EP0149927A1 - Herstellungsverfahren der Eisenteile einer Farbfernsehröhre - Google Patents

Herstellungsverfahren der Eisenteile einer Farbfernsehröhre Download PDF

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Publication number
EP0149927A1
EP0149927A1 EP84400153A EP84400153A EP0149927A1 EP 0149927 A1 EP0149927 A1 EP 0149927A1 EP 84400153 A EP84400153 A EP 84400153A EP 84400153 A EP84400153 A EP 84400153A EP 0149927 A1 EP0149927 A1 EP 0149927A1
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EP
European Patent Office
Prior art keywords
parts
oven
atmosphere
oxidizing
oxidation
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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
Application number
EP84400153A
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English (en)
French (fr)
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EP0149927B1 (de
Inventor
Bernard Poncet
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.)
Videocolor SA
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Videocolor SA
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Publication date
Application filed by Videocolor SA filed Critical Videocolor SA
Priority to DE8484400153T priority Critical patent/DE3478168D1/de
Publication of EP0149927A1 publication Critical patent/EP0149927A1/de
Application granted granted Critical
Publication of EP0149927B1 publication Critical patent/EP0149927B1/de
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/74—Methods of treatment in inert gas, controlled atmosphere, vacuum or pulverulent material
    • 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
    • C23C8/02—Pretreatment of the material to be coated
    • 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
    • C23C8/18—Oxidising of ferrous surfaces
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/14—Manufacture of electrodes or electrode systems of non-emitting electrodes
    • H01J9/142—Manufacture of electrodes or electrode systems of non-emitting electrodes of shadow-masks for colour television tubes

Definitions

  • the present invention relates to a method for preparing the ferrous parts of a color television tube and to an oven for carrying out such a method.
  • a first problem relating to the subject of the invention relates to the natural deposit of rust on this kind of parts during the manufacturing process. Indeed, for reasons of cost, mechanical and electrical resistance, the frame-mask assembly consists of iron which oxidizes to an oxide Fe 2 0 3 . This oxide is created on the surface of the ferrous part and gains towards the heart of the part by gnawing it. There is therefore a deterioration of the part. In addition, weakly adhering particles of rust are formed, which can detach from ferrous parts and disturb the proper functioning of the tube.
  • the tube comprises behind the already described slab a cone terminated by a glass neck which makes it possible to obtain a tube closed under vacuum.
  • the neck carries the electron guns and the magnetic deflection assembly.
  • the cone is internally lined with a magnetic shield consisting of a ferrous part which follows the shape of the cone. This ferrous part makes it possible to close the lines of the magnetic field emitted by the front of the deflection assembly (magnetic conduction) on the one hand, and on the other hand to form a black body with the mask for the various radiations.
  • the natural deposit of rust is also harmful.
  • a second problem relating to the subject of the invention relates to the natural constitution of mechanical stresses induced in metal parts. These constraints must be canceled so that the shape of each part is stable. An annealing treatment of ferrous parts is required.
  • rust is pickled by a chemical reduction when hot. Then it is known in a second step to carry out a particular oxidation. Indeed, it is known that the oxide Fe 3 O 4 , also called iron oxide II or magnetic oxide, has good qualities of magnetic conduction. It is therefore advantageous to constitute a deposit of magnetic oxide Fe 3 0 4 on the mask-frame-cone shield assembly. It should also be noted that the fineness of the masks is such that the control of reduction and oxidation must be as precise as possible.
  • the operations are carried out separately from each other in specialized ovens. There is thus an annealing and reduction furnace and an oxidation furnace.
  • An exemplary embodiment can be found in US Pat. No. 2,543,710. According to such an embodiment, one is forced to work in series of parts, which leads to blockages in the chain at the entry and exit of the treatment.
  • the present invention relates to a process for preparing ferrous parts, such as the frame, the mask or the shielding of the cone.
  • the four annealing, rust reduction, first oxidation and second oxidation operations are carried out in a single oven, so that adherent layers of iron oxide I and d are successively formed on the iron surface.
  • iron oxide II the parts to be treated continuously scrolling.
  • the invention also relates to a single oven in three sections: annealing-reduction, first and second oxidations.
  • Figure 1 shows the temperature distribution in the oven.
  • the metal parts are introduced into the furnace and advance continuously at variable speeds. Such an oven is described in Figure 2.
  • the oven has a heating body which is distributed along the axis X of the oven. On the X axis, we can determine three main sections and two airlocks. The sections are not separated by doors or airlocks. At the entrance to the oven there is an entry airlock 2.
  • the parts are introduced continuously onto a transport member, for example a conveyor belt. They then enter a first section 3, called annealing and reduction.
  • the annealing treatment makes it possible to reduce or eliminate the mechanical stresses in the parts.
  • Reduction is a chemical operation that transforms the rust formed in the open air on the ferrous parts made of pure iron.
  • first oxidation In this zone, the surface iron is transformed into iron oxide I called FeO.
  • second oxidation section 5 In this section, the oxidation operation consists in superficially transforming the layer of iron oxide I into an iron oxide II called Fe 3 0 4 .
  • the second oxidation section 5 At the end of the second oxidation section 5, one enters an exit airlock through which the prepared parts escape.
  • a temperature of approximately 760 to 780 ° is reached by temperature ramps in the example of the frames.
  • the inlet temperature of the annealing and reduction section is approximately 40 ° C., while at the outlet XI of this section it is approximately 700 ° C.
  • the temperature stabilizes at around 760 ° C.
  • a temperature down ramp begins which brings the output of the second oxidation section 5 to a temperature of approximately 500 ° C. Then the temperature decreases in the exit airlock.
  • the chemical reduction and oxidation operations are carried out by coordinating the temperature cycle described with the use of an atmosphere whose chemical constituents are dosed regularly.
  • the atmosphere used is a reducing atmosphere. That is to say that the oxidizing ratio or oxidation rate which is equal to the ratio between the number of reducing moles and the number of more reducing oxidizing moles is of value close to one.
  • such an atmosphere is obtained by a gas mixer.
  • a determination is also made of the products which are nitrogen N 2 and hydrogen H 2 , so that their relative proportions are 95 and 5 parts per cent.
  • the flow rate of the reducing atmosphere is 12.5 m 3 per hour.
  • the atmosphere used in the following sections is an oxidizing atmosphere.
  • the oxidizing ratio to a value allowing oxidation.
  • the value of this ratio is close to 0.4 (four tenths) then to 0.25 in the second oxidation section 5.
  • the reducing atmosphere composed of nitrogen and hydrogen can be obtained in particular by a gas mixer, the reducing parts of which are constantly monitored.
  • the oxidizing atmosphere is produced from such a reducing atmosphere by adding a pressure of water vapor which serves as an oxidizing body.
  • the present invention is not limited to the treatment of one or other of the metal parts included behind the panel in the television tube. Other atmospheres can be used in the same way.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)
  • Tunnel Furnaces (AREA)
EP84400153A 1982-08-20 1984-01-24 Herstellungsverfahren der Eisenteile einer Farbfernsehröhre Expired EP0149927B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE8484400153T DE3478168D1 (en) 1984-01-24 1984-01-24 Process for manufacturing the iron parts of a colour television tube

