DE455749C - Insulating glasses that contain silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide - Google Patents

Insulating glasses that contain silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide

Info

Publication number
DE455749C
DE455749C DEP51034D DEP0051034D DE455749C DE 455749 C DE455749 C DE 455749C DE P51034 D DEP51034 D DE P51034D DE P0051034 D DEP0051034 D DE P0051034D DE 455749 C DE455749 C DE 455749C
Authority
DE
Germany
Prior art keywords
oxide
bivalent
potassium
trivalent metal
sodium
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
DEP51034D
Other languages
German (de)
Inventor
Dr Georg Gehlhoff
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.)
Osram GmbH
Original Assignee
Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
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 Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH filed Critical Patent Treuhand Gesellschaft fuer Elektrische Gluehlampen mbH
Priority to DEP51034D priority Critical patent/DE455749C/en
Application granted granted Critical
Publication of DE455749C publication Critical patent/DE455749C/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/02—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances
    • H01B3/08—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of inorganic substances quartz; glass; glass wool; slag wool; vitreous enamels
    • H01B3/087—Chemical composition of glass
    • 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/089—Glass compositions containing silica with 40% to 90% silica, by weight containing boron
    • 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
    • C03C3/00—Glass compositions
    • C03C3/04—Glass compositions containing silica
    • C03C3/076—Glass compositions containing silica with 40% to 90% silica, by weight
    • C03C3/102—Glass compositions containing silica with 40% to 90% silica, by weight containing lead

Description

Gläser für Isolationszwecke, die Kieselsäure, Kaliumoxyd, Natriumoxyd und mindestens ein zwei- oder -dreiwertiges Metalloxyd enthalten. Es ist bekannt, daß das elektrische Leitvermögen auch der Kieselsäure, Kaliumoxyd, Natriumoxyd und mindestens ein zwei- oder dreiwertiges Metalloxyd enthaltenden Gläser im wesentlichen durch ihren Gehalt an Alkalien bedingt wird und daß insbesondere Natriumoxy(1 einen sehr ungünstigen Einfluß auf (las elektrische Leitvermögen hat. Aus diesem Grunde lag es nahe, Gläser für Isolationszwecke zu verschmelzen, bei denen als Flußmittel ausschließlich Kaliumoxyd verwendet wird. '-Erlindungsgemäß wurde festgestellt, daß man solche als Alkalimetall nur Kaliumoxyd enthaltenden Gläser in ihren elektrischen Eigenschaften dadurch verbessern kann, daß man einen gewissen Teil des Kaliumoxyds durch Natriumoxyd ersetzt, und zwar werden die besten Ergebnisse erzielt, d. h. die größte Isolationsfähigkeit erreicht, wenn in dem Kieselsäure, Kaliumoxyd, Natriumoxyd und mindestens ein zwei- oder dreiwertiges Metalloxyd enthaltenden Glas das Verhältnis des Kaliumoxyd zum Natriumoxyd in den Grenzen 7 : 1 bis 3 : 1 liegt, wobei das Verhältnis dieser beiden in gewissem Umfange von den übrigen Bestandteilen des Glases beeinflußt wird. Man wird daher bei Gläsern für Isolationszwecke, z. B. für die Glühlampenindustrie, darauf achten, daß das Verhältnis der Alkalimetalle innerhalb der angegebenen Grenzen liegt, um so bei vorhandener -Notwendigkeit der Einführl-:ng von Alkalien als Flußmittel ein Minimum an Leitvermögen zu erzielen. Als Beispiel eines solchen Glases sei folgende Zusammenstellung gegeben: Si07 65 Gewichtsprozente, K=O 12 Gewichtsprozente, Na=O 3 Gewichtsprozente, Pb0 2o Gewichtsprozente: Ein anderes geeignetes Glas hat etwa die Zusammensetzung. Si0= 7o Gewichtsprozente, K.0 8 Gewichtsprozente, \a,0 2 Gewichtsprozente, B=03 to Gewichtsprozente, Ba0 to Gewichtsprozente. Bei sehr hohem Borsäuregehalt wählt man zweckmäßig das Verhältnis von Kalium- zu Natriumoxyd in der -Nähe von 7 : 1.Glasses for insulation purposes, the silica, potassium oxide, sodium oxide and contain at least one bivalent or trivalent metal oxide. It is known, that the electrical conductivity also of silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide containing glasses essentially is due to their alkaline content and that in particular sodium oxy (1 a very unfavorable influence on (which has electrical conductivity. For this reason it made sense to fuse glasses for insulation purposes, with those as flux only potassium oxide is used. According to the invention, it was established that such glasses containing only potassium oxide as alkali metal can be found in their electric glasses Properties can be improved by removing a certain amount of the potassium oxide replaced with sodium oxide for best results; H. the greatest insulation capacity is achieved when in the silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide-containing glass has the ratio of potassium oxide to sodium oxide is within the limits of 7: 1 to 3: 1, the ratio being these two are influenced to a certain extent by the other components of the glass will. It is therefore used in glasses for insulation purposes, for. B. for the incandescent lamp industry, make sure that the ratio of alkali metals is within the specified limits is, the more so if there is a need for the introduction length of alkalis as a flux to achieve a minimum of conductivity. The following is an example of such a glass Compilation given: Si07 65 percent by weight, K = O 12 percent by weight, Na = O 3 percent by weight, Pb0 2o percent by weight: Another suitable glass has about the composition. Si0 = 7o percent by weight, K.0 8 percent by weight, \ a, 0 2 percent by weight, B = 03 to percent by weight, Ba0 to percent by weight. With a very high boric acid content it is expedient to choose the ratio of potassium to sodium oxide in the vicinity of 7: 1.

Claims (1)

PATENTANSPRUCH: Elektrische Isolation aus Glas, dadurch gekennzeichnet, daß das Glas Kieselsäure, Kaliumoxyd, Natriumoxvd und mindestens ein zwei- oller dreiwertiges 1Ietalloxy d enthält und (las Verhältnis des Kaliumoxyds zum Natriumoxyd in den Grenzen 7 : i bis 3 : 1 liegt. PATENT CLAIM: Electrical insulation made of glass, characterized in that the glass contains silica, potassium oxide, sodium oxide and at least one divalent trivalent metal oxide and (the ratio of potassium oxide to sodium oxide is within the limits of 7: 1 to 3: 1.
DEP51034D 1925-08-01 1925-08-02 Insulating glasses that contain silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide Expired DE455749C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEP51034D DE455749C (en) 1925-08-01 1925-08-02 Insulating glasses that contain silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE254174X 1925-08-01
DEP51034D DE455749C (en) 1925-08-01 1925-08-02 Insulating glasses that contain silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide

Publications (1)

Publication Number Publication Date
DE455749C true DE455749C (en) 1928-02-07

Family

ID=25769411

Family Applications (1)

Application Number Title Priority Date Filing Date
DEP51034D Expired DE455749C (en) 1925-08-01 1925-08-02 Insulating glasses that contain silica, potassium oxide, sodium oxide and at least one bivalent or trivalent metal oxide

Country Status (1)

Country Link
DE (1) DE455749C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1441215B1 (en) * 1961-06-19 1971-07-15 Corning Glass Works DELAY MEDIUM FOR A SOLID ULTRASCHA LLVER DELAY ARRANGEMENT AND METHOD FOR ITS MANUFACTURING

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1441215B1 (en) * 1961-06-19 1971-07-15 Corning Glass Works DELAY MEDIUM FOR A SOLID ULTRASCHA LLVER DELAY ARRANGEMENT AND METHOD FOR ITS MANUFACTURING

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