DE957637C - Process for the production of high-quality refractory "molded bodies on a silica-alumina basis - Google Patents
Process for the production of high-quality refractory "molded bodies on a silica-alumina basisInfo
- Publication number
- DE957637C DE957637C DENDAT957637D DE957637DA DE957637C DE 957637 C DE957637 C DE 957637C DE NDAT957637 D DENDAT957637 D DE NDAT957637D DE 957637D A DE957637D A DE 957637DA DE 957637 C DE957637 C DE 957637C
- Authority
- DE
- Germany
- Prior art keywords
- silica
- production
- ceramic
- temperature
- clay
- 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
Links
- PNEYBMLMFCGWSK-UHFFFAOYSA-N AI2O3 Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims description 3
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 238000000034 method Methods 0.000 title claims 2
- 239000004927 clay Substances 0.000 claims description 7
- 229910052570 clay Inorganic materials 0.000 claims description 7
- 239000005995 Aluminium silicate Substances 0.000 claims description 6
- PZZYQPZGQPZBDN-UHFFFAOYSA-N Aluminium silicate Chemical compound O=[Al]O[Si](=O)O[Al]=O PZZYQPZGQPZBDN-UHFFFAOYSA-N 0.000 claims description 6
- 235000012211 aluminium silicate Nutrition 0.000 claims description 6
- 229910052851 sillimanite Inorganic materials 0.000 claims description 6
- 229910052863 mullite Inorganic materials 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 2
- 239000002994 raw material Substances 0.000 claims description 2
- 230000001131 transforming Effects 0.000 claims description 2
- 239000000919 ceramic Substances 0.000 claims 3
- 241000277342 Esox lucius Species 0.000 claims 1
- 238000010304 firing Methods 0.000 claims 1
- 239000011819 refractory material Substances 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 2
- 230000005712 crystallization Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005816 glass manufacturing process Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000006060 molten glass Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000000844 transformation Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B33/00—Electroluminescent light sources
- H05B33/12—Light sources with substantially two-dimensional radiating surfaces
- H05B33/22—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers
- H05B33/24—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of auxiliary dielectric or reflective layers of metallic reflective layers
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/01—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics
- C04B35/16—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay
- C04B35/18—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products based on oxide ceramics based on silicates other than clay rich in aluminium oxide
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Oxide Ceramics (AREA)
Description
(WiGBl. S. 175)(WiGBl. P. 175)
AUSGEGEBEN AM 28. FEBRUAR 1957ISSUED FEBRUARY 28, 1957
S 22890 IVcj80b S 22890 IVcj80b
Michel Kantzer, ParisMichel Kantzer, Paris
ist als Erfinder genannt wordenhas been named as the inventor
Die Erfindung betrifft die Herstellung von hochwertigen feuerfesten Formkörpern auf Kieselsäure- und Tonerde-Basis, insbesondere zum Zwecke der Verwendung für öfen zur Glasherstellung.The invention relates to the production of high quality refractory moldings on silica and alumina base, particularly for use in glass-making furnaces.
Es ist bekannt, daß bei hinreichend, langer Erhitzung eines kaolinhaltigen Tons auf eine Temperatur zwischen 6oo und 7500 eine Umwandlung von der kristallinen in die amorphe Struktur erfolgt, die als Metakaolin bezeichnet wird. Ferner ist es bekannt, daß im Zuge der weiteren Erhitzung auf höhere Temperaturen eine Rekristallisation unter Sillimanitbildung und schließlich bei etwa 15000 und höher der Übergang in die Mullitstruktur stattfindet.It is known that if a clay containing kaolin is heated for a sufficiently long time to a temperature between 600 and 750 0, a conversion from the crystalline to the amorphous structure takes place, which is referred to as metakaolin. Further, it is known that in the course of further heating a recrystallization Sillimanitbildung and finally at about 1500 to 0 or higher, the transition to the mullite takes place at higher temperatures.
