914A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19530914A DE19530914A1 (en) 1995-08-23 1995-08-23 Coating structure for highly reflective catalytic surface of i.c. engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19530914A DE19530914A1 (en) 1995-08-23 1995-08-23 Coating structure for highly reflective catalytic surface of i.c. engine

Publications (1)

Publication Number Publication Date
DE19530914A1 true DE19530914A1 (en) 1996-05-09

Family

ID=7770127

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19530914A Withdrawn DE19530914A1 (en) 1995-08-23 1995-08-23 Coating structure for highly reflective catalytic surface of i.c. engine

Country Status (1)

Country Link
DE (1) DE19530914A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19748259A1 (en) * 1997-10-31 1999-05-06 Bosch Gmbh Robert Combustion chamber for water heaters, especially gas heaters
EP0972921A1 (en) * 1998-07-14 2000-01-19 Konotech s.r.o. Internal combustion piston engine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19748259A1 (en) * 1997-10-31 1999-05-06 Bosch Gmbh Robert Combustion chamber for water heaters, especially gas heaters
EP0972921A1 (en) * 1998-07-14 2000-01-19 Konotech s.r.o. Internal combustion piston engine

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Legal Events

Date Code Title Description
OAV Applicant agreed to the publication of the unexamined application as to paragraph 31 lit. 2 z1
8122 Nonbinding interest in granting licences declared
8120 Willingness to grant licences paragraph 23
8139 Disposal/non-payment of the annual fee