US20080011035A1 - Method of forging a titanium alloy - Google Patents
Method of forging a titanium alloy Download PDFInfo
- Publication number
- US20080011035A1 US20080011035A1 US11/176,382 US17638205A US2008011035A1 US 20080011035 A1 US20080011035 A1 US 20080011035A1 US 17638205 A US17638205 A US 17638205A US 2008011035 A1 US2008011035 A1 US 2008011035A1
- Authority
- US
- United States
- Prior art keywords
- coating
- titanium alloy
- forging
- vanadium
- protective coating
- 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.)
- Granted
Links
Images
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
- C23C10/00—Solid state diffusion of only metal elements or silicon into metallic material surfaces
- C23C10/60—After-treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
-
- 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
- C23C10/18—Solid state diffusion of only metal elements or silicon into metallic material surfaces using liquids, e.g. salt baths, liquid suspensions
-
- 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
- the present invention relates to a method of forging a titanium alloy and in particular to a method of forging titanium alloys with high levels of vanadium.
- alloys are coated with a high temperature borosilicate glass lubricant coating and are then forged at a high temperature.
- liquid and vapour metal oxide e.g. vanadium pentoxide
- borosilicate glass lubricant produces decohesion or decomposition of the borosilicate glass which produces an unacceptable forging process and makes the surface quality of forged high vanadium and chromium titanium alloy unsatisfactory.
- the present invention seeks to provide a novel method of forging a titanium alloy, which reduces or overcomes the above-mentioned problem.
- the present invention provides a method of forging a titanium alloy comprising applying a protective coating onto the titanium alloy, applying a glass lubricant coating onto the protective coating and forging the titanium alloy at a high temperature.
- the glass lubricant coating comprises a borosilicate glass lubricant coating.
- Preferably applying the protective coating comprises applying an aluminide coating, a silicon modified aluminide coating, a platinum aluminide coating, an aluminium coating or a platinum coating.
- Preferably applying the protective coating comprises pack aluminising, vapour phase aluminising, slurry aluminising, spraying, heat-treating or plating.
- the titanium alloy consists of vanadium and chromium.
- the titanium alloy consists of 20 wt % to 40 wt % vanadium and 10 to 20 wt % chromium.
- the titanium alloy consists of 20 wt % to 30 wt % vanadium, 13 wt % to 17 wt % chromium, 1.0 wt % to 3.0 wt % aluminium, 0.1 wt % to 0.4 wt % carbon and up to 0.2 wt % oxygen and balance titanium and incidental impurities.
- the titanium alloy consists of 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminium, up to 0.15 wt % oxygen, 0.1 wt % to 0.3 wt % carbon and the balance titanium plus incidental impurities.
- the titanium alloy consists of 35 wt % vanadium and 15 wt % chromium.
- the titanium alloy is forged into a compressor blade or a compressor vane.
- FIG. 1 shows a titanium alloy component with a protective coating to be used in a method of forging according to the present invention.
- a method of forging a titanium alloy component 10 comprises applying a protective coating 14 onto the surface 12 of the titanium alloy component 10 .
- a glass lubricant coating 16 is applied onto the protective coating 14 and then the titanium alloy component 10 is forged at a high temperature, for example about 1050° C.
- the titanium alloy component 10 comprises a titanium alloy consisting of vanadium and chromium and other elements, for example a titanium alloy consisting of 20 wt % to 40 wt % vanadium and 10 to 20 wt % chromium.
- the titanium alloy preferably consisting of 20 wt % to 30 wt % vanadium, 13 wt % to 17 wt % chromium, 1.0 wt % to 3.0 wt % aluminium, 0.1 wt % to 0.4 wt % carbon and up to 0.2 wt % oxygen and balance titanium and incidental impurities.
- a particular titanium alloy consists of 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminium, up to 0.15 wt % oxygen, 0.1 wt % to 0.3 wt % carbon and the balance titanium plus incidental impurities.
- Another particular titanium alloy consists of 35 wt % vanadium and 15 wt % chromium.
- a suitable glass lubricant coating comprises a borosilicate glass lubricant coating.
- the preferred protective coating comprises an aluminide coating, a silicon modified aluminide coating, a platinum aluminide coating, an aluminium coating or a platinum coating.
