GB2169496A - Cleaning metal surfaces - Google Patents
Cleaning metal surfaces Download PDFInfo
- Publication number
- GB2169496A GB2169496A GB08501028A GB8501028A GB2169496A GB 2169496 A GB2169496 A GB 2169496A GB 08501028 A GB08501028 A GB 08501028A GB 8501028 A GB8501028 A GB 8501028A GB 2169496 A GB2169496 A GB 2169496A
- Authority
- GB
- United Kingdom
- Prior art keywords
- laser
- metal surface
- contact
- contaminant
- cleaning
- 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
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
- C23G—CLEANING OR DE-GREASING OF METALLIC MATERIAL BY CHEMICAL METHODS OTHER THAN ELECTROLYSIS
- C23G5/00—Cleaning or de-greasing metallic material by other methods; Apparatus for cleaning or de-greasing metallic material with organic solvents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B7/00—Cleaning by methods not provided for in a single other subclass or a single group in this subclass
- B08B7/0035—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like
- B08B7/0042—Cleaning by methods not provided for in a single other subclass or a single group in this subclass by radiant energy, e.g. UV, laser, light beam or the like by laser
Abstract
A reflective metal surface, e.g. an electrical contact surface, is cleaned by exposing the surface to pulsed laser radiation. The progress of the evaporation can be monitored by examination of the emission spectrum of the transient plasma produced by each laser pulse. An apparatus for carrying out the process is also described.
Description
SPECIFICATION
Cleaning metal surfaces
This invention relates to electrical contacts, and in particular to a method and apparatus for removing 'contaminant deposits from such contacts.
Electrical contacts, e.g. for use in switches or relays, are frequently contaminated with organic and inorganic materials during manufacture. The presence of this contamination on the contact surface can resuit in carbonisation and/ortarnishing during subsequent use. This in turn can lead to a number of contact faults, particularly on unacceptably high contact resistance.
Various methods have been proposed for cleaning contacts prior to use in high reliability applications.
Typically the contacts are treated with a solvent which removes soluble organic residues. However such treatment is not fully effective as polymeric and/or inorganic materials may still adhere to the contact surface.
The object of the present invention is to minimise or to overcome this disadvantage.
According to one aspect of the invention there is provided a method of cleaning a reflective metal surface, the method including exposing the surface to pulsed coherent radiation of sufficient intensity to vapourise contaminant materials adherent to the metal surface.
According to another aspect of the invention there is provided an apparatus for removing contaminant materials from a reflective metal surface, the apparatus including a pulsed laser, meansforfocussing the laser output on to the metal surface, spectroscopic means for detecting non-metallic elements in the material evaporated from the metal surface by the laser beam, and feedback means for disabling the laser when said non metallic elements are absent from the evaporated material.
An embodiment ofthe invention will now be described with reference to the accompanying drawing in which the single figure is a schematic diagram of a contact cleaning apparatus.
Referring to the drawing, the contact cleaning apparatus includes an ultraviolet laser 11 of the pulsed type driven buy a power supply 12 and provided with a converging optical system 13, e.g. a lens, whereby the laser output may be focussed on to the surface of a contact 14. Typically we employ a krypton fluoride gas laser having a wavelength of 249 nm for this purpose, but it will be apparentthatthe technique is not limited to this particular laser system. The constraints on the laser are that it should provide a sufficient energy densityto effectvaporisation and that it should have a wavelength at which the contaminant materials are absorbent.We have found that a surface energy density of 0.1 J/cm2 to 0.8 J/cm2 is sufficient to provide vaporisation of surface deposits. As the metal surface is reflective there is substantially no depletion of the contact material.
Advantageously the evaporation process may be monitored to establish the pointatwhich removal of contaminant material is complete. After each laser pulse a transient incandescent plasma is produced at the evaporation site. The emission spectrum of this plasma is of course characteristicofthose elements present. Lightfrom the plasma is received by a photodetector 1 4via a filter 15 whose passband corresponds to the emission lines ofthe non-metallic contaminant elements, e.g. carbon and/orsulphur.
The photodetector output is coupled via amplifier 16 to a control circuit 17 which circuitdisablesthe laser when the characteristic emission lines are no longer present, i.e. when all the contaminant material has been depleted. The contact 14 is then removed for further processing.
