EP0271135B1 - Verfahren zum Reinigen von Metallbauteilen für Kathodenstrahlröhren - Google Patents

Verfahren zum Reinigen von Metallbauteilen für Kathodenstrahlröhren Download PDF

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Publication number
EP0271135B1
EP0271135B1 EP87202251A EP87202251A EP0271135B1 EP 0271135 B1 EP0271135 B1 EP 0271135B1 EP 87202251 A EP87202251 A EP 87202251A EP 87202251 A EP87202251 A EP 87202251A EP 0271135 B1 EP0271135 B1 EP 0271135B1
Authority
EP
European Patent Office
Prior art keywords
furnace
metal elements
metal components
cathode ray
minutes
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 - Lifetime
Application number
EP87202251A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0271135A1 (de
Inventor
Emil Mateias
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.)
Koninklijke Philips NV
Original Assignee
Philips Patentverwaltung GmbH
Philips Gloeilampenfabrieken NV
Koninklijke Philips Electronics NV
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 Philips Patentverwaltung GmbH, Philips Gloeilampenfabrieken NV, Koninklijke Philips Electronics NV filed Critical Philips Patentverwaltung GmbH
Priority to AT87202251T priority Critical patent/ATE85090T1/de
Publication of EP0271135A1 publication Critical patent/EP0271135A1/de
Application granted granted Critical
Publication of EP0271135B1 publication Critical patent/EP0271135B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
    • C23C8/08—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases only one element being applied
    • C23C8/10—Oxidising
    • C23C8/16—Oxidising using oxygen-containing compounds, e.g. water, carbon dioxide
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/45—Scale remover or preventor

Definitions

  • the invention relates to a method for cleaning metal components for cathode ray tubes.
  • Such components e.g. Hole masks, mask frames and inner cones for color picture tubes are usually degreased by washing with halogenated hydrocarbons. These degreasing agents are harmful to the environment. There is also the risk that chlorine and carbon-containing residues remain on the components.
  • the invention has for its object to provide a more environmentally friendly cleaning method that not only ensures complete degreasing, but also the required purity with respect to other contaminants.
  • This object is achieved in that the metal components for 5 to 45 minutes, in particular 10 to 25 minutes in a continuous furnace to a temperature of 500 ° C to 800 ° C in a from 92 to 96% by volume nitrogen, 4 to 8 Vol.% Hydrogen existing atmosphere are heated, wherein in a heating phase a, an evaporation of oil from the surface of the metal components, in a middle phase b by water vapor introduced at a dew point of 25 ° C to -10 ° C, a weak oxidation of the surface and finally in phase C after the end temperature has been reached a reduction in the oxidized surface is brought about.
  • the process according to the invention has the advantage that it is simple, reproducible, harmless and environmentally friendly. A number of treatment and transport steps are omitted, so that the risk of damage to the metal components is reduced.
  • the method according to the invention not only is the oil on the surface of the metal components evaporated, but also any residues of organic material remaining on the metal surface are reduced.
  • the components treated according to the invention are suitable for high-vacuum use.
  • the method according to the invention has the advantage that no combustion residues remain on the metal surface.
  • thermal degreasing has a positive effect on the physical-mechanical properties, e.g. on magnetism. This also applies to high-alloy materials, e.g. INVAR steels, the surface of which is contaminated with substances that are particularly difficult to remove. Thermal degreasing is also cheaper than chemical degreasing.
  • Process steps b and c were carried out in an oxygen-free atmosphere of 94% by volume nitrogen and 6% by volume hydrogen.
  • the dew point of the moisture was approximately 25 ° C. in process step b and a maximum of 0 ° C. in process step c.
  • the temperature / time curve in the treatment of shadow masks and diaphragm parts is shown by a curve made of dashed lines, INVAR masks and shielding cones by a curve made of solid lines.
  • the device shown in Fig. 2 consists of a continuous furnace 1, which is structurally connected to a blackening furnace 2.
  • the continuous furnace can be heated with electric radiators 3.
  • a gas mixture of 94% by volume nitrogen and 6% by volume hydrogen is passed through furnace 1 via a gas line 4.
  • a corresponding amount of moisture is passed into the furnace 1 via a water vapor line 5.
  • Chimneys 6 and 7 with shut-off elements 8 and 9 are used to set the pressure and flow rate in furnace 1.
  • the oil-containing exhaust gas stream is either burned in a burner 10 or fed to the gas burners of the blackening furnace 2 via a line 11.
  • the furnace 1 is heated to an operating temperature which is 530 to 580 ° C. for shadow masks and mask frames or mask diaphragms, 750 to 800 ° C. for masks made of INVAR steel and 700 to 750 ° C. for inner cones.
  • the metal components corresponding to these temperatures are then passed through the furnace 1, which is indicated by an arrow 12.
  • the residence time of the components in furnace 1 is of the order of 25 minutes.
  • the components are then, as indicated by an arrow 13, passed through the blackening furnace 2, which is equipped with gas discharge lines 14 and 15 with shut-off members 16 and 17 and with gas burners 18.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning In General (AREA)
EP87202251A 1986-11-20 1987-11-18 Verfahren zum Reinigen von Metallbauteilen für Kathodenstrahlröhren Expired - Lifetime EP0271135B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87202251T ATE85090T1 (de) 1986-11-20 1987-11-18 Verfahren zum reinigen von metallbauteilen fuer kathodenstrahlroehren.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863639657 DE3639657A1 (de) 1986-11-20 1986-11-20 Verfahren zum reinigen von metallbauteilen fuer kathodenstrahlroehren
DE3639657 1986-11-20