- the protective coating is applied by pack aluminising, vapour phase aluminising, slurry aluminising, spraying, heat-treating or plating.
- One particular protective coating is a silicon-modified aluminide produced by slurry aluminising.
- Such protective coatings are available as IPAL IP1041 from Indestructible Paints Ltd of 23-25 Pentos Drive, Sparkhill, Birmingham, B11 3TA or Sermaloy J (RTM) from Sermatech (UK) Ltd of High Holborn Road, Codnor Gate Business Park, Ripley, DE5 3NW.
- Another particular protective coating is an aluminium water base inorganic acid coating is sprayed onto the titanium alloy component and then cured at a temperature of 540° C. to 560° C.
- Such protective coatings are available as IPCOTE IP9183, or IPCOTE IP9183R1, from Indestructible Paints Ltd of 23-25 Pentos Drive, Sparkhill, Birmingham, B11 3TA or Sermetal W from Sermatech (UK) Ltd of High Holborn Road, Codnor Gate Business Park, Ripley, DE5 3NW.
- the protective coating of an aluminide coating is produced by aluminising and the platinum aluminide coating is produced by platinum aluminising.
- Such protective coatings are available as CN32/1 or CN32/2 and as CN22 or CN22LT from Chromalloy (UK) Ltd of Bramble Way, Clover Nook Industrial Estate, Somercotes, Alfreton, Derbsyshire, DE55 4RH.
- the protective coating 12 prevents the formation of metal oxides, e.g. vanadium pentoxide, under the glass lubricant coating 14 and hence the glass lubricant coating 14 is not decomposed during the forging process and thus the forging process produces an acceptable surface quality of the forged titanium alloy component 10 .
- metal oxides e.g. vanadium pentoxide
- the titanium alloy components may for example be compressor blades, or compressor vanes, of a high-pressure compressor of a gas turbine engine.
- the present invention is also applicable to titanium alloys consisting of about 15 wt % vanadium.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Forging (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
Description
- The present invention relates to a method of forging a titanium alloy and in particular to a method of forging titanium alloys with high levels of vanadium.
- Conventionally alloys are coated with a high temperature borosilicate glass lubricant coating and are then forged at a high temperature.
- It has been found that the high temperature borosilicate glass lubricant decomposes on the surface of titanium alloys with high levels of vanadium and chromium and this makes the surface quality of forged high vanadium and chromium titanium alloys unsatisfactory.
- It has been found that liquid and vapour metal oxide, e.g. vanadium pentoxide, formed underneath the borosilicate glass lubricant produces decohesion or decomposition of the borosilicate glass which produces an unacceptable forging process and makes the surface quality of forged high vanadium and chromium titanium alloy unsatisfactory.
- Accordingly the present invention seeks to provide a novel method of forging a titanium alloy, which reduces or overcomes the above-mentioned problem.
- Accordingly the present invention provides a method of forging a titanium alloy comprising applying a protective coating onto the titanium alloy, applying a glass lubricant coating onto the protective coating and forging the titanium alloy at a high temperature.
- Preferably the glass lubricant coating comprises a borosilicate glass lubricant coating.
- Preferably applying the protective coating comprises applying an aluminide coating, a silicon modified aluminide coating, a platinum aluminide coating, an aluminium coating or a platinum coating.
- Preferably applying the protective coating comprises pack aluminising, vapour phase aluminising, slurry aluminising, spraying, heat-treating or plating.
- Preferably the titanium alloy consists of vanadium and chromium.
- Preferably the titanium alloy consists of 20 wt % to 40 wt % vanadium and 10 to 20 wt % chromium.
- Preferably the titanium alloy consists of 20 wt % to 30 wt % vanadium, 13 wt % to 17 wt % chromium, 1.0 wt % to 3.0 wt % aluminium, 0.1 wt % to 0.4 wt % carbon and up to 0.2 wt % oxygen and balance titanium and incidental impurities.
- Preferably the titanium alloy consists of 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminium, up to 0.15 wt % oxygen, 0.1 wt % to 0.3 wt % carbon and the balance titanium plus incidental impurities.
- Preferably the titanium alloy consists of 35 wt % vanadium and 15 wt % chromium.
