DE2027264A1 - Electric discharge tube with a graphite-containing conductive wall coating - Google Patents
Electric discharge tube with a graphite-containing conductive wall coatingInfo
- Publication number
- DE2027264A1 DE2027264A1 DE19702027264 DE2027264A DE2027264A1 DE 2027264 A1 DE2027264 A1 DE 2027264A1 DE 19702027264 DE19702027264 DE 19702027264 DE 2027264 A DE2027264 A DE 2027264A DE 2027264 A1 DE2027264 A1 DE 2027264A1
- Authority
- DE
- Germany
- Prior art keywords
- graphite
- tube
- discharge tube
- boehmite
- cone
- 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.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/86—Vessels; Containers; Vacuum locks
- H01J29/88—Vessels; Containers; Vacuum locks provided with coatings on the walls thereof; Selection of materials for the coatings
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C17/00—Surface treatment of glass, not in the form of fibres or filaments, by coating
- C03C17/22—Surface treatment of glass, not in the form of fibres or filaments, by coating with other inorganic material
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2217/00—Coatings on glass
- C03C2217/20—Materials for coating a single layer on glass
- C03C2217/29—Mixtures
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C2218/00—Methods for coating glass
- C03C2218/10—Deposition methods
- C03C2218/11—Deposition methods from solutions or suspensions
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Vessels, Lead-In Wires, Accessory Apparatuses For Cathode-Ray Tubes (AREA)
Description
PHN.4136 Dr.-Inp. Hans-Dietrich Zeller PHN.4136 Dr.-Inp. Hans-Dietrich Zeller
»„ip..umwBit 7 p*»" Ip..umw B it 7 p *
Ar,,^r: N.V.Philip^Cioaifcr^fcbrfeken ' Ar ,, ^ r: NV Philip ^ Cioaifcr ^ fcbrfeken '
Akte No. PHN- 4136File No. PHN-4136
Anmsldunavom: 2.JU2li 1970 Date of registration: June 2nd, 1970
"Elektrische Entladungsröhre mit einem graphithaltigen leitenden Wandüberzug". ."Electrical discharge tube with a graphite-containing conductive wall coating". .
Die Erfindung bezieht sich auf eine elektrische Entladungsröhre, insbesondere eine Kathodenstrahlröhre, mit einer leitenden aus Graphit und einem Haftmittel bestehenden Innenschicht. Diese leitenden Schichten werden als wässrige Suspension auf der aus Glas bestehenden Kolbenwand der Entladungsröhre angebracht und dann getrocknet! sie dienen u.a. zur Herstellung leitender Verbindungen, z.B. zwischen dem Anodenkontekt und anderen Teilen des Elektrodensystem». Die Erfindung bezieht sich weiterhinThe invention relates to an electrical Discharge tube, especially a cathode ray tube, with a conductive inner layer made of graphite and an adhesive. These conductive layers are called aqueous suspension attached to the glass bulb wall of the discharge tube and then dried! they are used, among other things, to establish conductive connections, e.g. between the anode contact and other parts of the Electrode system ». The invention also relates
009850/1595009850/1595
PHN.k136PHN. k 136
auf ein Verfahren zur Herstellung einer derartigen leitenden Innenschicht.to a method of making such a conductive one Inner layer.
Die im allgemeinen verwendeten wässrigen Graphitsuspensionen enthalten als Haftmittel ein Silicat, z.B. Natriumsilicat■ , während die Suspension mit einer organischen Verbindung, z.B. einem Alginat, stabilisiert wird. Die Stabilisierung bezieht sich auf die Theologischen Eigenschaften der Suspension. Wenn die Röhre bei hohen Spannungen verwendet wird, was z.B. bei Farbfernsehkathodenstrahlröhren der Fall ist, werden der leitenden Innenschicht hohe Anforderungen gestellt; um eine gute Haftung der Schicht zu sichern, muss dann eine grössere Haftmittelmenge verwendet werden. Es hat sich aber herausgestellt, dass sich beim Vorhandensein einer grosseren Silicatmenge in einer Röhre, die u.a. infolge der höheren Spannung eine höhere Betriebstemperatur aufweist, Schwierigkeiten ergehen, die durch eine unerwünschte Beeinflussung der Emission der Kathode herbeigeführt werden. Auch das Vorhandensein des organischen Stabilisierungsmittels, das sich oft schwer aueheizen lässt, spielt dabei noch eine Rolle; es ist nie ganz sicher, dass dieses Mittel beim Ausheizen der Röhre rückstandslos verschwindet.The generally used aqueous graphite suspensions contain a silicate as an adhesive, e.g. Sodium silicate ■ while the suspension with an organic Compound, e.g. an alginate, is stabilized. The stabilization refers to the Theological Properties of the suspension. When the tube at high voltages is used, which is e.g. used in color television cathode ray tubes If so, the inner conductive layer will be high Requirements made; In order to ensure good adhesion of the layer, a larger amount of adhesive must then be used will. It has been found, however, that when a larger amount of silicate is present in one Tubes that have a higher operating temperature as a result of the higher voltage, among other things, experience difficulties that caused by an undesirable influence on the emission of the cathode. The presence of the organic stabilizer, which is often difficult heats up, still plays a role; it is never entirely certain that this means when the tube is baked out disappears without leaving any residue.