Although the technique has been described in relation to electrical contacts it will be appreciated that it is not so limited and that it can be applied to other reflective metal surfaces. In particularthe technique can be used with advantage forthe treatment of connector contacts and PCB edge contacts.
1. A method of cleaning a reflective metal surface, the method including exposing the surface to pulsed coherent radiation of sufficient intensity to vapourise contaminant materials adherentto the metal surface.
2. A method as claimed in claim 1 wherein said radiation is provided by an ultraviolet laser.
3. A method as claimed in claim 2, wherein said laser is a krypton fluoride laser.
4. Amethodofcleaninga reflectivemetalsurface substantially as described herein with reference to the accompanying drawings.
5. A method as claimed in claim 1,2 or 3, wherein the laser provides a surface energy density of 0.1 to 0.8
J/cm2.
6. An appparatusforremoving contaminant materialsfrom a reflective metal surface, the apparatus including a pulsed laser, meansforfocussingthe laser output on to the metal surface, spectroscopic means for detecting non-metallic elements in the material evaporated from the metal surfacebythelaserbeam, and feedback means for disabling the laser when said non metallic elements are absentfrom the evaporated material.
7. An apparatus as claimed in claim 6, wherein said laser is an ultraviolet laser.
8. An apparatus as claimed in claim 7, wherein said laser is a krypton fluoride laser.
9. An apparatus for cleaning a reflective metal surface substantially as described herein with reference to the accompanying drawings.
10. An electrical contact treated by a method as claimed in any one of claims 1 to 5.
11. A printed circuit board treated by.a method as claimed in any one of claims 1 to 5.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (11)
1. A method of cleaning a reflective metal surface, the method including exposing the surface to pulsed coherent radiation of sufficient intensity to vapourise contaminant materials adherentto the metal surface.
2. A method as claimed in claim 1 wherein said radiation is provided by an ultraviolet laser.
3. A method as claimed in claim 2, wherein said laser is a krypton fluoride laser.
4. Amethodofcleaninga reflectivemetalsurface substantially as described herein with reference to the accompanying drawings.
5. A method as claimed in claim 1,2 or 3, wherein the laser provides a surface energy density of 0.1 to 0.8
J/cm2.
6. An appparatusforremoving contaminant materialsfrom a reflective metal surface, the apparatus including a pulsed laser, meansforfocussingthe laser output on to the metal surface, spectroscopic means for detecting non-metallic elements in the material evaporated from the metal surfacebythelaserbeam, and feedback means for disabling the laser when said non metallic elements are absentfrom the evaporated material.
7. An apparatus as claimed in claim 6, wherein said laser is an ultraviolet laser.
8. An apparatus as claimed in claim 7, wherein said laser is a krypton fluoride laser.
9. An apparatus for cleaning a reflective metal surface substantially as described herein with reference to the accompanying drawings.
