EP0996752B1 - Legierung für korrosionsbeständige beschichtungen oder oberflächenbeschichtungen - Google Patents

Legierung für korrosionsbeständige beschichtungen oder oberflächenbeschichtungen Download PDF

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Publication number
EP0996752B1
EP0996752B1 EP98929635A EP98929635A EP0996752B1 EP 0996752 B1 EP0996752 B1 EP 0996752B1 EP 98929635 A EP98929635 A EP 98929635A EP 98929635 A EP98929635 A EP 98929635A EP 0996752 B1 EP0996752 B1 EP 0996752B1
Authority
EP
European Patent Office
Prior art keywords
metal
alloy
yttrium
main group
cobalt
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.)
Expired - Lifetime
Application number
EP98929635A
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English (en)
French (fr)
Other versions
EP0996752A1 (de
Inventor
Nelso Antolotti
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.)
Turbocoating SpA
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Turbocoating SpA
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Filing date
Publication date
Application filed by Turbocoating SpA filed Critical Turbocoating SpA
Publication of EP0996752A1 publication Critical patent/EP0996752A1/de
Application granted granted Critical
Publication of EP0996752B1 publication Critical patent/EP0996752B1/de
Anticipated expiration legal-status Critical
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Classifications

    • 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
    • C23C30/00—Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C19/00—Alloys based on nickel or cobalt
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt

