DE1061684B - Electric heater mass for dry pressing - Google Patents
Electric heater mass for dry pressingInfo
- Publication number
- DE1061684B DE1061684B DEB48748A DEB0048748A DE1061684B DE 1061684 B DE1061684 B DE 1061684B DE B48748 A DEB48748 A DE B48748A DE B0048748 A DEB0048748 A DE B0048748A DE 1061684 B DE1061684 B DE 1061684B
- Authority
- DE
- Germany
- Prior art keywords
- talc
- dry pressing
- soft
- pyrophyllite
- masses
- 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
- 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
- H01B3/025—Other inorganic material
-
- 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
-
- 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
- C04B35/195—Alkaline earth aluminosilicates, e.g. cordierite or anorthite
Description
Elektrische Heizkörpermassen für Trockenpressung Elektrische Heizkörpermassen wurden bisher in der Weise zusammengesetzt, daß ein wesentlicher Anteil an vorgebrannter Tonsubstanz von verschiedener Korngröße der keramischen Masse einverleibt wurde, um auf diese Weise genügende Temperaturwechselbeständigkeit sicherzustellen, weil ein solches Material plötzlicher Erhitzung und Abkühlung unterworfen wird. Eine derartige Anwesenheit von vorgebrannter Tonsubstanz, wobei vorzugsweise Tone von geringer Wärmeausdehnung zur Anwendung gelangen, hat sich als äußerst nützlich erwiesen, insbesondere wenn man einer solchen Masse wesentliche Anteile an Talkum, und zwar bis 35"/o, und mehr, hinzufügt. Dies hat seinen Grund in der Tatsache, daß Talkum einmal ein sehr weiches Material darstellt, andererseits vor allem, weil derartige Anteile von Talkum mit der vorhandenen Tonsubstanz ein Mineral, Cordierit,von der Zusammensetzung 2 Mg O, - 2 A12 03 -5 Si 02 im Brennprozeß bilden, das eine niedrige Wärmeausdehnung und daher gute Temperaturwechselbeständigkeit aufweist.Electrical radiator masses for dry pressing Up to now, electrical radiator masses have been composed in such a way that a substantial proportion of pre-fired clay substance of various grain sizes has been incorporated into the ceramic mass in order to ensure sufficient thermal shock resistance, because such a material is subjected to sudden heating and cooling. Such a presence of prefired clay substance, clays of low thermal expansion preferably being used, has proven to be extremely useful, especially when substantial amounts of talc, namely up to 35 "/ o and more, are added to such a mass its reason in the fact that talc is a very soft material on the one hand, on the other hand mainly because such proportions of talc with the existing clay substance form a mineral, cordierite, with the composition 2 Mg O, -2 A12 03 -5 Si 02 in the firing process form, which has a low thermal expansion and therefore good thermal shock resistance.
Solche Massen waren z. B. wie folgt zusammengesetzt: 20 bis 40% vorgebrannte Tonsubstanz von verschiedener Korngröße, 10 bis 40% Talkum oder ein anderes Magnesiumsilikat, 70 bis 0% plastifizierende Aluminiumsilikate in der Form von Tonen, 0 bis 20% Anteile an die Sinterung beeinflussenden Flußmitteln oder feuerfesten Stoffen oder von beiden.Such masses were z. B. composed as follows: 20 to 40% prefired Clay substance of various grain sizes, 10 to 40% talc or another magnesium silicate, 70 to 0% plasticizing aluminum silicates in the form of clays, 0 to 20% shares sintering-influencing fluxes or refractories or both.
