EP0048083B1 - Surface treatment method of heat-resistant alloy - Google Patents
Surface treatment method of heat-resistant alloy Download PDFInfo
- Publication number
- EP0048083B1 EP0048083B1 EP19810303264 EP81303264A EP0048083B1 EP 0048083 B1 EP0048083 B1 EP 0048083B1 EP 19810303264 EP19810303264 EP 19810303264 EP 81303264 A EP81303264 A EP 81303264A EP 0048083 B1 EP0048083 B1 EP 0048083B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- heat
- alloy
- resistant alloy
- surface treatment
- treatment method
- 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
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
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
-
- 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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/28—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes
- C23C10/30—Solid state diffusion of only metal elements or silicon into metallic material surfaces using solids, e.g. powders, pastes using a layer of powder or paste on the surface
Definitions
- This invention relates to a method of surface treatment of a member of heat-resistant alloy for use in turbines, blowers, boilers or the like to render it resistant to high temperature oxidation as well as to high temperature corrosion.
- the present invention is directed to-providing a method which overcomes the deficiencies of these previous methods.
- a method of applying a protective coating to a heat resistant alloy part of a kind having at least at its surface an inhomogeneous morphology which involves depositing a first coating of Ni with some Cr (namely 5-15% by weight Cr) for example, it is suggested, by plasma spraying to form a first layer, and then depositing a second coating for example, it is suggested, by slurry aluminising to form a second, aluminised, layer, and thereafter heat treating the part, whereby, it is said, the aluminised layer is caused to diffuse completely through the first layer and into the base material.
- the present invention provides a surface treatment method of a heat-resistant alloy comprising the steps of plasma spraying a Ni-Cr alloy on to the surface of a member made of heat-resistant alloy, applying thereon a coating slurry containing aluminium particles and then heat treating the coated member for diffusion penetration which is characterised in that the Ni-Cr alloy comprises 50Ni-50Cr alloy and in that the coating slurry contains additionally Si0 2 particles.
- the surface treatment method of the present invention provides the characterizing features as illustrated in Table 1 in comparison with some conventional methods.
- a substrate of Udimet 520 (Registered Trade Mark) comprising by weight 19% Cr, 12% Co, 6% Mo, 3% Ti, 2% Al, 1% Fe, Ni-Bal, and widely used as a super-alloy for the hot parts of a gas turbine, was treated in the following sequence: -
- step (4) could be carried out using a mixture of AI with Si0 2 in a mixing ratio by weight of 80/20 or 50/50.
- step (6) could be carried out using a vacuum furnace in place of the hydrogen furnace.
- Udimet 520 has been treated by the method of the invention by way of example, similar excellent results can also be obtained when treating the surfaces of other substrates such Ni-based alloy, Co-based alloy and stainless steel.
- the coated surface of the substrate provided by the above described method had an extremely smooth and flat surface and AI and Si from the second layer sufficiently penetrated by diffusion into the first layer, thereby completely eliminating the fine pores of the first layer.
- the composite coating was rendered wholly homogeneous.
- AI since the melting point of AI is 660°C, AI was fused due to the heat-treatment and penetrated into the fine pores, thus presumably rendering the surface smooth and flat. Further, it was confirmed that a part of AI and Si reached and was diffused also into the substrate.
- Table 2 illustrates the results of fly-ash errosion resistance test, corrosion resistance test, and practical application test using gas turbine blades, each test being applied to a member treated by a method in accordance with the present invention and a member treated-by a conventional method.
- the composite coating produced by the method in accordance with the present invention had a better performance in comparison with that produced by the conventional method in the fly-ash errosion resistance test and the corrsion resistance test.
- the coated blade produced using the method of the present invention exhibited the tendency that the deposition amount of the fuel ash become smaller.
- the composite coating produced by the method of the present invention did not suffer peeling or cracking and had extremely good adhesion.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Coating By Spraying Or Casting (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
- Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
- This invention relates to a method of surface treatment of a member of heat-resistant alloy for use in turbines, blowers, boilers or the like to render it resistant to high temperature oxidation as well as to high temperature corrosion.
- In industrial gas turbines using petroleum or natural gas as the fuel, gas temperature at the turbine inlet tends to become higher as the turbine efficiency is improved. On the other hand, as the available fuel supply has changed for the worse in recent years, the fuels used for the turbines have been diversified and the content of corrosive impurities in the fuels such as sulphur (S), sodium (Na), vanadium (V), and so forth has tended to increase. As a result, so-called "hot parts" such as the blades and burners of turbines, that are exposed to these high temperature gases, are subjected to extremely severe high temperature oxidation as well as high temperature corrosion.