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8214436A FR2532108A1 (fr) 1982-08-20 1982-08-20 Procede de preparation des pieces ferreuses d'un tube de television en couleurs et four pour la mise en oeuvre d'un tel procede

Publications (2)

Publication Number Publication Date
EP0149927A1 true EP0149927A1 (de) 1985-07-31
EP0149927B1 EP0149927B1 (de) 1989-05-10

Family

ID=9276989

Family Applications (1)

Application Number Title Priority Date Filing Date
EP84400153A Expired EP0149927B1 (de) 1982-08-20 1984-01-24 Herstellungsverfahren der Eisenteile einer Farbfernsehröhre

Country Status (5)

Country Link
US (1) US4714497A (de)
EP (1) EP0149927B1 (de)
JP (1) JPH0742565B2 (de)
FR (1) FR2532108A1 (de)
HK (1) HK49294A (de)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271135A1 (de) * 1986-11-20 1988-06-15 Philips Patentverwaltung GmbH Verfahren zum Reinigen von Metallbauteilen für Kathodenstrahlröhren
EP0284233A1 (de) * 1987-03-07 1988-09-28 Kabushiki Kaisha Toshiba Ofenanlage zum Erzeugen einer schwärzenden Oxidschicht auf einem dünnen Metallblech und Verfahren zur Erzeugung einer schwärzenden Oxidschicht auf der Oberfläche einer Schattenmaske mit dieser Ofenanlage
FR2690167A1 (fr) * 1992-04-16 1993-10-22 Lorraine Laminage Traitement thermique de recuit de tôles en continu pour améliorer leur résistance à la corrosion.