10. An electrical contact treated by a method as claimed in any one of claims 1 to 5.
11. A printed circuit board treated by.a method as claimed in any one of claims 1 to 5.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08501028A GB2169496B (en) | 1985-01-16 | 1985-01-16 | Cleaning metal surfaces |
DE19863600591 DE3600591A1 (en) | 1985-01-16 | 1986-01-11 | METHOD AND DEVICE FOR REMOVING IMPURITIES FROM THE SURFACE OF METALS BY LASER RADIATION AND SURFACE TREATED IN THIS TREATMENT |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB08501028A GB2169496B (en) | 1985-01-16 | 1985-01-16 | Cleaning metal surfaces |
Publications (3)
Publication Number | Publication Date |
---|---|
GB8501028D0 GB8501028D0 (en) | 1985-02-20 |
GB2169496A true GB2169496A (en) | 1986-07-16 |
GB2169496B GB2169496B (en) | 1987-12-23 |
Family
ID=10572914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB08501028A Expired GB2169496B (en) | 1985-01-16 | 1985-01-16 | Cleaning metal surfaces |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE3600591A1 (en) |
GB (1) | GB2169496B (en) |
Cited By (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2641550A1 (en) * | 1988-09-23 | 1990-07-13 | Mo Textilny I Imen | PROCESS FOR CLEANING FIBROUS MATERIALS COMPRISING REMOVAL OF VEGETABLE IMPURITIES AND DEVICE FOR CARRYING OUT SAID METHOD |
EP0461843A2 (en) * | 1990-06-11 | 1991-12-18 | Agency Of Industrial Science And Technology | Methods of modifying metallic surfaces |
US5151135A (en) * | 1989-09-15 | 1992-09-29 | Amoco Corporation | Method for cleaning surfaces using UV lasers |
WO1995011764A1 (en) * | 1993-10-26 | 1995-05-04 | Saint Gobain Emballage | Method and device for cleaning solid elements |
US5626778A (en) * | 1995-04-28 | 1997-05-06 | International Business Machines Corporation | Multi-wavelength programmable laser processing mechanisms and apparatus utilizing spectrometer verification |
GB2316528A (en) * | 1996-08-14 | 1998-02-25 | Commissariat Energie Atomique | Process for cleaning or decontaminating an object by means of an ultraviolet laser beam together with apparatus for implementing the process |
EP0905762A1 (en) * | 1997-09-30 | 1999-03-31 | STMicroelectronics S.r.l. | Method for removing moulding residues in the fabrication of plastic packages for semiconductor devices |
US5928533A (en) * | 1996-03-01 | 1999-07-27 | Pirelli Coordinamento Pneumatici S.P.A. | Method and apparatus for cleaning vulcanization molds for elastomer material articles |
NL1016334C2 (en) * | 2000-10-05 | 2002-04-08 | Boschman Tech Bv | A laser cutting method for a composite integrated circuit structure includes measuring the radiation emitted during cutting with a light-sensitive element and adjusting the power of the laser when a material transition is detected |
WO2002029853A2 (en) * | 2000-10-05 | 2002-04-11 | Boschman Technologies B.V. | Method for cutting a composite structure comprising one or more electronic compnents using a laser |
EP1342510A2 (en) * | 2002-03-09 | 2003-09-10 | MTU Aero Engines GmbH | Process for stripping of engine elements and device for process execution |
WO2004019020A1 (en) * | 2002-08-22 | 2004-03-04 | The Secretary Of State For Defence | Method and apparatus for stand-off chemical detection |
DE10313521A1 (en) * | 2002-12-18 | 2004-07-08 | Geringer, Michael | Arrangement for removing burrs from components in lead frames has image processing system with camera(s) for detecting component orientation/position, controlling laser beam along edge to be deburred |
EP2666555A1 (en) * | 2012-05-22 | 2013-11-27 | Unison Industries LLC | Method of preparing material for welding |
GB2582574A (en) * | 2019-03-25 | 2020-09-30 | Eaton Intelligent Power Ltd | Improved method of manufacturing a contact arrangement for a switching device with low contact resistance |
Families Citing this family (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0355096B1 (en) * | 1987-04-01 | 1992-03-25 | STIWA-Fertigungstechnik Sticht Gesellschaft m.b.H | Process and device for removing coatings with a laser beam |
DE3721940A1 (en) * | 1987-07-02 | 1989-01-12 | Ibm Deutschland | REMOVAL OF PARTICLES FROM SURFACES OF SOLID BODY BY LASER Bombardment |