- These hot parts have conventionally been made primarily of heat-resistant alloys. In particular turbine blades consist of Ni- and Co-based alloys called "super-alloys". However, since high temperature strength is generally a top priority requirement for these super-alloys, they have the drawback that their corrosion resistance and oxidation resistance are not satisfactory. Various attempts have therefore been made to provide these heat-resistant alloys with oxidation resistance and corrosion resistance and various surface treatment methods using for example chemical and physical techniques have been employed. However, none of these methods has been really satisfactory as regards efficiency and cost.
- The present invention is directed to-providing a method which overcomes the deficiencies of these previous methods.
- In GB-A-2009251 there is disclosed a method of applying a protective coating to a heat resistant alloy part of a kind having at least at its surface an inhomogeneous morphology which involves depositing a first coating of Ni with some Cr (namely 5-15% by weight Cr) for example, it is suggested, by plasma spraying to form a first layer, and then depositing a second coating for example, it is suggested, by slurry aluminising to form a second, aluminised, layer, and thereafter heat treating the part, whereby, it is said, the aluminised layer is caused to diffuse completely through the first layer and into the base material.
- In order to provide a member of heat-resistant alloy with high temperature oxidation resistance and high temperature corrosion resistance, the present invention provides a surface treatment method of a heat-resistant alloy comprising the steps of plasma spraying a Ni-Cr alloy on to the surface of a member made of heat-resistant alloy, applying thereon a coating slurry containing aluminium particles and then heat treating the coated member for diffusion penetration which is characterised in that the Ni-Cr alloy comprises 50Ni-50Cr alloy and in that the coating slurry contains additionally Si02 particles.
- The surface treatment method of the present invention provides the characterizing features as illustrated in Table 1 in comparison with some conventional methods.
- The present invention will now be described in more detail by reference to an example in accordance therewith.
- A substrate of Udimet 520 (Registered Trade Mark) comprising by weight 19% Cr, 12% Co, 6% Mo, 3% Ti, 2% Al, 1% Fe, Ni-Bal, and widely used as a super-alloy for the hot parts of a gas turbine, was treated in the following sequence: -
- (1) After the surface of the substrate had been cleaned with an alkaline emulsion cleaning agent, steam cleaning was carried out using a Fluron type solvent. The surface was further blasted using an Al2O3 blast.
- 2. A Ni-Cr (50/50 by weight) alloy was applied as a coating to form a first layer having a thickness of about 50 pm by plasma spraying.
- (3) The surface of the sprayed-on first layer was blasted using Al2O3 to remove any oxide film formed on its outermost surface.
- (4) The surface of the sprayed-on first layer was coated by spraying on a coating slurry formed by dispersing AI and Si02, each having a particle size of about 0.1 to 1 pm, in an organic carrier (alcohol, solvent naphtha, etc.) to form a second layer.
- (5) After these treatments, the substrate was placed in an electric furnace and was held at 80°C (±5°C) for 20 minutes to evaporate and remove the liquid. After being further held at 330°C (±5°C) for 15 minutes, the substrate was withdrawn from the furnace.
- (6) The substrate was held at 1,080°C for 4 hours inside a hydrogen furnace, was cooled in the furnace and was then withdrawn.
- Above mentioned step (4) could be carried out using a mixture of AI with Si02 in a mixing ratio by weight of 80/20 or 50/50. Also step (6) could be carried out using a vacuum furnace in place of the hydrogen furnace.
- Although in this example Udimet 520 has been treated by the method of the invention by way of example, similar excellent results can also be obtained when treating the surfaces of other substrates such Ni-based alloy, Co-based alloy and stainless steel.
- The coated surface of the substrate provided by the above described method had an extremely smooth and flat surface and AI and Si from the second layer sufficiently penetrated by diffusion into the first layer, thereby completely eliminating the fine pores of the first layer. Hence, the composite coating was rendered wholly homogeneous. In other words, since the melting point of AI is 660°C, AI was fused due to the heat-treatment and penetrated into the fine pores, thus presumably rendering the surface smooth and flat. Further, it was confirmed that a part of AI and Si reached and was diffused also into the substrate.
- Table 2 illustrates the results of fly-ash errosion resistance test, corrosion resistance test, and practical application test using gas turbine blades, each test being applied to a member treated by a method in accordance with the present invention and a member treated-by a conventional method. The composite coating produced by the method in accordance with the present invention had a better performance in comparison with that produced by the conventional method in the fly-ash errosion resistance test and the corrsion resistance test. In the practical application test using gas turbine blades, too, the coated blade produced using the method of the present invention exhibited the tendency that the deposition amount of the fuel ash become smaller. In a thermal inpact test comprising holding the testpiece at 1,100°C for 15 minutes, then charging it into the water at 20°C and repeating these procedures five times, the composite coating produced by the method of the present invention did not suffer peeling or cracking and had extremely good adhesion.
