DE688782C - Process for the manufacture of objects from vitreous silica - Google Patents

Process for the manufacture of objects from vitreous silica

Info

Publication number
DE688782C
DE688782C DE1937S0128140 DES0128140D DE688782C DE 688782 C DE688782 C DE 688782C DE 1937S0128140 DE1937S0128140 DE 1937S0128140 DE S0128140 D DES0128140 D DE S0128140D DE 688782 C DE688782 C DE 688782C
Authority
DE
Germany
Prior art keywords
objects
manufacture
vitreous silica
sintering
silica
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
DE1937S0128140
Other languages
German (de)
Inventor
Dr Franz Skaupy
Gustav Josef Weissenberg
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.)
Individual
Original Assignee
Individual
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
Priority claimed from DES125422D external-priority patent/DE682719C/en
Application filed by Individual filed Critical Individual
Priority to DE1937S0128140 priority Critical patent/DE688782C/en
Application granted granted Critical
Publication of DE688782C publication Critical patent/DE688782C/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B19/00—Other methods of shaping glass
    • C03B19/06—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction
    • C03B19/066—Other methods of shaping glass by sintering, e.g. by cold isostatic pressing of powders and subsequent sintering, by hot pressing of powders, by sintering slurries or dispersions not undergoing a liquid phase reaction for the production of quartz or fused silica articles
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B20/00—Processes specially adapted for the production of quartz or fused silica articles, not otherwise provided for

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Dispersion Chemistry (AREA)
  • Glass Melting And Manufacturing (AREA)

Description

Verfahren zum Herstellen von Gegenständen aus glasiger Kieselsäure Es wurde gefunden, daß man die nach dem Hauptpatent erhaltenen Gegenstände dadurch mit einer spiegelglatten Oberfläche versehen kann, daß die Gegenstände vorzugsweise unmittelbar anschließend an die die Sinterung der Kieselsäurekörner bewirkende Erhitzung kurze Zeit auf eine erheblich höhere Temperatur, als zur Sinterunig der Kieselsäurekörner erforderlich ist, erhitzt werden. Diese Oberflächenverglasung ist überraschenderweise auszuführen, ohne daß in den tieferen Schichten der Gegenstände eine nachteilige Cristobalitbildung auftritt. Die kurzfristige, hohe Erhitzung genügt also wohl dazu, die Oberfläche zum Schmelzen zu bringen, äußert jedoch keine tiefer gehenden Einwirkungen, was nicht vorauszusehen war. _ . . . Nach dem neuen Verfahren gelingt es, die nach dem Hauptpatent erhaltenen Erzeugnisse mit einer glasigen, durchschmolzenen, äußerst dichten Oberfläche zu versehen, indem man beispielsweise unmittelbar im Anschluß an den Sinterungsvorgang die Gegenstände nur wenige Minuten oberhalb der Sintertemperatur, vorzugsweise über i700° C, hält. Durch die kurzzeitige Überhitzung leidet die Formbeständigkeit geformter Teile nicht, da nur die Oberfläche unter der Einwirkung der erhöhten Temperatur steht.Process for the manufacture of objects from vitreous silica It has been found that the objects obtained according to the main patent can thereby can be provided with a mirror-smooth surface that the objects preferably immediately after the heating which causes the sintering of the silica grains for a short time to a considerably higher temperature than when the silica grains were sintered is required to be heated. This surface glazing is surprising carry out without a disadvantageous in the deeper layers of the objects Cristobalite formation occurs. The short-term, high heating is therefore probably sufficient to Bringing the surface to melt, however, does not express any deeper effects, what could not be foreseen. _. . . According to the new process, the after the main patent obtained products with a glassy, melted, extremely to provide a dense surface, for example by immediately following during the sintering process, the objects are only a few minutes above the sintering temperature, preferably above 1700 ° C. The short-term overheating affects the dimensional stability molded parts are not, as only the surface is exposed to the increased temperature stands.

Beispielsweise verfährt man bei der Herstellung von Ouarztiegeln mit 3 mm Wandstärke so, daß man den Tiegel bei 158o° C in den Ofen bringt und mit gleichmäßigem Temperaturanstieg in io Minuten bis i730° C fährt. Dann ist der Tiegel gut durchgesintert, die Oberfläche verglast und äußerst dicht, ohne daß eine Formänderung des Tiegels während des Sin.terns und des anschließenden Verglasens der Oberfläche stattgefunden hat.For example, one proceeds with the production of ouatar crucibles 3 mm wall thickness so that the crucible is brought into the oven at 158o ° C and with an even temperature Temperature rise in 10 minutes to 1730 ° C moves. Then that is Crucible well sintered, the surface glazed and extremely tight, without any Change in shape of the crucible during sintering and subsequent vitrification the surface has taken place.

Claims (1)

PATENTAN SPRUCFI Verfahren zum Herstellen von Gegenständen aus glasiger Kieselsäure nach Patent 682 71g, dadurch gekennzeichnet, daß zur Erzeugung einer Oberflächenverglasung die Gegenstände, vorzugsweise unmittelbar anschließend an die die Sinterung der Kieselsäurekörner bewirkende Erhitzung, kurze Zeit auf eine erheblich höhere Temperatur, als zur Sinterung der Kieselsäurekörner erforderlich, erhitzt werden.PATENTAN SPRUCFI Process for the manufacture of objects from vitreous Silica according to patent 682 71g, characterized in that for the production of a Surface glazing the objects, preferably immediately afterwards the heating causing the sintering of the silica grains, for a short time significantly higher temperature than required for sintering the silica grains, be heated.
DE1937S0128140 1936-12-20 1937-07-22 Process for the manufacture of objects from vitreous silica Expired DE688782C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE1937S0128140 DE688782C (en) 1936-12-20 1937-07-22 Process for the manufacture of objects from vitreous silica

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DES125422D DE682719C (en) 1936-12-20 1936-12-20 Process for the manufacture of objects from vitreous silica
DE1937S0128140 DE688782C (en) 1936-12-20 1937-07-22 Process for the manufacture of objects from vitreous silica

Publications (1)

Publication Number Publication Date
DE688782C true DE688782C (en) 1940-03-01

Family

ID=25998970

Family Applications (1)

Application Number Title Priority Date Filing Date
DE1937S0128140 Expired DE688782C (en) 1936-12-20 1937-07-22 Process for the manufacture of objects from vitreous silica

Country Status (1)

Country Link
DE (1) DE688782C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2218766A1 (en) * 1971-04-19 1972-12-07 Mellen E Method and device for the manufacture of thin-walled objects made of quartz glass

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2218766A1 (en) * 1971-04-19 1972-12-07 Mellen E Method and device for the manufacture of thin-walled objects made of quartz glass

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