Definitions

  • the present invention relates to an alloy for anti-corrosive coatings or surface coatings which are resistant up to 1100°C.
  • Such surface coatings can be obtained by the following thermal spraying methods:
  • Said alloy is resistant to corrosion and guarantees a service life of 1000 hours if used for the coating of components which operate in the presence of sodium-, vanadium-, sulphur- and chlorine-containing hydrocarbon combustion products.
  • a first disadvantage is that this alloy does not guarantee sufficient corrosion resistance if employed at temperatures above 700°C.
  • Said second alloy is used for coating components with a superalloy material.
  • the presence of silicon in the coating matrix provides resistance against the formation of oxides and sulphides on the surface layer.
  • this second alloy has a low yttrium content, which is insufficient for ensuring corrosion resistance in the presence of products containing substantial amounts of sulphur, chlorine and vanadium.
  • a third alloy is known from US 4,585,481, which describes an alloy based on cobalt and containing chromium, aluminium, yttrium and silicon in the following proportions: Chromium (Cr) 5.0 - 40.0% Aluminium (Al) 8.0 - 35.0% Yttrium (Y) 0.1 - 2.0% Silicon (Si) 0.1 - 7.0% Cobalt (Co) remaining percentage.
  • this alloy results in a reduction of the plasticity of the coating, making it impossible to use it for the coating of apparatuses or objects which must withstand substantial changes in temperature.
  • a further disadvantage is that, during application of the coating or surface coating by the plasma method, oxidation of yttrium and silicon may take place.
  • This third alloy is unable to guarantee the corrosion resistance required in the presence of combustion products containing substantial amounts of sulphur, chlorine and vanadium.
  • the alloys mentioned above can usually be used at temperatures not exceeding 900°C. since all of them are based on cobalt.
  • RU-A-2051196 teaches an alloy for corrosion-resistant coatings or surface coatings, containing of cobalt, chromium, aluminium, yttrium, silicon, and a metal from the second main group, together with the corresponding oxide, in the following proportions: Chromium (Cr) 26.0 - 30.0% Aluminium (Al) 6.0 - 8.0% Yttrium (Y) 0.3 - 1.5% Silicon (Si) 1.5 - 4.5% Metal from the second main group (magnesium, calcium, barium, strontium) 0.1 - 0.5% Oxide of the corresponding metal from the second main group 0.1 - 1.0% Cobalt (Co) remaining percentage.
  • This alloy resists only up to 800°C.
  • the object of the present invention is to eliminate the abovementioned disadvantages and provide an alloy with excellent performance even at high temperatures, in particular even above 1000°C.
  • alloy for corrosion-resistant coatings or surface coatings and which is characterized by the composition defined in claim 1, with preferred embodiments in claims 2 and 3.
  • the Applicant has realized that the disadvantages of the known alloys based on cobalt and containing chromium, aluminium, yttrium and silicon can be avoided by adding one the metals from the second main group (magnesium, calcium, barium, strontium), both in free form and in the form of the oxide.
  • the alloy according to the present invention is an alloy for anti-corrosive surface coatings which is based on cobalt and contains chromium, aluminium, yttrium, silicon, and a metal from the second main group, together with the. corresponding oxide, in the following proportions: Chromium (Cr) 22.0 - 31.0% Aluminium (Al) 5.5 -13.0% Yttrium (Y) 0.3 - 1.5% Silicon (Si) 1.5 - 10.0% Metal from the second main group (Mg, Ca, Ba, Sr) 0.1 - 2.0% Oxide of the corresponding metal (Mg, Ca, Ba, Sr) from the second main group 0.1 - 2.0% Tantalum (Ta) 0.5 - 4.0% Me remaining percentage where Me denotes a metal which can be nickel (Ni) or iron (Fe) or cobalt (Co) or a composition consisting of Ni-Fe-Co, Ni-Fe, Fe-Co, NI-Co.
  • rhenium (Re) is envisaged as being present in a percentage of 2.0 - 11.0.
  • yttrium (Y) by an yttrium/hafnium (Y/Hf) composition having the same percentage (0.3 -1.5%), relative to the total of the components, achieves better adhesion of the alumina, Al 2 O 3 , to the surface of the coating.
  • the combination of silicon with the metal from the second main group and its oxide makes it possible to maintain the operational capacity of the surface coating obtained when applied by plasma spraying in air or by high-velocity flame spraying.
  • the presence of the metal from the second main group (Mg, Ca, Ba, Sr) in the proportions mentioned prevents the yttrium and silicon from being oxidized during application of the coating or surface coating.
  • a lower content of silicon, of the metal from the second main group and its oxide in the alloy based on nickel, iron and cobalt according to the present invention does not increase the corrosion resistance of the coating.
  • a higher content of silicon, yttrium, metal from the second main group and its oxide in the alloy according to the present invention produces a deterioration in the mechanical characteristics of the coating obtained, increases the fragility, reduces the coefficient of thermal expansion, and thus causes the coating to form cracks and to flake and therefore lowers the protection with respect to corrosion caused by sulpho-oxidation.
  • the addition of tantalum and/or rhenium furthermore results in a significantly improved performance at oxidation temperature levels above temperatures of 1000°C.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Preventing Corrosion Or Incrustation Of Metals (AREA)
  • Coating By Spraying Or Casting (AREA)
  • Physical Vapour Deposition (AREA)
  • Chemically Coating (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Claims (3)

  1. Legierung für korrosionsbeständige Beschichtungen oder Oberflächenbeschichtungen bestehend aus Chrom, Aluminium, Yttrium, Hafnium, Silikon und einem Metall der zweiten Hauptgruppe mit dem entsprechenden Oxyd, Tantal (bedarfsweise) und einem oder mehreren Metallen der Gruppe Ni, Fe und Co in folgenden Gewichtsanteilen Chrom (Cr) 22,0-31,0% Aluminium (Al) 5,5-13,0% Yttrium+Hafnium-Zusammensetzung (Y+Hf) 0,3-1,5% Silikon (Si) 1,5-10,0% Metall der zweiten Hauptgruppe Mg, Ca, Ba, Sr 0,1-2,0% Oxyd des entsprechenden Metalls Mg, Ca, Ba, Sr der zweiten Hauptgruppe 0,1-2,0% und Zusatz von Tantal (Ta) 0,5-4,0% bzw. Rhenium (Re) 2,0-11,0% Me Restgewichtsanteil,
    wobei das Metall Me sowohl Nickel (Ni) als auch Eisen (Fe) als auch Kobalt (Co) als auch eine aus Ni-Fe-Co, Ni-Fe, Ni-Co, Fe-Co bestehende Zusammensetzung sein kann.
  2. Legierung nach Anspruch 1, bei der die Legierung mithilfe von atmosphärischem Plasmaspritzen (APS) oder Vakuum-Plasmaspritzen (VPS) aufgebracht werden kann.
  3. Korrosionsschutzbeschichtung, dadurch gekennzeichnet, dass zu ihrer Herstellung eine Legierung gemäss einem der vorhergehenden Ansprüche benutzt wird.
EP98929635A 1997-07-10 1998-06-19 Legierung für korrosionsbeständige beschichtungen oder oberflächenbeschichtungen Expired - Lifetime EP0996752B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT97PR000039A IT1294098B1 (it) 1997-07-10 1997-07-10 Lega per rivestimenti o riporti resistenti alla corrosione.
ITPR970039 1997-07-10
PCT/IT1998/000167 WO1999002745A1 (en) 1997-07-10 1998-06-19 Alloy for corrosion-resistant coatings or surface coatings

