GB2241186A - Anti-sputtercoating - Google Patents

Anti-sputtercoating Download PDF

Info

Publication number
GB2241186A
GB2241186A GB9004212A GB9004212A GB2241186A GB 2241186 A GB2241186 A GB 2241186A GB 9004212 A GB9004212 A GB 9004212A GB 9004212 A GB9004212 A GB 9004212A GB 2241186 A GB2241186 A GB 2241186A
Authority
GB
United Kingdom
Prior art keywords
composition
component
paste
filler
water
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.)
Withdrawn
Application number
GB9004212A
Other versions
GB9004212D0 (en
Inventor
Norman William West
Edmund William Gaskell
Anthonty Essington Webb
Anthony Malcolm Roberts
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.)
Rolls Royce PLC
Original Assignee
Rolls Royce PLC
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
Application filed by Rolls Royce PLC filed Critical Rolls Royce PLC
Priority to GB9004212A priority Critical patent/GB2241186A/en
Publication of GB9004212D0 publication Critical patent/GB9004212D0/en
Publication of GB2241186A publication Critical patent/GB2241186A/en
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/224—Anti-weld compositions; Braze stop-off compositions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B23K26/382—Removing material by boring or cutting by boring
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/38—Removing material by boring or cutting
    • B23K26/382—Removing material by boring or cutting by boring
    • B23K26/389—Removing material by boring or cutting by boring of fluid openings, e.g. nozzles, jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/36—Removing material
    • B23K26/40—Removing material taking account of the properties of the material involved
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K2101/00—Articles made by soldering, welding or cutting
    • B23K2101/34—Coated articles, e.g. plated or painted; Surface treated articles
    • B23K2101/35—Surface treated articles

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Engineering (AREA)
  • Plasma & Fusion (AREA)
  • Laser Beam Processing (AREA)
  • Paints Or Removers (AREA)

Abstract

Unwanted sputtering of metal when a hole is being drilled by a laser beam in a metal component is avoided by coating the component with a water-soluble paste containing sodium silicate and a thixotropic filler such as bentonite. Subsequently, the paste is easily washed off with water.

Description

IMPROVEMENTS IN OR RELATING TO LASER DRILLING OF COMPONENTS This invention concerns improvements in or relating to laser drilling of components. In particular, it relates to the laser drilling of cooling holes in nozzle guide vanes, turbine blades or similar components of an aircraft gas turbine engine which are subject to extreme heat when in use.
Such vanes or blades are provided with internal channels or cavities which communicate with the outside of the vane or blade by means of a plurality of cooling holes. The cooling holes are usually located along or adjacent an external edge of the vane or blade, but may also be found on external surfaces.
In use, cooling air is passed through the channels and exits through the holes to flow over the edge or surface that is to be cooled, and thus enable the component to operate in a temperature environment that may be above the melting point of the metal of which it is made.
Each cooling hole, which typically is a fraction of a millimeter in diameter, is drilled through the metal of the vane or blade by means of a laser beam, in a manner known in the art. However, the laser beam, in drilling the hole, may cause sputtering of the metal and splashing of small quantities of molten metal over the component being drilled, especially when striking through into the internal channel. These splashes of metal may impede air flow either through the channel or over the external edge or surface, or may block some of the air cooling holes.
It is known to coat, prior to laser drilling, the interior of a cavity in a vane or blade with an adherent coating such as PTFE. Such coatings are difficult to remove subsequently and usually involve the use of hazardous chemicals in a series of operations.
It is an object of the present invention to avoid the sputtering and splashing of the metal of the component being drilled by laser in a manner that is easy and economical to operate and which presents a minimum hazard to the operator.
According to a first aspect of the present invention there is provided a method of laser drilling a component so as to avoid sputtering of the material of the component, the method comprising forming an adherent coating on a surface of the component by applying to the surface a water-soluble paste containing as its active principle sodium silicate and permitting the paste to dry, drilling through the coating and the component with a laser beam to provide a hole through or into the component, and subsequently removing the coating.
The paste preferably also contains a thixotropic filler such as bentonite.
According to a second aspect of the invention there is provided a water-soluble anti-sputtering composition for application to a surface prior to laser drilling of the surface, the composition containing as its active principle sodium silicate.
The invention will now be described by with reference to the following non-limiting examples: Example 1 An anti-sputter composition (composition "A") was prepared by mixing the following constituents, sodium silicate soln 100 parts by weight bentonite 22 parts by weight wetting agent 1 part by weight The sodium silicate solution was technical grade C112 made by Imperial Chemical Industries Plc and consisted of a 48.5% w/w solution of sodium silicate in water.
The bentonite (hydrated aluminium silicate) originate form Wyoming in Canada and was of grade -200 mesh to dust.
The wetting agent was Synperonic N made by Imperial Chemical Industries Plc and consists of a 25% w/w aqueous solution of a non-ionic surfactant.
Example 2 An anti-sputter composition (composition "B") was prepared by mixing the following constituents, sodium silicate soln 100 parts by weight bentonite 104 parts by weight wetting agent 1 part by weight.
The constituents were of the same substance and qualify as in Example 1.
Example 3 An anti-sputter composition (composition "C") was prepared by mixing the following constituents, sodium silicate soln 100 parts by weight bentonite 104 parts by weight wetting agent 1 part by weight.
The constituents were of the same substance and quality as in Example 1.
In experiments each anti-sputter composition A, B, C was applied in turn to a respective aircraft metal turbine vane by pasting, and allowed to dry. Holes were then laser drilled in each vane through its anti-sputter composition coating. The coatings were then washed off with pressurised jets of hot water, which process was carried out easily.
On inspection of the vanes it was seen that there was minimal sputtering of the metal surrounding the laser drilled holes.
Interior cavities of components may be similarly coated prior to laser drillng, but in these cases it may be necessary to dilute the anti-sputtering paste with water.
Composition ranges extending outside those exemplified may be used within the scope of the invention.
The examples show that the composition of the invention is easily applied to a component before laser drilling, and is equally easily removed after drilling by the application of pressurized hot water.
The composition of the invention further has low toxicity and cost, is nonflammable, and gives low contamination of the final product.

