DE541554C - Process for the production of a difficult-to-melt glass - Google Patents

Process for the production of a difficult-to-melt glass

Info

Publication number
DE541554C
DE541554C DEJ23573D DEJ0023573D DE541554C DE 541554 C DE541554 C DE 541554C DE J23573 D DEJ23573 D DE J23573D DE J0023573 D DEJ0023573 D DE J0023573D DE 541554 C DE541554 C DE 541554C
Authority
DE
Germany
Prior art keywords
glass
oxide
difficult
lime
magnesia
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
DEJ23573D
Other languages
German (de)
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.)
Schott AG
Original Assignee
Jenaer Glaswerk Schott and Gen
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 Jenaer Glaswerk Schott and Gen filed Critical Jenaer Glaswerk Schott and Gen
Priority to DEJ23573D priority Critical patent/DE541554C/en
Application granted granted Critical
Publication of DE541554C publication Critical patent/DE541554C/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C03C3/091—Glass compositions containing silica with 40% to 90% silica, by weight containing boron containing aluminium
    • 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
    • C03C3/108—Glass compositions containing silica with 40% to 90% silica, by weight containing lead containing boron

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)
  • Glass Compositions (AREA)

Description

Verfahren zur Herstellung eines schwer schmelzbaren Glases Die vorliegende Erfindung betrifft ein Verfahren zur Herstellung eines schwer schmelzbaren und gegen schroffe Temperaturschwankungen besonders unempfindlichen Glases, das mindestens 45 ° o Kieselsäure, 2 bis 1ä 0;o Borsäure und von Magnesia und Kalk zusammen ¢ bis 30 °,'o enthält, wobei dieses Glas anstatt Magnesia und Kalk auch Barvt und Zinkoxyd in äquivalenten Mengen enthalten kann. Bei den bekannten Gläsern dieser Art wird dem Glassatz als Schmelzmittel Alkali zugesetzt, nach der vorliegenden Erfindung jedoch läßt sich ein Glas von besonders hohem Erweichungspunkt und sehr kleiner Ausdehnungszahl herstellen, wenn von Aikali nur in mäßigem Umfange Gebrauch 'gemacht und Tonerde als Schmelzmittel verwendet wird, und zwar darf einerseits das Glas höchstens S °,ö Alkali enthalten und muß andererseits 2o bis 30 °,"o Tonerde enthalten.Method of making a refractory glass The present Invention relates to a method for producing a difficult to melt and against sharp temperature fluctuations especially insensitive glass that at least 45 ° o silica, 2 to 1ä 0; o boric acid and of magnesia and lime together ¢ to 30 °, 'o, whereby this glass also contains barvt and zinc oxide instead of magnesia and lime may contain in equivalent amounts. With the known glasses of this type Alkali added to the glass set as a flux, according to the present invention however, a glass of particularly high softening point and very small can be made Establish expansion factor if only moderate use is made of Aikali and alumina is used as a flux, on the one hand the glass contain a maximum of S °, ö alkali and, on the other hand, must contain 20 to 30 °, "o alumina.

Außer den genannten Bestandteilen kann das nach dem neuen Verfahren hergestellte Glas natürlich noch geringe Mengen anderer Stoffe, z. B. zum Färben, enthalten. Auch kann man, um den Glanz zu erhöhen, noch Bleioxyd oder Antimonoxvd einführen; der Gehalt des Glases an diesen Oxyden darf jedoch G n o nicht übersteigen mit Rücksicht auf die Gefahr des Schwarzwerdens in der Flamme (bei der Bearbeitung und gegebenenfalls beim Gebrauch).In addition to the components mentioned, this can be done according to the new process produced glass of course still small amounts of other substances, such. B. for dyeing, contain. Lead oxide or antimony oxide can also be used to increase the gloss introduce; however, the content of these oxides in the glass must not exceed G n o taking into account the risk of blackening in the flame (when processing and, if necessary, during use).

Der Grad der Vermeidung von Alkali ist davon abhängig zu machen, welcher Wert auf eine hohe Er%veichungstemperatur Belegt wird. Für Beleuchtungsgläser z. B. ist keine allzuhohe Erweichungstemperatur erwünscht, weil sonst die Herstellung in unnötigem Maße erschwert werden würde. Infolgedessen sollen Beleuchtungsgläser mindestens 4 °% Alkalioxyd enthalten.The degree to which alkali is avoided depends on which one Value is assigned to a high softening temperature. For lighting glasses e.g. B. a too high softening temperature is not desired, because otherwise the production would be made unnecessarily difficult. As a result, lighting glasses are supposed to contain at least 4% alkali oxide.