Publications (2)

Publication Number Publication Date
EP0996752A1 EP0996752A1 (de) 2000-05-03
EP0996752B1 true EP0996752B1 (de) 2002-05-02

Family

ID=11396108

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98929635A Expired - Lifetime EP0996752B1 (de) 1997-07-10 1998-06-19 Legierung für korrosionsbeständige beschichtungen oder oberflächenbeschichtungen

Country Status (5)

Country Link
EP (1) EP0996752B1 (de)
AT (1) ATE217032T1 (de)
DE (1) DE69805179T2 (de)
IT (1) IT1294098B1 (de)
WO (1) WO1999002745A1 (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19926669A1 (de) 1999-06-08 2000-12-14 Abb Alstom Power Ch Ag NiAl-beta-Phase enthaltende Beschichtung
US6346134B1 (en) * 2000-03-27 2002-02-12 Sulzer Metco (Us) Inc. Superalloy HVOF powders with improved high temperature oxidation, corrosion and creep resistance
JP4166977B2 (ja) * 2001-12-17 2008-10-15 三菱重工業株式会社 耐高温腐食合金材、遮熱コーティング材、タービン部材、及びガスタービン
DE50300758D1 (de) 2002-01-18 2005-08-18 Alstom Technology Ltd Baden Hochtemperatur-schutzschicht
DE502005010521D1 (de) * 2005-11-24 2010-12-23 Siemens Ag Legierung, Schutzschicht und Bauteil
KR101753094B1 (ko) * 2015-08-25 2017-07-04 한국기계연구원 절삭 가공성, 내산화성 및 심미성이 우수한 Co-Cr계 치과용 합금

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4585481A (en) * 1981-08-05 1986-04-29 United Technologies Corporation Overlays coating for superalloys
DE3246504A1 (de) * 1982-12-16 1984-06-20 BBC Aktiengesellschaft Brown, Boveri & Cie., Baden, Aargau Hochtemperatur-schutzschicht
DE3842300A1 (de) * 1988-12-16 1990-06-21 Asea Brown Boveri Hochtemperatur-schutzschicht
RU2051196C1 (ru) * 1993-11-26 1995-12-27 Совместное Российско-Итальянское предприятие "Интеркоут Турбинсервис" Сплав на основе кобальта
KR100354411B1 (ko) * 1994-10-14 2002-11-18 지멘스 악티엔게젤샤프트 부식,산화및과도한열응력으로부터부품을보호하기위한보호층및그제조방법

Also Published As

Publication number Publication date
ITPR970039A1 (it) 1999-01-10
ITPR970039A0 (it) 1997-07-10
EP0996752A1 (de) 2000-05-03
ATE217032T1 (de) 2002-05-15
DE69805179T2 (de) 2002-11-14
DE69805179D1 (de) 2002-06-06
WO1999002745A1 (en) 1999-01-21
IT1294098B1 (it) 1999-03-22

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