EP0329787A4 (en) * | 1987-08-28 | 1990-09-05 | Tsentralnoe Konstruktorskoe Bjuro Unikalnogo Priborostroenia Akademii Nauk Ssr | Method and device for laser processing of an object |
DE3932328A1 (en) * | 1989-09-28 | 1991-04-11 | Opel Adam Ag | METHOD FOR MACHINING SURFACES HIGHLY STRESSED BY FRICTION IN INTERNAL COMBUSTION ENGINES, AND DEVICE FOR CARRYING OUT THE METHOD |
DE4142855A1 (en) * | 1991-12-20 | 1993-07-01 | Electronicon Gmbh I L | Preferentially etching metal coatings on plastic or paper foil - using pulsed laser beam operating in ultraviolet range |
DE4241575A1 (en) * | 1992-12-10 | 1994-06-16 | Baldwin Gegenheimer Gmbh | Printing roller cleaning - uses laser beam to detach dirt and residue from surface without affecting surface character |
DE4301410A1 (en) * | 1993-01-20 | 1994-07-21 | Baldwin Gegenheimer Gmbh | Printing machine cleaning device |
DE4320408C2 (en) * | 1993-06-21 | 1998-02-19 | Fraunhofer Ges Forschung | Process control and regulation process for the surface processing of workpieces with pulsed laser radiation |
DE19617388C1 (en) * | 1996-04-30 | 1997-05-28 | Siemens Ag | Laser machining process monitoring system |
DE10130402A1 (en) * | 2001-06-23 | 2003-01-02 | Bayerische Motoren Werke Ag | Pre-treatment monitoring procedures |
DE10222117B4 (en) * | 2002-05-17 | 2004-09-16 | W&H Dentalwerk Bürmoos Gesellschaft m.b.H. | Dental medical laser processing device for plasma-induced ablation |
CH698238B1 (en) * | 2005-07-07 | 2009-06-30 | Main Man Inspiration Ag | Device for the continuous surface cleaning a rotatable casting rolls of a strip-casting machine. |
CN103792215B (en) * | 2014-01-24 | 2016-08-17 | 国电科学技术研究院 | A kind of method of carbon element content in quick measurement iron and steel |
CN106881311B (en) * | 2017-03-29 | 2019-04-23 | 中国人民解放军装甲兵工程学院 | A kind of underwater metal surface dirt laser cleaning water proof equipment and its application |
CN109821822A (en) * | 2019-03-13 | 2019-05-31 | 何兴 | Netted laser cleaning system and method |
CN109967458B (en) * | 2019-04-08 | 2022-03-01 | 哈尔滨工业大学 | Laser cleaning, decontaminating and antifouling method for fouling of marine microorganisms |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1127715A (en) * | 1966-04-27 | 1968-09-18 | Hellmut Schneider | Method and apparatus for producing sonic or ultrasonic energy or heat at surfaces |
GB1585609A (en) * | 1976-10-07 | 1981-03-11 | Lasag G | Method of removing material from a workpiece |
GB2061164A (en) * | 1979-10-25 | 1981-05-13 | Langen R | Method of and apparatus for removing rust |
EP0091646A1 (en) * | 1982-04-14 | 1983-10-19 | Westinghouse Electric Corporation | Laser decontamination method |
GB2118028A (en) * | 1982-04-05 | 1983-10-26 | Maxwell Lab | Decontaminating surfaces |
-
1985
- 1985-01-16 GB GB08501028A patent/GB2169496B/en not_active Expired
-
1986
- 1986-01-11 DE DE19863600591 patent/DE3600591A1/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1127715A (en) * | 1966-04-27 | 1968-09-18 | Hellmut Schneider | Method and apparatus for producing sonic or ultrasonic energy or heat at surfaces |
GB1585609A (en) * | 1976-10-07 | 1981-03-11 | Lasag G | Method of removing material from a workpiece |
GB2061164A (en) * | 1979-10-25 | 1981-05-13 | Langen R | Method of and apparatus for removing rust |
GB2118028A (en) * | 1982-04-05 | 1983-10-26 | Maxwell Lab | Decontaminating surfaces |
EP0091646A1 (en) * | 1982-04-14 | 1983-10-19 | Westinghouse Electric Corporation | Laser decontamination method |
Non-Patent Citations (2)
Title |
---|
POPULAR SCIENCE, JULY 1982, P82-84 * |
WO 83/01400 * |
Cited By (26)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2641550A1 (en) * | 1988-09-23 | 1990-07-13 | Mo Textilny I Imen | PROCESS FOR CLEANING FIBROUS MATERIALS COMPRISING REMOVAL OF VEGETABLE IMPURITIES AND DEVICE FOR CARRYING OUT SAID METHOD |
US5151135A (en) * | 1989-09-15 | 1992-09-29 | Amoco Corporation | Method for cleaning surfaces using UV lasers |
EP0461843A2 (en) * | 1990-06-11 | 1991-12-18 | Agency Of Industrial Science And Technology | Methods of modifying metallic surfaces |
