WO1999002745A1 - Alloy for corrosion-resistant coatings or surface coatings - Google Patents
Alloy for corrosion-resistant coatings or surface coatings Download PDFInfo
- Publication number
- WO1999002745A1 WO1999002745A1 PCT/IT1998/000167 IT9800167W WO9902745A1 WO 1999002745 A1 WO1999002745 A1 WO 1999002745A1 IT 9800167 W IT9800167 W IT 9800167W WO 9902745 A1 WO9902745 A1 WO 9902745A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- metal
- yttrium
- alloy
- main group
- cobalt
- Prior art date
Links
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: plasma spraying in vacuo, plasma spraying in air, HVOF (High- Velocity Oxygen Fuel) or high-velocity oxygen flame.
- thermal spraying methods plasma spraying in vacuo, plasma spraying in air, HVOF (High- Velocity Oxygen Fuel) or high-velocity oxygen flame.
- 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.
- Cobalt (Co) remaining pe is also known.
- 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:
- this alloy has a silicon content which is normally above 4.5% and therefore 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.
- 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. Said objects are fully achieved by the alloy, according to the present invention, for corrosion-resistant coatings or surface coatings and which is characterized by the contents of the claims indicated below and in particular in that it comprises:
- 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 of the metals from the second main group (magnesium, calcium, barium, strontium), both in free form and in the form of the oxide, in the abovementioned proportions.
- the present invention also relates to a subsequently modified alloy in which the components are present in the following proportions:
- Me remaining percentage in which Me is a metal which can be nickel (Ni) or iron (Fe) or cobalt (Co) or a composition comprising Ni-Fe-Co, Ni-Co, Ni-Fe, Fe-Co.
- rhenium (Re) may also be present in a percentage of 2.0 - 1 1.0%.
- 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) 26.0 - 30.0%
- Co Cobalt (Co) remaining percentage.
- the addition of one of the metals from the second main group (magnesium, calcium, barium, strontium), both in free form and in the form of the oxide, in the abovementioned proportions, does indeed avoid the disadvantages of the cobalt-based alloys of the prior art.
- the second alloy differs from the preceding one mainly by:
- Metal from the second main group (Mg, Ca, Ba, Sr) 0.1 - 2.0%
- Me remaining percentage where Me denotes a metal which can be nickel (Ni) or iron (Fe) or cobalt (Co) or a composition comprising Ni-Fe-Co.
- rhenium (Re) is envisaged as being present in a percentage of 2.0 - 1 1.0.
- the predominant presence of the metal denoted by Me and the content of chromium and aluminium in the percentages given ensure that the coating obtained exhibits a base and two phases: the ⁇ -phase matrix on top of an Me-Cr base and the free Me-Al ⁇ -phase.
- the presence of aluminium on the surface of the coating in the abovementioned percentage results in the formation of a protective Al 2 O 3 layer which gives the coating obtained improved corrosion resistance.
- 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.
- Y/Hf yttrium/hafnium
- 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)
- Physical Vapour Deposition (AREA)
- Coating By Spraying Or Casting (AREA)
- Chemically Coating (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AT98929635T ATE217032T1 (en) | 1997-07-10 | 1998-06-19 | ALLOY FOR CORROSION-RESISTANT COATINGS OR SURFACE COATINGS |
EP98929635A EP0996752B1 (en) | 1997-07-10 | 1998-06-19 | Alloy for corrosion-resistant coatings or surface coatings |
US09/462,272 US6355212B1 (en) | 1997-07-10 | 1998-06-19 | Alloy for corrosion-resistant coatings or surface coatings |
DE69805179T DE69805179T2 (en) | 1997-07-10 | 1998-06-19 | ALLOY FOR CORROSION RESISTANT COATINGS OR SURFACE COATINGS |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97PR000039A IT1294098B1 (en) | 1997-07-10 | 1997-07-10 | CORROSION RESISTANT ALLOY OR COATINGS. |
ITPR97A000039 | 1997-07-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999002745A1 true WO1999002745A1 (en) | 1999-01-21 |
Family
ID=11396108
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT1998/000167 WO1999002745A1 (en) | 1997-07-10 | 1998-06-19 | Alloy for corrosion-resistant coatings or surface coatings |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0996752B1 (en) |
AT (1) | ATE217032T1 (en) |
DE (1) | DE69805179T2 (en) |
IT (1) | IT1294098B1 (en) |
WO (1) | WO1999002745A1 (en) |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1061150A2 (en) * | 1999-06-08 | 2000-12-20 | ABB Alstom Power (Schweiz) AG | Coating containing NiAl beta Phases |
EP1272301A1 (en) * | 2000-03-27 | 2003-01-08 | Sulzer Metco (US) Inc. | Superalloy hvof powders with improved high temperature oxidation, corrosion and creep resistance |