- Preferably the titanium alloy is forged into a compressor blade or a compressor vane.
- The present invention will be more fully described by way of example with reference to the accompanying drawings in which:
-
FIG. 1 shows a titanium alloy component with a protective coating to be used in a method of forging according to the present invention. - A method of forging a
titanium alloy component 10 comprises applying aprotective coating 14 onto thesurface 12 of thetitanium alloy component 10. Aglass lubricant coating 16 is applied onto theprotective coating 14 and then thetitanium alloy component 10 is forged at a high temperature, for example about 1050° C. - The
titanium alloy component 10 comprises a titanium alloy consisting of vanadium and chromium and other elements, for example a titanium alloy consisting of 20 wt % to 40 wt % vanadium and 10 to 20 wt % chromium. The titanium alloy preferably consisting of 20 wt % to 30 wt % vanadium, 13 wt % to 17 wt % chromium, 1.0 wt % to 3.0 wt % aluminium, 0.1 wt % to 0.4 wt % carbon and up to 0.2 wt % oxygen and balance titanium and incidental impurities. A particular titanium alloy consists of 25 wt % vanadium, 15 wt % chromium, 2 wt % aluminium, up to 0.15 wt % oxygen, 0.1 wt % to 0.3 wt % carbon and the balance titanium plus incidental impurities. Another particular titanium alloy consists of 35 wt % vanadium and 15 wt % chromium. - A suitable glass lubricant coating comprises a borosilicate glass lubricant coating.
- The preferred protective coating comprises an aluminide coating, a silicon modified aluminide coating, a platinum aluminide coating, an aluminium coating or a platinum coating. The protective coating is applied by pack aluminising, vapour phase aluminising, slurry aluminising, spraying, heat-treating or plating.
- One particular protective coating is a silicon-modified aluminide produced by slurry aluminising. Such protective coatings are available as IPAL IP1041 from Indestructible Paints Ltd of 23-25 Pentos Drive, Sparkhill, Birmingham, B11 3TA or Sermaloy J (RTM) from Sermatech (UK) Ltd of High Holborn Road, Codnor Gate Business Park, Ripley, DE5 3NW.
- Another particular protective coating is an aluminium water base inorganic acid coating is sprayed onto the titanium alloy component and then cured at a temperature of 540° C. to 560° C. Such protective coatings are available as IPCOTE IP9183, or IPCOTE IP9183R1, from Indestructible Paints Ltd of 23-25 Pentos Drive, Sparkhill, Birmingham, B11 3TA or Sermetal W from Sermatech (UK) Ltd of High Holborn Road, Codnor Gate Business Park, Ripley, DE5 3NW.
- The protective coating of an aluminide coating is produced by aluminising and the platinum aluminide coating is produced by platinum aluminising. Such protective coatings are available as CN32/1 or CN32/2 and as CN22 or CN22LT from Chromalloy (UK) Ltd of Bramble Way, Clover Nook Industrial Estate, Somercotes, Alfreton, Derbsyshire, DE55 4RH.
- In use the
protective coating 12 prevents the formation of metal oxides, e.g. vanadium pentoxide, under theglass lubricant coating 14 and hence theglass lubricant coating 14 is not decomposed during the forging process and thus the forging process produces an acceptable surface quality of the forgedtitanium alloy component 10. - Other suitable protective coatings may be used.
- The titanium alloy components may for example be compressor blades, or compressor vanes, of a high-pressure compressor of a gas turbine engine.
- The present invention is also applicable to titanium alloys consisting of about 15 wt % vanadium.