Claims (4)
1. A surface treatment method of a heat-resistant alloy comprising the steps of plasma spraying a Ni-Cr alloy on to the surface of a member made of heat resistant alloy, applying thereon a coating slurry containing aluminium particles and then heat treating said coated member for diffusion penetration, characterised in that the Ni-Cr alloy comprises 50Ni-50Cr alloy and in that the coating slurry additionally contains Si02 particles.
2. A method according to Claim 1, characterised in that said aluminium and Si02 particles have a particle size of about 0.1 µm to 1 pm.
3. A method according to Claim 1 or Claim 2, characterised in that the heat treatment includes the step of holding the coated member at about 1080°C.
4. A method according to Claim 3, wherein said step in the heat treatment is preceded by a heating step to evaporate the liquid in the slurry, followed by a heat treatment at about 330°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP128738/80 | 1980-09-17 | ||
| JP12873880A JPS5754282A (en) | 1980-09-17 | 1980-09-17 | Surface treatment of heat resistant alloy |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0048083A1 EP0048083A1 (en) | 1982-03-24 |
| EP0048083B1 true EP0048083B1 (en) | 1986-03-05 |
Family
ID=14992227
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP19810303264 Expired EP0048083B1 (en) | 1980-09-17 | 1981-07-16 | Surface treatment method of heat-resistant alloy |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0048083B1 (en) |
| JP (1) | JPS5754282A (en) |
| CA (1) | CA1173305A (en) |
| DE (1) | DE3173970D1 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58177458A (en) * | 1982-04-12 | 1983-10-18 | Sumitomo Metal Ind Ltd | Cementation method of nickel-chromium alloy |
| JPS63487A (en) * | 1986-06-19 | 1988-01-05 | Tookaro Kk | Heat resistance member having oxide film on coating of chromium-contained thermal spraying metal |
| US5789077A (en) | 1994-06-27 | 1998-08-04 | Ebara Corporation | Method of forming carbide-base composite coatings, the composite coatings formed by that method, and members having thermally sprayed chromium carbide coatings |
| DE19824792B4 (en) * | 1998-06-03 | 2005-06-30 | Mtu Aero Engines Gmbh | Method for producing an adhesive layer for a thermal barrier coating |
| US6294261B1 (en) * | 1999-10-01 | 2001-09-25 | General Electric Company | Method for smoothing the surface of a protective coating |
| WO2006065819A2 (en) * | 2004-12-13 | 2006-06-22 | Aeromet Technologies, Inc. | Metal components with silicon-containing protective coatings and methods of forming such protective coatings |
| US20060057418A1 (en) | 2004-09-16 | 2006-03-16 | Aeromet Technologies, Inc. | Alluminide coatings containing silicon and yttrium for superalloys and method of forming such coatings |
| US9133718B2 (en) | 2004-12-13 | 2015-09-15 | Mt Coatings, Llc | Turbine engine components with non-aluminide silicon-containing and chromium-containing protective coatings and methods of forming such non-aluminide protective coatings |
| CN109868447B (en) * | 2017-12-01 | 2022-03-25 | 通用电气公司 | Method for reducing surface roughness |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3837894A (en) * | 1972-05-22 | 1974-09-24 | Union Carbide Corp | Process for producing a corrosion resistant duplex coating |
| CA1004964A (en) * | 1972-05-30 | 1977-02-08 | Union Carbide Corporation | Corrosion resistant coatings and process for making the same |
| JPS5635749B2 (en) * | 1973-01-23 | 1981-08-19 | ||
| US3989863A (en) * | 1975-07-09 | 1976-11-02 | The International Nickel Company, Inc. | Slurry coating process |
| GB2009251B (en) * | 1977-12-01 | 1982-08-18 | Rolls Royce | Coated metal part and the method of applying coating |
-
1980
- 1980-09-17 JP JP12873880A patent/JPS5754282A/en active Granted
-
1981
- 1981-07-16 EP EP19810303264 patent/EP0048083B1/en not_active Expired
- 1981-07-16 DE DE8181303264T patent/DE3173970D1/en not_active Expired
- 1981-08-07 CA CA000383402A patent/CA1173305A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0132309B2 (en) | 1989-06-30 |
| EP0048083A1 (en) | 1982-03-24 |
| DE3173970D1 (en) | 1986-04-10 |
| JPS5754282A (en) | 1982-03-31 |
| CA1173305A (en) | 1984-08-28 |
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