EP1319730A1 (en) * | 2001-12-17 | 2003-06-18 | Mitsubishi Heavy Industries, Ltd. | High temperature corrosion resistant alloy, thermal barrier coating material with metal bonding layer, and gas turbine using high temperature corrosion resistant alloy |
WO2003060194A1 (en) * | 2002-01-18 | 2003-07-24 | Alstom Technology Ltd | High-temperature protective coating |
EP1790746A1 (en) * | 2005-11-24 | 2007-05-30 | Siemens Aktiengesellschaft | Alloy, protective layer and component |
CN107406919A (en) * | 2015-08-25 | 2017-11-28 | 韩国机械研究院 | Machinability, inoxidizability, corrosion resistance and the outstanding Co Cr class dental alloys of taste |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4503122A (en) * | 1982-12-16 | 1985-03-05 | Bbc Aktiengesellschaft Brown, Boveri & Cie | High-temperature protection layer |
US4585481A (en) * | 1981-08-05 | 1986-04-29 | United Technologies Corporation | Overlays coating for superalloys |
DE3842300A1 (en) * | 1988-12-16 | 1990-06-21 | Asea Brown Boveri | Protective high-temperature layer |
RU2051196C1 (en) * | 1993-11-26 | 1995-12-27 | Совместное Российско-Итальянское предприятие "Интеркоут Турбинсервис" | Cobalt-based alloy |
WO1996012049A1 (en) * | 1994-10-14 | 1996-04-25 | Siemens Aktiengesellschaft | Protective layer for protecting parts against corrosion, oxidation and excessive thermal stresses, as well as process for producing the same |
-
1997
- 1997-07-10 IT IT97PR000039A patent/IT1294098B1/en active IP Right Grant
-
1998
- 1998-06-19 EP EP98929635A patent/EP0996752B1/en not_active Expired - Lifetime
- 1998-06-19 WO PCT/IT1998/000167 patent/WO1999002745A1/en active IP Right Grant
- 1998-06-19 DE DE69805179T patent/DE69805179T2/en not_active Expired - Lifetime
- 1998-06-19 AT AT98929635T patent/ATE217032T1/en not_active IP Right Cessation
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4585481A (en) * | 1981-08-05 | 1986-04-29 | United Technologies Corporation | Overlays coating for superalloys |
US4503122A (en) * | 1982-12-16 | 1985-03-05 | Bbc Aktiengesellschaft Brown, Boveri & Cie | High-temperature protection layer |
DE3842300A1 (en) * | 1988-12-16 | 1990-06-21 | Asea Brown Boveri | Protective high-temperature layer |
RU2051196C1 (en) * | 1993-11-26 | 1995-12-27 | Совместное Российско-Итальянское предприятие "Интеркоут Турбинсервис" | Cobalt-based alloy |
WO1996012049A1 (en) * | 1994-10-14 | 1996-04-25 | Siemens Aktiengesellschaft | Protective layer for protecting parts against corrosion, oxidation and excessive thermal stresses, as well as process for producing the same |
Non-Patent Citations (1)
Title |
---|
DATABASE WPI Section Ch Week 9640, Derwent World Patents Index; Class M26, AN 96-400681, XP002077919 * |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1589122A1 (en) * | 1999-06-08 | 2005-10-26 | Alstom Technology Ltd | Coating containing NiAl beta Phases |
EP1061150A3 (en) * | 1999-06-08 | 2000-12-27 | ABB Alstom Power (Schweiz) AG | Coating containing NiAl beta Phases |
US6471791B1 (en) | 1999-06-08 | 2002-10-29 | Alstom (Switzerland) Ltd | Coating containing NiAl-β phase |
EP1061150A2 (en) * | 1999-06-08 | 2000-12-20 | ABB Alstom Power (Schweiz) AG | Coating containing NiAl beta Phases |
EP1272301A1 (en) * | 2000-03-27 | 2003-01-08 | Sulzer Metco (US) Inc. | Superalloy hvof powders with improved high temperature oxidation, corrosion and creep resistance |
EP1272301A4 (en) * | 2000-03-27 | 2003-05-28 | Sulzer Metco Us Inc | Superalloy hvof powders with improved high temperature oxidation, corrosion and creep resistance |
EP1319730A1 (en) * | 2001-12-17 | 2003-06-18 | Mitsubishi Heavy Industries, Ltd. | High temperature corrosion resistant alloy, thermal barrier coating material with metal bonding layer, and gas turbine using high temperature corrosion resistant alloy |
US6756131B2 (en) | 2001-12-17 | 2004-06-29 | Mitsubishi Heavy Industries, Ltd. | High temperature corrosion resistant alloy, thermal barrier coating material, and gas turbine using high temperature corrosion resistant alloy |
WO2003060194A1 (en) * | 2002-01-18 | 2003-07-24 | Alstom Technology Ltd | High-temperature protective coating |
US7052782B2 (en) | 2002-01-18 | 2006-05-30 | Alstom Technology Ltd. | High-temperature protection layer |
CN100350075C (en) * | 2002-01-18 | 2007-11-21 | 阿尔斯托姆科技有限公司 | High-temperature protection layer |
EP1790746A1 (en) * | 2005-11-24 | 2007-05-30 | Siemens Aktiengesellschaft | Alloy, protective layer and component |
CN107406919A (en) * | 2015-08-25 | 2017-11-28 | 韩国机械研究院 | Machinability, inoxidizability, corrosion resistance and the outstanding Co Cr class dental alloys of taste |
CN107406919B (en) * | 2015-08-25 | 2020-05-08 | 韩国机械研究院 | Co-Cr dental alloy having excellent machinability, oxidation resistance, corrosion resistance and aesthetic properties |
Also Published As
Publication number | Publication date |
---|---|
DE69805179D1 (en) | 2002-06-06 |
ITPR970039A1 (en) | 1999-01-10 |
ATE217032T1 (en) | 2002-05-15 |
EP0996752A1 (en) | 2000-05-03 |
EP0996752B1 (en) | 2002-05-02 |
IT1294098B1 (en) | 1999-03-22 |
ITPR970039A0 (en) | 1997-07-10 |
DE69805179T2 (en) | 2002-11-14 |
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