Claims (13)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB0416764.9A GB0416764D0 (en) | 2004-07-28 | 2004-07-28 | A method of forging a titanium alloy |
GB0416764.9 | 2004-07-28 |
Publications (2)
Publication Number | Publication Date |
---|---|
US20080011035A1 true US20080011035A1 (en) | 2008-01-17 |
US7320238B1 US7320238B1 (en) | 2008-01-22 |
Family
ID=32947532
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/176,382 Expired - Fee Related US7320238B1 (en) | 2004-07-28 | 2005-07-08 | Method of forging a titanium alloy |
Country Status (4)
Country | Link |
---|---|
US (1) | US7320238B1 (en) |
EP (1) | EP1624084B1 (en) |
DE (1) | DE602005000087T2 (en) |
GB (1) | GB0416764D0 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9909200B2 (en) | 2014-09-29 | 2018-03-06 | Hitachi Metals, Ltd. | Method of manufacturing Ni-base superalloy |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102007060254A1 (en) | 2007-12-14 | 2009-06-18 | Deutsches Zentrum für Luft- und Raumfahrt e.V. | Platinum-based high-temperature protective coating on aluminum-rich titanium alloys and titanium aluminides |
EP2703454A1 (en) * | 2012-08-29 | 2014-03-05 | Pemco Brugge BVBA | Coating compositions |
CN112496215B (en) * | 2020-11-16 | 2023-06-23 | 遵义航天新力精密铸锻有限公司 | Forging method of titanium alloy thin-wall component |
Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2903785A (en) * | 1957-02-11 | 1959-09-15 | Gen Motors Corp | Method of hot working titanium |
US4055975A (en) * | 1977-04-01 | 1977-11-01 | Lockheed Aircraft Corporation | Precision forging of titanium |
US4183236A (en) * | 1978-01-30 | 1980-01-15 | Trw Inc. | Method of isothermal forging |
US4318792A (en) * | 1980-07-07 | 1982-03-09 | Trw Inc. | Process for depositing forging lubricant on titanium workpiece |
US4595473A (en) * | 1984-08-28 | 1986-06-17 | Trw Inc. | Forging lubricant |
US5300159A (en) * | 1987-12-23 | 1994-04-05 | Mcdonnell Douglas Corporation | Method for manufacturing superplastic forming/diffusion bonding tools from titanium |
US5743121A (en) * | 1996-05-31 | 1998-04-28 | General Electric Company | Reducible glass lubricants for metalworking |
Family Cites Families (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB812819A (en) | 1955-05-20 | 1959-04-29 | Nat Res Dev | Improvements in and relating to the extrusion or other high pressure flow-working oftitanium |
GB814569A (en) | 1956-04-25 | 1959-06-10 | Comptoir Ind Etirage | Extrusion of metals or alloys |
FR2321351A1 (en) * | 1975-07-30 | 1977-03-18 | Quichaud Daniel | Precision forged bolts of steel or titanium alloys - where accurately turned blanks are hot forged to exact dimensions |
SU1162541A1 (en) * | 1983-03-02 | 1985-06-23 | Предприятие П/Я Р-6189 | Method of producing parts ,particularly, of convex shape |
JPS62133054A (en) | 1985-12-06 | 1987-06-16 | Nippon Steel Metal Prod Co Ltd | Antioxidant for heat treatment of titanium |
JPS62286637A (en) * | 1986-06-03 | 1987-12-12 | Japan Casting & Forging Corp | Hot forging method for titanium alloy ingot |
JPH02104435A (en) * | 1988-10-11 | 1990-04-17 | Mitsubishi Steel Mfg Co Ltd | Lubricating method for hot-forming titanium alloy |
FR2691705B1 (en) * | 1992-05-29 | 1994-08-19 | Fix International | Liquid composition for forming a self-baked glassy material, self-baked glassy material and a part provided with a coating made of such a material. |
FR2961705A1 (en) | 2010-06-23 | 2011-12-30 | Commissariat Energie Atomique | Automatic fire extinguisher for alkaline metal battery in e.g. electric bicycle, has releasing device provided with explosive load that is exploded in response to detection of departure of fire or preliminary anomaly operation of battery |
-
2004
- 2004-07-28 GB GBGB0416764.9A patent/GB0416764D0/en not_active Ceased
-
2005
- 2005-07-06 EP EP05254222A patent/EP1624084B1/en not_active Expired - Fee Related
- 2005-07-06 DE DE602005000087T patent/DE602005000087T2/en active Active
- 2005-07-08 US US11/176,382 patent/US7320238B1/en not_active Expired - Fee Related
Patent Citations (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2903785A (en) * | 1957-02-11 | 1959-09-15 | Gen Motors Corp | Method of hot working titanium |