Claims (15)

1 A method of laser drilling a component so as to avoid sputtering of the material of the component, the method comprising forming an adherent coating on a surface of the component by applying to the surface a water-soluble paste containing as its active principle sodium silicate and permitting the paste to dry, drilling through the coating and the component with a laser beam to provide a hole through or into the component, and subsequently removing the coating.
2 A method as claimed in claim 1 wherein the paste contains a thixotropic filler.
3 A method as claimed in claim 2 wherein the paste contains 15 - 55% by weight of filler.
4 A method as claimed in claim 2 wherein the filler is bentonite.
5 A method as claimed in claim 1 wherein the paste contains a wetting agent.
6 A method as claimed in claim 1 wherein the subsequent removal of the coating is by means of the application of water.
7 A method as claimed in claim 1 wherein the material of the component is a metal.
8 A water-soluble anti-sputtering composition for application to a surface prior to laser drilling of the surface, the composition containing as its active principle sodium silicate.
9 A composition as claimed in claim 8 wherein the composition is in the form of a paste when applied.
10 A composition as claimed in claim 8 wherein the composition contains a thixotropic filler.
11 A composition as claimed in claim 10 wherein the filler is 15 - 55% by weight of the composition.
12 A composition as claimed in claim 10 wherein the filler is bentonite.
13 A composition as claimed in claim 8 including a wetting agent.
14 A method of laser drilling a component so as to avoid sputtering of the material of the component substantially as hereinbefore described with reference to the examples.
15 A water-soluble anti-sputtering composition for application to a surface prior to laser drilling of the surface substantially as hereinbefore described with reference to the examples.
GB9004212A 1990-02-24 1990-02-24 Anti-sputtercoating Withdrawn GB2241186A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9004212A GB2241186A (en) 1990-02-24 1990-02-24 Anti-sputtercoating

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9004212A GB2241186A (en) 1990-02-24 1990-02-24 Anti-sputtercoating

Publications (2)

Publication Number Publication Date
GB9004212D0 GB9004212D0 (en) 1990-04-18
GB2241186A true GB2241186A (en) 1991-08-28

Family

ID=10671580

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9004212A Withdrawn GB2241186A (en) 1990-02-24 1990-02-24 Anti-sputtercoating

Country Status (1)