Die Erfindung begegnet diesen Nachteilen dadurch, dass eine Suspension verwendet wird, die kein Silicat und kein,organisches Stabilisierungsmittel enthält. Nach der Erfindung besteht das Haftmittel aus Aluminiumoxyd. Eine haftende leitende Innenschicht, die aus GraphitThe invention overcomes these disadvantages in that a suspension is used which contains no silicate and no organic stabilizing agent. According to the invention, the adhesive consists of aluminum oxide. An adhesive conductive inner layer made from graphite
009850/1595009850/1595
und. Aluminiumoxyd besteht, wird dadurch erhalten, dass von einer wässrigen Suspension von Graphit und Aluminiumoxyd mit einer reaktiven Gruppe, z.B. Aluminiumhydroxyd oder Aluminiumoxyhydroxyd, ausgegangen wird. Sowohl die haftende Funktion des Silicate als auch die stabilisierenden Eigenschaften der organischen Verbindungen werden von dem Aluminiumoxyd mit einer reaktiven Gruppe übernommen. Bei dem Verfahren nach der Erfindung zur Herstellung einer leitenden Innenschicht auf einer elektrischen Entladungsröhre' wird auf der Wand eine wässrige Suspension angebracht, die nur Graphit und Aluminiumoxyd mit einer reaktiven Gruppe enthält.and. Aluminum oxide is obtained in that from an aqueous suspension of graphite and aluminum oxide with a reactive group, e.g. aluminum hydroxide or aluminum oxyhydroxide. Both the adhesive function of the silicate as well as the stabilizing properties of the organic compounds are of taken over from aluminum oxide with a reactive group. In the method according to the invention for producing a conductive inner layer on an electrical discharge tube ' an aqueous suspension is attached to the wall containing only graphite and aluminum oxide with a reactive group contains.
Besonders günstige Ergebnisse wurden mit einer Suspension erzielt, die kolloidales Böhmit (AIOOH) enthält, das eine nadeiförmige Struktur aufweist. Vorzugsweise hat das Aluminiumoxyd der leitenden Innenschicht eine Böhmitstruktur. Ferner enthält bei diesem Verfahren die Suspension vorzugsweise kolloidales Böhmit. Es sei bemerkt, dass aus der USA Patentschrift 2,915»^75 ein Gemisch aus vorzugsweise trocknem Aluminiumoxyd mit nadeiförmiger Struktur und einem trocknen Schmiermittel, wie Graphit, bekannt ist. Zusammensetzungen dieser Art können zum Schmieren von™ Metalloberflächen während Bearbeitungen des Metalls verwendet werden. Ferner ist in Dupont "Baymal" Colloidal Alumina I96I eine wässrige Suspension von Graphit und Böhmit mit einer Anzahl Anwendungsmöglichkeiten genannt, ohne dass jedoch die besonderen Eigenschaften erwähnt wurden,Particularly favorable results have been achieved with a suspension containing colloidal boehmite (AIOOH), which has a needle-shaped structure. The aluminum oxide of the conductive inner layer preferably has a boehmite structure. Furthermore, in this process, the suspension preferably contains colloidal boehmite. It should be noted that from the USA patent 2,915 »^ 75 a mixture of preferably dry alumina with a needle-shaped structure and a dry lubricant such as graphite are known is. Compositions of this type can be used to lubricate metal surfaces while machining the metal will. Furthermore, in Dupont "Baymal" Colloidal Alumina I96I an aqueous suspension of graphite and boehmite with a number of possible uses, without that however the special properties were mentioned,
0098 50/1595
BADORlQiMAL0098 50/1595
BADORlQiMAL
Claims (2)
Patentansprüche;The conductive layer 5 can be obtained in the following manner, for example. An aqueous suspension of boehmite (AIOOH) is added to dry graphite in vacuo and this mixture, which contains 15 parts of graphite, 15 parts of boehmite and 70 parts of water, is vigorously stirred for 2 hours. The graphite suspension produced in this way is sprayed onto the inside of the cone with the aid of a high-pressure vessel. During the manufacture of the tube is subjected to the cone of a number Heizbearbeitungen, in which temperatures up to 45O 0 C occur, whereby on the cone a well-adhering layer forms. It has been found that the tube produced in this way can be exposed to high operating temperatures without the emission being impaired.
Claims ;
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6908599A NL6908599A (en) | 1969-06-05 | 1969-06-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
DE2027264A1 true DE2027264A1 (en) | 1970-12-10 |
Family
ID=19807120
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19702027264 Pending DE2027264A1 (en) | 1969-06-05 | 1970-06-03 | Electric discharge tube with a graphite-containing conductive wall coating |
Country Status (4)
Country | Link |
---|---|
DE (1) | DE2027264A1 (en) |
FR (1) | FR2049994A5 (en) |
GB (1) | GB1254259A (en) |
NL (1) | NL6908599A (en) |
-
1969
- 1969-06-05 NL NL6908599A patent/NL6908599A/xx unknown
-
1970
- 1970-06-03 GB GB2682670A patent/GB1254259A/en not_active Expired
- 1970-06-03 DE DE19702027264 patent/DE2027264A1/en active Pending
- 1970-06-05 FR FR7020755A patent/FR2049994A5/fr not_active Expired
Also Published As
Publication number | Publication date |
---|---|
GB1254259A (en) | 1971-11-17 |
FR2049994A5 (en) | 1971-03-26 |
NL6908599A (en) | 1970-12-08 |
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