Publications (2)

Publication Number Publication Date
EP0271135A1 EP0271135A1 (de) 1988-06-15
EP0271135B1 true EP0271135B1 (de) 1993-01-27

Family

ID=6314364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87202251A Expired - Lifetime EP0271135B1 (de) 1986-11-20 1987-11-18 Verfahren zum Reinigen von Metallbauteilen für Kathodenstrahlröhren

Country Status (5)

Country Link
US (1) US4919157A (ja)
EP (1) EP0271135B1 (ja)
JP (1) JP2716707B2 (ja)
AT (1) ATE85090T1 (ja)
DE (2) DE3639657A1 (ja)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3843158A1 (de) * 1988-12-22 1990-06-28 Felten & Guilleaume Energie Verfahren und vorrichtung zur reinigung und/oder entschichtung von halogenkohlenwasserstoffhaltigen rueckstaenden auf metallischen oberflaechen mittels umweltfreundlicher behandlungsmittel
DE3923685A1 (de) * 1989-07-18 1991-01-24 Rheydt Kabelwerk Ag Verfahren zum reinigen von gegenstaenden
JPH05222448A (ja) * 1992-02-10 1993-08-31 Kawasaki Steel Corp 冷延鋼帯の製造方法
DE59300400D1 (de) * 1992-04-06 1995-08-31 Ebg Elektromagnet Werkstoffe Verfahren und Vorrichtung zur Reinigung von Metallbandoberflächen durch Gasspülung in wasserstoffreichen Atmosphären.
DE4240387A1 (de) * 1992-12-01 1994-06-09 Linde Ag Abtrennen organischer Verunreinigungen, insbesondere Öle, von Gegenständen wie Abfallprodukten
US6004180A (en) * 1997-09-30 1999-12-21 Candescent Technologies Corporation Cleaning of electron-emissive elements
DE19840778A1 (de) * 1998-09-07 2000-03-09 Messer Griesheim Gmbh Verfahren und Vorrichtung zur Reinigung von Metalloberflächen
US6357453B1 (en) * 2001-06-04 2002-03-19 Sony Corporation System and method for cleaning cathode ray tube funnels prior to application of interior coating
US6873097B2 (en) * 2001-06-28 2005-03-29 Candescent Technologies Corporation Cleaning of cathode-ray tube display
DE10161880A1 (de) * 2001-12-17 2003-07-03 Elino Ind Ofenbau Carl Hanf & Verfahren und Vorrichtung zum Entfernen von Anhaftungen, insbesondere öl- bzw. fettartigen Anhaftungen, die sich auf der Oberfläche von Metallteilen befinden

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3307981A (en) * 1963-11-14 1967-03-07 Inland Steel Co Continuous bluing and annealing process
JPS50102533A (ja) * 1974-01-16 1975-08-13
JPS535969A (en) * 1976-07-06 1978-01-19 Nippon Intaanashiyonaru Seiriy Method of manufacturing semiconductor rectifer element
JPS56126231A (en) * 1980-03-10 1981-10-03 Mitsubishi Electric Corp Production of a high pressure metal steam dischrge lamp
JPS582588A (ja) * 1981-06-29 1983-01-08 中濃窯業株式会社 窯業用焼成炉のシ−ル装置
JPS5859529A (ja) * 1981-10-05 1983-04-08 Toshiba Corp 陰極構体の製造方法
FR2522020B1 (fr) * 1982-02-22 1985-12-20 Rca Corp Procede de noircissement de surfaces d'elements metalliques, tels que notamment masques perfores de tubes images couleur
JPS5919195A (ja) * 1982-07-26 1984-01-31 Shin Nisso Kako Co Ltd 感熱記録材料
FR2532108A1 (fr) * 1982-08-20 1984-02-24 Videocolor Sa Procede de preparation des pieces ferreuses d'un tube de television en couleurs et four pour la mise en oeuvre d'un tel procede
DE3580055D1 (de) * 1984-04-05 1990-11-15 Stein Heurtey Entfettungsverfahren fuer kaltgewalztes stahlband.
JPS61147900A (ja) * 1984-12-20 1986-07-05 Hitachi Ltd 鋼帯の連続めっき設備
NL8600141A (nl) * 1986-01-23 1987-08-17 Philips Nv Werkwijze voor het vervaardigen van een schaduwmasker, schaduwmasker vervaardigd volgens zulk een werkwijze en kleurenbeeldbuis voorzien van zulk een schaduwmasker.

Also Published As

Publication number Publication date
DE3783884D1 (de) 1993-03-11
JP2716707B2 (ja) 1998-02-18
US4919157A (en) 1990-04-24
JPS63137186A (ja) 1988-06-09
DE3639657A1 (de) 1988-06-01
ATE85090T1 (de) 1993-02-15
EP0271135A1 (de) 1988-06-15

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