EP0461843A3 (en) * | 1990-06-11 | 1993-03-17 | Agency Of Industrial Science And Technology | Methods of modifying metallic surfaces |
WO1995011764A1 (en) * | 1993-10-26 | 1995-05-04 | Saint Gobain Emballage | Method and device for cleaning solid elements |
FR2711557A1 (en) * | 1993-10-26 | 1995-05-05 | Saint Gobain Emballage | Method and device for cleaning solid elements |
US5643367A (en) * | 1993-10-26 | 1997-07-01 | Saint Gobain Emballage | Method and device for cleaning solid elements |
US5626778A (en) * | 1995-04-28 | 1997-05-06 | International Business Machines Corporation | Multi-wavelength programmable laser processing mechanisms and apparatus utilizing spectrometer verification |
US6113707A (en) * | 1996-03-01 | 2000-09-05 | Pirelli Coordinamento Pneumatici Spa | Method and apparatus for cleaning vulcanization molds for elastomer material articles |
US5928533A (en) * | 1996-03-01 | 1999-07-27 | Pirelli Coordinamento Pneumatici S.P.A. | Method and apparatus for cleaning vulcanization molds for elastomer material articles |
GB2316528B (en) * | 1996-08-14 | 2000-07-12 | Commissariat Energie Atomique | Process for cleaning or decontaminating an object an object by means of an ultraviolet laser beam together with apparatus for implementing the process |
GB2316528A (en) * | 1996-08-14 | 1998-02-25 | Commissariat Energie Atomique | Process for cleaning or decontaminating an object by means of an ultraviolet laser beam together with apparatus for implementing the process |
EP0905762A1 (en) * | 1997-09-30 | 1999-03-31 | STMicroelectronics S.r.l. | Method for removing moulding residues in the fabrication of plastic packages for semiconductor devices |
US6468356B1 (en) | 1997-09-30 | 2002-10-22 | Stmicroelectronics S.R.L. | Method for removing molding residues in the fabrication of plastic packages for semiconductor devices |
NL1016334C2 (en) * | 2000-10-05 | 2002-04-08 | Boschman Tech Bv | A laser cutting method for a composite integrated circuit structure includes measuring the radiation emitted during cutting with a light-sensitive element and adjusting the power of the laser when a material transition is detected |
WO2002029853A2 (en) * | 2000-10-05 | 2002-04-11 | Boschman Technologies B.V. | Method for cutting a composite structure comprising one or more electronic compnents using a laser |
WO2002029853A3 (en) * | 2000-10-05 | 2002-08-08 | Boschman Tech Bv | Method for cutting a composite structure comprising one or more electronic compnents using a laser |
EP1342510A2 (en) * | 2002-03-09 | 2003-09-10 | MTU Aero Engines GmbH | Process for stripping of engine elements and device for process execution |
EP1342510A3 (en) * | 2002-03-09 | 2005-06-22 | MTU Aero Engines GmbH | Process for stripping of engine elements and device for process execution |
WO2004019020A1 (en) * | 2002-08-22 | 2004-03-04 | The Secretary Of State For Defence | Method and apparatus for stand-off chemical detection |
US7298475B2 (en) | 2002-08-22 | 2007-11-20 | The Secretary Of State For Defence | Method and apparatus for stand-off chemical detection |
DE10313521A1 (en) * | 2002-12-18 | 2004-07-08 | Geringer, Michael | Arrangement for removing burrs from components in lead frames has image processing system with camera(s) for detecting component orientation/position, controlling laser beam along edge to be deburred |
DE10313521B4 (en) * | 2002-12-18 | 2006-05-11 | Geringer, Michael | Device and method for removing the injection burr on housing sides of arranged in a leadframe components |
EP2666555A1 (en) * | 2012-05-22 | 2013-11-27 | Unison Industries LLC | Method of preparing material for welding |
US8859935B2 (en) | 2012-05-22 | 2014-10-14 | General Electric Company | Method of preparing material for welding |
GB2582574A (en) * | 2019-03-25 | 2020-09-30 | Eaton Intelligent Power Ltd | Improved method of manufacturing a contact arrangement for a switching device with low contact resistance |
Also Published As
Publication number | Publication date |
---|---|
DE3600591A1 (en) | 1986-07-17 |
GB2169496B (en) | 1987-12-23 |
GB8501028D0 (en) | 1985-02-20 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PCNP | Patent ceased through non-payment of renewal fee |