Erfindungsgemäß wird kaolinhaltiger Ton, der gegebenenfalls freie Kieselsäure enthalten kann, auf eine Temperatur von zwischen 600 und 7500 für eine Zeitdauer erhitzt, die, gegebenenfalls durch Versuche mittels X-Strahlen ermittelt, ausreicht, um jede kristalline Struktur zu zerstören, worauf das so behandelte Material abgekühlt, in geeigneter Weise zerkleinert, dann unter Druck verformt und der derart hergestellte Formkörper bei einer Temperatur in der Größenordnung von 15000 gebrannt wird, bei welcher das Material in Form von Mullit kristallisiert.According to the invention, clay containing kaolin, which can optionally contain free silica, is heated to a temperature of between 600 and 750 0 for a period of time which, if necessary, determined by tests using X-rays, is sufficient to destroy every crystalline structure, whereupon the treated in this way The material is cooled, comminuted in a suitable manner, then deformed under pressure and the shaped body produced in this way is fired at a temperature of the order of 1500 0 , at which the material crystallizes in the form of mullite.
Die bei dieser Behandlung erfolgenden Umwandlungen, welche die endgültige Kristallistion desThe transformations which take place during this treatment and which lead to the final crystallization of the
Materials in Form von Mullit bewirken, führen zu einer gedrängten kristallinen Struktur des Körpers, der im Ergebnis die Eigenschaften eines bei 15000 gebrannten natürlichen Sillimanite besitzt. Die endgültige kristalline Struktur ist eine um so gedrängtere, je höher der angewendete Formgebungsdruck ist.Material in the form of mullite lead to a compact crystalline structure of the body, which as a result has the properties of a natural sillimanite fired at 1500 0. The final crystalline structure is the more compact, the higher the molding pressure applied.
Die Zeitdauer, für die der kaolinhaltige Ton auf einer Temperatur von zwischen 600 und 7500 gehalten wird, ist veränderlich. Sie hängt im wesentlichen von seinem Gehalt an freier Kieselsäure und seiner Körnung sowie den in dem verwendeten kaolinhaltigen Ton enthaltenen Verunreinigungen ab.The length of time for which the clay containing kaolin is kept at a temperature of between 600 and 750 0 is variable. It depends essentially on its content of free silica and its grain size as well as the impurities contained in the clay containing kaolin.
Um die Kristallisation zu Mullit zu erleichtern, kann es vorteilhaft sein, den durch die Wärmebehandlung zwischen 600 und 7500 und anschließende Abkühlung in amorphen Zustand überführten kaolinhaltigen Ton nicht gebrannten Sillimanit unter inniger Vermischung zuzusetzen und dann in der oben beschriebenen Weise weiterzuarbeiten. Zufriedenstellende Ergebnisse wurden durch Zusatz kleiner anteiliger Mengen von nicht gebranntem Sillimanit erzielt, die nicht über 5°/o hinausgehen.In order to facilitate the crystallization to mullite, it can be advantageous to add the kaolin-containing clay, which has been transformed into an amorphous state by the heat treatment between 600 and 750 0 and subsequent cooling, to unburned sillimanite with intimate mixing and then to continue working in the manner described above. Satisfactory results have been obtained by adding small proportions of unfired sillimanite, not exceeding 5%.
Korrosions- und Verschleißversuche zum Zwecke der Feststellung des Verhaltens der so hergestellten Formkörper im Kontakt mit geschmolzenem Glas zeigen, daß diese sich ebenso günstig verhalten wie solche, die aus natürlichem oder aus synthetischem aus verschiedenen Komponenten, hergestelltem Sillimanit als Ausgangsmaterial erhalten werden. Da natürliches Sillimanit jedoch nicht überall zur Verfugung steht, zeigt das Verfahren nach der Erfindung einen Weg, in großer Menge vorhandene Ausgangsstoffe hierfür zu verwenden.Corrosion and wear tests for the purpose of determining the behavior of those produced in this way Shaped bodies in contact with molten glass show that these behave just as favorably as those made from natural or synthetic sillimanite made from various components can be obtained as a starting material. However, since natural sillimanite is not available everywhere stands, the method according to the invention shows a way of existing in large quantities To use raw materials for this.
Claims (2)
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE957637C true DE957637C (en) | 1957-01-17 |
Family
ID=582148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DENDAT957637D Expired DE957637C (en) | Process for the production of high-quality refractory "molded bodies on a silica-alumina basis |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE957637C (en) |
-
0
- DE DENDAT957637D patent/DE957637C/en not_active Expired
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