EP0149927B1 - Herstellungsverfahren der Eisenteile einer Farbfernsehröhre - Google Patents

Herstellungsverfahren der Eisenteile einer Farbfernsehröhre Download PDF

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Publication number
EP0149927B1
EP0149927B1 EP84400153A EP84400153A EP0149927B1 EP 0149927 B1 EP0149927 B1 EP 0149927B1 EP 84400153 A EP84400153 A EP 84400153A EP 84400153 A EP84400153 A EP 84400153A EP 0149927 B1 EP0149927 B1 EP 0149927B1
Authority
EP
European Patent Office
Prior art keywords
oxidizing
atmosphere
oxidation
iron
iron oxide
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
Application number
EP84400153A
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English (en)
French (fr)
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EP0149927A1 (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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Filing date
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 process for preparing the ferrous parts of a color television tube.
  • 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 is constituted by 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 thus 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 0 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 subject of the present invention is a process for the preparation of iron parts to be placed inside a color television tube making it possible, in a single enclosure, to rapidly carry out and parade this preparation with a view to eliminating any rust and give these parts good mechanical and magnetic qualities.
  • FIG 1 shows the temperature distribution in the oven.
  • Metal parts are introduced into the oven 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 rust formed in the open air on ferrous parts into pure iron.
  • first oxidation In this zone, the surface iron is transformed into iron oxide 1 called FeO.
  • second oxidation section 5 At the end of this section 4 we enter a second oxidation section 5.
  • the oxidation operation consists in superficially transforming the iron oxide layer 1 into an iron oxide It says 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 ° C. 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 X1 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 around 500 ° C. Then the temperature decreases in the exit airlock.
  • Such preparation of the ferrous parts makes it possible to obtain very homogeneous oxide layers and good adhesion to the surface iron. Indeed, one passes from an oxidation state 0 to an oxidation state 2 continuously increasing. This preparation is of a clearly improved quality compared to the prior art where the oxidation was done separately from the reduction of rust.
  • 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 regularly dosed.
  • the atmosphere used is a reducing atmosphere. That is to say that the oxidizing ratio or rate of oxidation 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 checked.
  • the oxidizing atmosphere is produced from such a reducing atmosphere by adding a pressure of water vapor which serves as an oxidizing body.

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  • 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)

Claims (7)

1. Verfahren zur Herstellung der Eisenteile, die im Inneren einer Farbfernsehröhre angeordnet werden müssen, dadurch gekennzeichnet, daß jedes Teil zuerst einer Wärmebehandlung in reduzierender Atmosphäre ausgesetzt wird, um den Rost zu eliminieren, dann durch oxydierende Atmosphären mit variablem Oxidationsgrad oxydiert wird, um eine Eisenoxidschicht FeO ausgehend von der reinen Eisenfläche zu bilden, und dann diese Schicht oberflächlich in ein Eisenoxid Fe304 umgewandelt wird, in einem einzigen Ofen, in welchem die Teile kontinuierlich durchlaufen, ohne Trennung zwischen den Behandlungszonen (3,4, 5).
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß das Oxidationsverhältnis der Ofenatmosphäre in der Wärmebehandlungszone unter reduzierender Atmosphäre nahe bei dem Wert eins für eine Erhitzungstemperatur von max. 760°C liegt, so daß eine Reduktion des Rostes erfolgt.
3. Verfahren nach Anspruch 2, dadurch gekennzeichnet, daß das VolumenOxidationsverhältnis nahe dem Wert 0,4 (vier Zehntel) für eine Erhitzungstemperatur von wenigstens 700°C ist, so daß eine oberflächliche Oxidation zu Eisenoxid FeO erfolgt.
4. Verfahren nach Anspruch 3, dadurch gekennzeichnet, daß das Volumenoxidationsverhältnis etwa gleich dem Wert 0,25 für eine Temperatur ist, welche kleiner als 550°C ist, so daß eine oberflächliche oxidation zu Eisenoxid Fe304 erfolgt.
5. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die oxidierende Atmosphäre ausgehend von der reduzierenden Atmosphäre durch Zufügung von Wasserdampf unter Druck in den Oxidationsbehandlungszonen (4, 5) erhalten wird.
6. Verfahren nach Anspruch 1 oder 5, dadurch gekennzeichnet, daß die reduzierende Atmosphäre aus 95 Vol.-% Stickstoff und 5 Vol.- % Wasserstoff besteht.
7. Verfahren nach Anspruch 6, dadurch gekennzeichnet, daß die Stickstoff-WasserstoffAtmosphäre durch einen Gasmischer erhalten wird.
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 EP0149927A1 (de) 1985-07-31
EP0149927B1 true 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)

Families Citing this family (15)

* 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.
DE3639657A1 (de) * 1986-11-20 1988-06-01 Philips Patentverwaltung Verfahren zum reinigen von metallbauteilen fuer kathodenstrahlroehren
JP2590182B2 (ja) * 1987-03-07 1997-03-12 株式会社東芝 黒化炉およびこの黒化炉を使用したシャドウマスクの製造方法
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
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.
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

Family Cites Families (8)

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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
US2591460A (en) * 1949-08-17 1952-04-01 Gen Electric Process for providing magnetic sheet steel with an insulative film
US3307981A (en) * 1963-11-14 1967-03-07 Inland Steel Co Continuous bluing and annealing process
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
US4285106A (en) * 1979-12-13 1981-08-25 Gte Laboratories Incorporated Method for producing color cathode ray tube aperture masks
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
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 (1)

* Cited by examiner, † Cited by third party
Title
Valno Berichte, Band XVIII, Heft 1/2, S. 83-87, Hamburg, April 1974 *

Also Published As

Publication number Publication date
US4714497A (en) 1987-12-22
HK49294A (en) 1994-05-27
FR2532108A1 (fr) 1984-02-24
EP0149927A1 (de) 1985-07-31
FR2532108B1 (de) 1985-05-03
JPH0742565B2 (ja) 1995-05-10
JPS60174867A (ja) 1985-09-09

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