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
US4612061A (en) * 1984-03-15 1986-09-16 Kabushiki Kaisha Toshiba Method of manufacturing picture tube shadow mask
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.
US4859251A (en) * 1987-03-07 1989-08-22 Kabushiki Kaisha Toshiba Furnace for formation of black oxide film on the surface of thin metal sheet and method for formation of black oxide film on the surface of shadow mask material by use of said furnace
JP2768389B2 (ja) * 1991-04-03 1998-06-25 中外炉工業 株式会社 Ｎｉ−Ｆｅ系製シヤドウマスクの黒化処理方法
US5292274A (en) * 1993-03-25 1994-03-08 Thomson Consumer Electronics, Inc. Method of manufacturing a color CRT to optimize the magnetic performance
DE4439440C2 (de) * 1994-11-04 1997-05-15 Nokia Deutschland Gmbh Vorrichtung zur Aufrechterhaltung eines Oxydationsprozesses
US6045628A (en) * 1996-04-30 2000-04-04 American Scientific Materials Technologies, L.P. Thin-walled monolithic metal oxide structures made from metals, and methods for manufacturing such structures
US5814164A (en) * 1994-11-09 1998-09-29 American Scientific Materials Technologies L.P. Thin-walled, monolithic iron oxide structures made from steels, and methods for manufacturing such structures
US6461562B1 (en) 1999-02-17 2002-10-08 American Scientific Materials Technologies, Lp Methods of making sintered metal oxide articles
US6277214B1 (en) 1999-07-09 2001-08-21 Powertech Labs Inc. Protective iron oxide scale on heat-treated irons and steels
EP3176436B1 (de) * 2012-02-20 2018-05-16 Panasonic Corporation Gleitelement, kältemittelverdichter mit gleitelement, kühlschrank und klimaanlage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543710A (en) * 1948-01-15 1951-02-27 Westinghouse Electric Corp Process for producing insulating iron oxide coatings
US3307981A (en) * 1963-11-14 1967-03-07 Inland Steel Co Continuous bluing and annealing process
US4285106A (en) * 1979-12-13 1981-08-25 Gte Laboratories Incorporated Method for producing color cathode ray tube aperture masks
FR2522020A1 (fr) * 1982-02-22 1983-08-26 Rca Corp Procede de noircissement de surfaces d'elements metalliques, tels que notamment masques perfores de tubes images couleur
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

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2591460A (en) * 1949-08-17 1952-04-01 Gen Electric Process for providing magnetic sheet steel with an insulative film
US3479232A (en) * 1966-09-20 1969-11-18 Exxon Research Engineering Co Passivation of metals
JPS55152182A (en) * 1979-05-14 1980-11-27 Kanto Yakin Kogyo Kk Steam treatment of iron based product

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543710A (en) * 1948-01-15 1951-02-27 Westinghouse Electric Corp Process for producing insulating iron oxide coatings
US3307981A (en) * 1963-11-14 1967-03-07 Inland Steel Co Continuous bluing and annealing process
US4285106A (en) * 1979-12-13 1981-08-25 Gte Laboratories Incorporated Method for producing color cathode ray tube aperture masks
FR2522020A1 (fr) * 1982-02-22 1983-08-26 Rca Corp Procede de noircissement de surfaces d'elements metalliques, tels que notamment masques perfores de tubes images couleur
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

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 48 (E-6)[530], page 105 E 6; & JP - A - 55 19 715 (HITACHI SEISAKUSHO K.K.) 12-02-1980 *
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 24 (C-43)[696], 13 février 1981, page 159 C 43; & JP - A - 55 152 182 (KANTOU YAKIN KOGYO K.K.) 27-11-1980 *
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 259 (E-149)[1137], 17 décembre 1982; & JP - A - 57 157 437 (HITACHI SEISAKUSHO K.K.) 29-09-1982 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0271135A1 (de) * 1986-11-20 1988-06-15 Philips Patentverwaltung GmbH Verfahren zum Reinigen von Metallbauteilen für Kathodenstrahlröhren
US4919157A (en) * 1986-11-20 1990-04-24 U.S. Philips Corporation Method of cleaning metal components for cathode ray tubes
EP0284233A1 (de) * 1987-03-07 1988-09-28 Kabushiki Kaisha Toshiba Ofenanlage zum Erzeugen einer schwärzenden Oxidschicht auf einem dünnen Metallblech und Verfahren zur Erzeugung einer schwärzenden Oxidschicht auf der Oberfläche einer Schattenmaske mit dieser Ofenanlage
FR2690167A1 (fr) * 1992-04-16 1993-10-22 Lorraine Laminage Traitement thermique de recuit de tôles en continu pour améliorer leur résistance à la corrosion.

Also Published As

Publication number Publication date
EP0149927B1 (de) 1989-05-10
US4714497A (en) 1987-12-22
HK49294A (en) 1994-05-27
FR2532108A1 (fr) 1984-02-24
FR2532108B1 (de) 1985-05-03
JPH0742565B2 (ja) 1995-05-10
JPS60174867A (ja) 1985-09-09

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