EP0500854B1 - A coating, and a coating method, for a steam turbine and adjoining steel surfaces - Google Patents

A coating, and a coating method, for a steam turbine and adjoining steel surfaces Download PDF

Info

Publication number
EP0500854B1
EP0500854B1 EP91915315A EP91915315A EP0500854B1 EP 0500854 B1 EP0500854 B1 EP 0500854B1 EP 91915315 A EP91915315 A EP 91915315A EP 91915315 A EP91915315 A EP 91915315A EP 0500854 B1 EP0500854 B1 EP 0500854B1
Authority
EP
European Patent Office
Prior art keywords
coating
chromium
aluminum
steel
weight
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.)
Revoked
Application number
EP91915315A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0500854A1 (en
Inventor
Jaakko Tenkula
Bjarne Hellman
Jorma Majava
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.)
Telatek Oy
Original Assignee
Telatek Oy
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8531016&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0500854(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Telatek Oy filed Critical Telatek Oy
Publication of EP0500854A1 publication Critical patent/EP0500854A1/en
Application granted granted Critical
Publication of EP0500854B1 publication Critical patent/EP0500854B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288—Protective coatings for blades
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
    • C23C4/18—After-treatment
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D25/00—Component parts, details, or accessories, not provided for in, or of interest apart from, other groups
    • F01D25/007—Preventing corrosion

Definitions

  • the invention relates to a coating intended for protecting the interior surfaces of a steam turbine and the adjoining pipes and superheaters, the coating preventing the erosive and corrosive wear caused by steam.
  • the invention also relates to a method for coating the interior surfaces of a steam turbine and the adjoining pipes and superheaters.
  • the damage caused by wear may lead to the need for fill-in and repair weldings which are difficult to carry out, and even replacement of the turbine casing and pipes.
  • Ceramic coatings have, for example, the following disadvantages:
  • the primary object of the present invention is to provide a coating which can be used for coating the casing, division planes, piping, superheaters and other parts of a steam turbine so that reliable and long-term protection, suitable for the conditions involved, is obtained for the steel surfaces. It is a further object of the invention that the coating work can be carried out on the site rapidly and economically, and that the coating is also well suited for the coating of surfaces which are to be machined.
  • the coating on a steel part according to the invention is characterized in that the coating comprises a coating layer which is obtainable by the thermal spraying of a steel alloyed with chromium and aluminum in the below stated amounts, which, during the coating process, oxidize in the spray, whereby chromium and aluminum oxides are formed which will remain inside the coating, surrounded by a steel matrix, and on the surface of the coating layer there will form, after the coating process, under the oxidizing effect of air, a dense chromium and aluminum oxide film.
  • the coating method according to the invention is characterized in that a coating material of steel alloyed with chromium and aluminum in the below stated amounts is sprayed thermally onto the surface being coated, and this coating material oxidizes in the spray during the coating process, whereby chromium and aluminum oxides are formed which will remain inside the coating, surrounded by a steel matrix, and that, after the coating process, the coating which has been formed will be exposed to the oxidizing effect of air, whereby a dense chromium and aluminum oxide film will be formed on the surface of the coating.
  • the coating material used is a steel containing chromium 20 - 45 % by weight, aluminum 5 - 15 % by weight and molybdenum 0 - 5 % by weight, and especially preferably chromium 22 - 30 % by weight, aluminum 5 - 8 % by weight and molybdenum 0 - 3 % by weight.
  • the coating material may be thread-like or pulverous.
  • the chromium and aluminum oxide film in the coating according to the invention formed under the effect of oxidation after the coating process, is strong and dense, and will prevent erosive and corrosive wear caused by wet steam.
  • the coating according to the invention can be prepared by thermal spraying, by using flame, arc, plasma and/or supersonic spraying, but primarily arc, plasma and/or supersonic spraying, in order to obtain good adhesion of the coating to the base material.
  • the coating according to the invention a layer with good adhesion to the base material, a steel coating which contains a large amount of oxides, and a surface layer which consists of a dense oxide film.
  • the thickness of the coating should be at minimum 0.3 mm, preferably, however, 0.5 mm.
  • the thickness of the coating may be up to 2.5 mm without its pealing off because of internal shrinkage of the coating.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Plasma & Fusion (AREA)
  • Metallurgy (AREA)
  • Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • External Artificial Organs (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
  • Vehicle Body Suspensions (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
EP91915315A 1990-09-04 1991-09-03 A coating, and a coating method, for a steam turbine and adjoining steel surfaces Revoked EP0500854B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI904369 1990-09-04
FI904369A FI88935C (fi) 1990-09-04 1990-09-04 Foerfarande foer belaeggande av en aongturbin och daertill anslutna staolytor
PCT/FI1991/000269 WO1992004480A1 (en) 1990-09-04 1991-09-03 A coating, and a coating method, for a steam turbine and adjoining steel surfaces

Publications (2)

Publication Number Publication Date
EP0500854A1 EP0500854A1 (en) 1992-09-02
EP0500854B1 true EP0500854B1 (en) 1995-01-04

Family

ID=8531016

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91915315A Revoked EP0500854B1 (en) 1990-09-04 1991-09-03 A coating, and a coating method, for a steam turbine and adjoining steel surfaces

Country Status (13)

Country Link
EP (1) EP0500854B1 (ru)
AT (1) ATE116690T1 (ru)
CA (1) CA2067727A1 (ru)
CZ (1) CZ281667B6 (ru)
DE (1) DE69106494T2 (ru)
DZ (1) DZ1526A1 (ru)
ES (1) ES2066464T3 (ru)
FI (1) FI88935C (ru)
HU (1) HU212746B (ru)
PL (1) PL167643B1 (ru)
RU (1) RU2085612C1 (ru)
SK (1) SK281564B6 (ru)
WO (1) WO1992004480A1 (ru)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI96970C (fi) * 1994-08-09 1996-09-25 Telatek Oy Menetelmä teräspintojen kunnostamiseksi
GB201106276D0 (en) * 2011-04-14 2011-05-25 Rolls Royce Plc Annulus filler system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA1004964A (en) * 1972-05-30 1977-02-08 Union Carbide Corporation Corrosion resistant coatings and process for making the same
US3864093A (en) * 1972-11-17 1975-02-04 Union Carbide Corp High-temperature, wear-resistant coating

Also Published As

Publication number Publication date
SK281564B6 (sk) 2001-05-10
RU2085612C1 (ru) 1997-07-27
FI88935C (fi) 1993-07-26
FI904369A (fi) 1992-03-05
DE69106494D1 (de) 1995-02-16
WO1992004480A1 (en) 1992-03-19
ES2066464T3 (es) 1995-03-01
HU9201467D0 (en) 1992-09-28
CA2067727A1 (en) 1992-03-05
CS271591A3 (en) 1992-04-15
FI88935B (fi) 1993-04-15
ATE116690T1 (de) 1995-01-15
DE69106494T2 (de) 1995-05-11
FI904369A0 (fi) 1990-09-04
PL167643B1 (pl) 1995-10-31
EP0500854A1 (en) 1992-09-02
DZ1526A1 (fr) 2004-09-13
HU212746B (en) 1996-10-28
HUT60792A (en) 1992-10-28
CZ281667B6 (cs) 1996-12-11

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