Country Link
GB (1) GB2241186A (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0761448A2 (en) * 1995-08-28 1997-03-12 Lexmark International, Inc. Method of forming an inkjet printhead nozzle structure
US5914060A (en) * 1998-09-29 1999-06-22 United Technologies Corporation Method of laser drilling an airfoil
US5928534A (en) * 1998-09-29 1999-07-27 United Technologies Corporation Method for reducing void volumes in cavities for laser drilling
US6120131A (en) * 1995-08-28 2000-09-19 Lexmark International, Inc. Method of forming an inkjet printhead nozzle structure
US6139303A (en) * 1998-11-20 2000-10-31 United Technologies Corporation Fixture for disposing a laser blocking material in an airfoil
US6177038B1 (en) 1998-11-20 2001-01-23 United Technologies Corporation Method for orienting an airfoil for processing and for forming a mask for the airfoil
US6224361B1 (en) 1998-11-20 2001-05-01 United Technologies Corportion Tool for disposing laser blocking material in an airfoil
US6251315B1 (en) * 1998-11-20 2001-06-26 United Technologies Corporation Method for disposing a laser blocking material on the interior of an airfoil
US6323456B1 (en) 1995-08-28 2001-11-27 Lexmark International, Inc. Method of forming an ink jet printhead structure
US6329633B1 (en) * 1998-11-20 2001-12-11 United Technologies Corporation Method and material for processing a component for laser machining
EP1226947A1 (en) * 2001-01-30 2002-07-31 Hewlett-Packard Company Thin film coating of a slotted substrate and techniques for forming slotted substrates
US8232205B2 (en) 2009-08-25 2012-07-31 Corning Incorporated Methods of manufacturing a honeycomb extrusion die

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1370253A (en) * 1972-04-20 1974-10-16 Rolls Royce Method of brazing
GB1394463A (en) * 1972-06-21 1975-05-14 Rolls Royce Method of protecting a surface

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1370253A (en) * 1972-04-20 1974-10-16 Rolls Royce Method of brazing
GB1394463A (en) * 1972-06-21 1975-05-14 Rolls Royce Method of protecting a surface

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6120131A (en) * 1995-08-28 2000-09-19 Lexmark International, Inc. Method of forming an inkjet printhead nozzle structure
EP0761448A3 (en) * 1995-08-28 1997-10-22 Lexmark Int Inc Method of forming an inkjet printhead nozzle structure
US6323456B1 (en) 1995-08-28 2001-11-27 Lexmark International, Inc. Method of forming an ink jet printhead structure
EP0761448A2 (en) * 1995-08-28 1997-03-12 Lexmark International, Inc. Method of forming an inkjet printhead nozzle structure
US5928534A (en) * 1998-09-29 1999-07-27 United Technologies Corporation Method for reducing void volumes in cavities for laser drilling
US5914060A (en) * 1998-09-29 1999-06-22 United Technologies Corporation Method of laser drilling an airfoil
US6139303A (en) * 1998-11-20 2000-10-31 United Technologies Corporation Fixture for disposing a laser blocking material in an airfoil
US6177038B1 (en) 1998-11-20 2001-01-23 United Technologies Corporation Method for orienting an airfoil for processing and for forming a mask for the airfoil
US6224361B1 (en) 1998-11-20 2001-05-01 United Technologies Corportion Tool for disposing laser blocking material in an airfoil
US6251315B1 (en) * 1998-11-20 2001-06-26 United Technologies Corporation Method for disposing a laser blocking material on the interior of an airfoil
US6329633B1 (en) * 1998-11-20 2001-12-11 United Technologies Corporation Method and material for processing a component for laser machining
EP1226947A1 (en) * 2001-01-30 2002-07-31 Hewlett-Packard Company Thin film coating of a slotted substrate and techniques for forming slotted substrates
US6648732B2 (en) 2001-01-30 2003-11-18 Hewlett-Packard Development Company, L.P. Thin film coating of a slotted substrate and techniques for forming slotted substrates
EP2000309A3 (en) * 2001-01-30 2009-12-16 Hewlett-Packard Company Thin film coating of a slotted substrate and techniques for forming slotted substrates
US8232205B2 (en) 2009-08-25 2012-07-31 Corning Incorporated Methods of manufacturing a honeycomb extrusion die

Also Published As

Publication number Publication date
GB9004212D0 (en) 1990-04-18

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WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)