Nebelglas oder Milchglas lassen sich durch Zusatz von bekannten Trübungsmitteln (z. B. von phosphorsaurem Kalk oder von Fluoriden) erzielen; auch finden sich innerhalb der angegebenen Grenzen gewisse Zusammensetzungen, die sich ohne Zusatz besonderer Mittel beim Erkalten trüben.Fog glass or milk glass can be removed by adding known opacifiers (e.g. from phosphoric acid lime or from fluorides); also find themselves within the specified limits certain compositions, which can be changed without the addition of special Cloudy agent when it cools.

Ein der Erfindung entsprechendes Glas kann z. B. folgende Zusammensetzung zeigen A1803 .......... :2-- B2 03........... 8 (Na, K) ZO ....... Pb0 ........... 3 Sb=03.......... 2 M90........... Ca0 ........... 7 SiO2 ........... 47 ioo Die Herstellung von Gläsern aus einem Glassatze, der ein fertiges Glas ergibt mit mindestens 1/3 Kieselsäure, 1;'4 bis l,"3 Tonerde, höchstens 1.'r' Borsäure und einem aus Baryt bestehenden Restbetrag ist Gegenstand des Patentes 408 53i.A glass according to the invention can, for. B. show the following composition A1803 ..........: 2-- B2 03 ........... 8 (Na, K) ZO ....... Pb0 ........... 3 Sb = 03 .......... 2 M90 ........... Ca0 ........... 7 SiO2 ........... 47 ioo The manufacture of glasses from a set of glass that results in a finished glass with at least 1/3 silica, 1; '4 to 1, "3 alumina, at most 1.'r' boric acid and a remainder of barite is the subject of patent 408 53i .

Claims (3)

PATRNTANSPRÜCIIR: i. Wrfahren ziir Herstellung eines schwer schmelzbaren Glases, das besonders unempfindlich'gegen schroffe Temperaturschwankungen ist und bei dem der Glassatz so zusammengestellt wird, daß das Glas mindestens 45 °'o Kieselsäure, 2 bis 15 % Borsäure und von Magnesia und Kalk zusammen .4 bis 3o °,!o (oder statt Magnesia und Kalk Baryt oderZinkoxyd in äquivalenten Mengen) neben wesentlichen Mengen Aluminiumoxyd enthält, dadurch gekennzeichnet, daß der Glassatz so -gewählt wird, daß das Glas Alkalioxvd, und zwar höchstens 8 ° o, und 2o bis 30 °,'o Tonerde enthält. PATENT CLAIM: i. Process for making a difficult-to-melt one Glass that is particularly insensitive to sharp temperature fluctuations and in which the glass set is put together in such a way that the glass is at least 45 ° 'o silica, 2 to 15% boric acid and of magnesia and lime together .4 to 30 °,! O (or instead of Magnesia and lime barite or zinc oxide in equivalent amounts) in addition to essentials Contains quantities of aluminum oxide, characterized in that the glassware is selected in this way is that the glass is alkali oxide, and not more than 8 ° o, and 20 to 30 °, 'o clay contains. 2. Verfahren nach Anspruch i, dadurch gekennzeichnet, daß das Glas Bleioxyd und Antimonoxyd bis zur Höhe von 6 0', enthält. 2. The method according to claim i, characterized in that the glass is lead oxide and antimony oxide up to a level of 60 '. 3. Verfahren nach Anspruch i zur Herstellungeines GlasesfürBeleuchtungszwecke, dadurch gekennzeichnet, daß das Glas mindestens 4 °o Alkalioxyd enthält.3. The method according to claim i for Manufacture of a glass for lighting purposes, characterized in that the glass Contains at least 4 ° o alkali oxide.
DEJ23573D 1923-03-22 1923-03-22 Process for the production of a difficult-to-melt glass Expired DE541554C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DEJ23573D DE541554C (en) 1923-03-22 1923-03-22 Process for the production of a difficult-to-melt glass

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEJ23573D DE541554C (en) 1923-03-22 1923-03-22 Process for the production of a difficult-to-melt glass

Publications (1)

Publication Number Publication Date
DE541554C true DE541554C (en) 1932-01-13

Family

ID=7201456

Family Applications (1)

Application Number Title Priority Date Filing Date
DEJ23573D Expired DE541554C (en) 1923-03-22 1923-03-22 Process for the production of a difficult-to-melt glass

Country Status (1)

Country Link
DE (1) DE541554C (en)

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