US4055975A (en) * | 1977-04-01 | 1977-11-01 | Lockheed Aircraft Corporation | Precision forging of titanium |
US4183236A (en) * | 1978-01-30 | 1980-01-15 | Trw Inc. | Method of isothermal forging |
US4318792A (en) * | 1980-07-07 | 1982-03-09 | Trw Inc. | Process for depositing forging lubricant on titanium workpiece |
US4595473A (en) * | 1984-08-28 | 1986-06-17 | Trw Inc. | Forging lubricant |
US5300159A (en) * | 1987-12-23 | 1994-04-05 | Mcdonnell Douglas Corporation | Method for manufacturing superplastic forming/diffusion bonding tools from titanium |
US5743121A (en) * | 1996-05-31 | 1998-04-28 | General Electric Company | Reducible glass lubricants for metalworking |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US9909200B2 (en) | 2014-09-29 | 2018-03-06 | Hitachi Metals, Ltd. | Method of manufacturing Ni-base superalloy |
Also Published As
Publication number | Publication date |
---|---|
EP1624084B1 (en) | 2006-08-23 |
DE602005000087D1 (en) | 2006-10-05 |
GB0416764D0 (en) | 2004-09-01 |
DE602005000087T2 (en) | 2007-01-11 |
US7320238B1 (en) | 2008-01-22 |
EP1624084A1 (en) | 2006-02-08 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US4005989A (en) | Coated superalloy article | |
US8475598B2 (en) | Strip process for superalloys | |
JP3027005B2 (en) | Method for re-polishing corroded superalloy or heat-resistant steel member and re-polished member | |
US6440499B1 (en) | Method for producing a slip layer which is resistant to corrosion and oxidation | |
EP1652965A1 (en) | Method for applying chromium-containing coating to metal substrate and coated article thereof | |
EP2022868A2 (en) | Method for forming platinum aluminide diffusion coatings | |
JP2001295021A (en) | Method for depositing protective film on metallic substrate and article obtained thereby | |
JPH04228583A (en) | Steel commodity having double protective coating and its manufacture | |
US20100151125A1 (en) | Slurry chromizing process | |
US7320238B1 (en) | Method of forging a titanium alloy | |
US20080066288A1 (en) | Method for applying a high temperature anti-fretting wear coating | |
EP2417276A2 (en) | Slurry composition for aluminising a superalloy component | |
JPH08501831A (en) | Protection of chrome steel substrates against corrosion and erosion at temperatures up to about 500 ° C | |
US8039116B2 (en) | Nb-Si based alloys having an Al-containing coating, articles, and processes | |
CN101802246A (en) | Method of treating surface of Ti-Al alloy and Ti-Al alloy obtained by the same | |
JP2012007236A (en) | Oxidation resistant component and related method | |
US6843861B2 (en) | Method for preventing the formation of secondary reaction zone in susceptible articles, and articles prepared by the method | |
US20060057416A1 (en) | Article having a surface protected by a silicon-containing diffusion coating | |
JP2934599B2 (en) | High temperature corrosion resistant composite surface treatment method | |
US20160184890A1 (en) | Chromide coatings, articles coated with chromide coatings, and processes for forming chromide coatings | |
JPH0525934B2 (en) | ||
US8714233B2 (en) | Casting process, materials and apparatus, and castings produced therewith | |
EP1939326A2 (en) | Process for preventing the formation of secondary reaction zone in susceptible articles, and articles manufactured using same | |
JP2706328B2 (en) | Heat treatment method for corrosion and oxidation resistant coating for Ni-base super heat resistant alloy |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: ROLLS-ROYCE PLC, GREAT BRITAIN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VOICE, WAYNE ERIC;REEL/FRAME:016766/0169 Effective date: 20050603 |
|
FEPP | Fee payment procedure |
Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FEPP | Fee payment procedure |
Free format text: PAYER NUMBER DE-ASSIGNED (ORIGINAL EVENT CODE: RMPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY |
|
FPAY | Fee payment |
Year of fee payment: 4 |
|
REMI | Maintenance fee reminder mailed | ||
LAPS | Lapse for failure to pay maintenance fees | ||
STCH | Information on status: patent discontinuation |
Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362 |
|
FP | Lapsed due to failure to pay maintenance fee |
Effective date: 20160122 |