Solange man nun Naßpressung in feuchter oder feuchter granulierter Masse als wesentliche Herstellungsmethode in Anwendung bringt, haben derartige Massezusammensetzungen zweifellos vollauf befriedigt. Indessen verlangen moderne Produktionsmethoden größere, d. h. schnellere Arbeitsleistungen und vor allem geringere Arbeitskosten. Dies hat es mit sich gebracht, daß man immer mehr vollständiges Trockenpressen, insbesondere auf Automnaten, bevorzugt, weil man hierdurch den kostspieligen Arbeitsaufwand ausschalten kann, der bei Naßpressen infolge der entstehenden Preßsäume an den Preßlingen auftritt, da diese ein langwieriges und kostspieliges Verputzen erfordern. Tatsächlich ist es möglich, jegliches Verputzen beim Trockenpressen zu vermeiden, weil bei trocken gepreßten Stücken keinerlei Preßsäume entstehen.As long as you now wet pressing in moist or moist granulated Bringing mass into use as an essential manufacturing method, have such mass compositions undoubtedly fully satisfied. Meanwhile, modern production methods require larger, d. H. faster work performance and, above all, lower labor costs. this has it brought with it that more and more complete dry pressing, in particular on vending machines, preferred because it eliminates the costly workload which occurs in wet pressing due to the resulting press seams on the compacts, as these require lengthy and costly plastering. Indeed it is it is possible to avoid any plastering when dry pressing, because when dry pressed pieces no press seams arise.
Nun ist es aber unmöglich, Massen, die vorgebrannte Tonsubstanz oder andere vorgebrannte feuerfeste Substanzen enthalten, insbesondere wenn diese, wie immer in solchen Fällen, in gröberen Partikeln verwendet werden, für Trockenpressung zu benutzen, weil sonst ihre harten Anteile die äußerst kostspieligen Matrizenwerkzeuge in kürzester Zeit abschleifen und unbrauchbar machen würden.But now it is impossible to mass, the pre-fired clay substance or contain other pre-burned refractory substances, especially if these, such as always in such cases, in coarser particles are used for dry pressing to use, because otherwise their hard parts make the extremely expensive die tools would be abraded in a very short time and rendered unusable.
Durch die Erfindung ist es nun gelungen, die Irin führung von vorgebrannter Substanz vollkommen entbehrlich zu -machen,. indem man den Prozentanteil dieser vorgebrannten--Bestandteile durch ein sehr weiches und in keiner Weise die Werkzeuge abschleifendes Material, nämlich Pyrophyllit, ersetzt, das ein Mineral der ungefähren. chemischen Zusammensetzung A12 03 - 4 Si 02 - H2 O darstellt. Dieses Mineral kommt in ausreichenden Mengen in einer Reihe von Ländern vor, besonders in den Vereinigten Staaten von Amerika, aber auch in Neufundland, Südafrika, Australien, Südkorea und Japan. Da dieses Mineral genau wie Ton ein Aluminiumsilikat darstellt, reagiert es auch mit dem anwesenden Magnesiums.ilikat Talkum in ganz ähnlicher Weise, indem es im Brennvorgang ebenfalls das Mineral Cordierit bildet und die Herstellung einer Masse mit geringer Wärmeausdehnung und somit ausgezeichneter Temperaturwechselbeständigkeit ermöglicht.Thanks to the invention, it has now been possible to introduce the irin of pre-fired Substance to be completely dispensable. by looking at the percentage of this pre-fired - ingredients by a very soft and in no way the tools abrasive material, namely pyrophyllite, which is a mineral of the approximate. chemical composition A12 03 - 4 Si 02 - H2 O represents. This mineral is coming in sufficient quantities in a number of countries, particularly the United States States of America, but also in Newfoundland, South Africa, Australia, and South Korea Japan. Since this mineral is an aluminum silicate just like clay, it reacts it also with the present magnesium silicate talc in a very similar way by adding it also forms the mineral cordierite in the firing process and the production of a Mass with low thermal expansion and thus excellent resistance to temperature changes enables.
Zusammen mit dem Talkum, das dem Pyrophyllit in seiner Weichheit sehr ähnlich ist, ist somit ein sehr hoher Prozentsatz sehr weicher Materialien, nämlich Talkum und Pyrophyllit, vereint, und zwar zu 30 bis 801/o in der Massezusammensetzung vorhanden, wenn man den Anteil an abschleifender, vorgebrannter Substanz durch den gleichen Anteil an Pyrophyllit ersetzt. Die folgenden Grenzen sollen in der Zusammensetzung für Massen gemäß der Erfindung zum Troekenp-ressen in Anwendung gelangen: 20! bis 40'% Pyrophyllit, 10 bis 40% Talkum, 0 bis 20,'0/a zusätzliche Substanzen, die entweder gls FIußmittel oder als feuerfeste Materialien für sich allein oder in Mischungen den Grad der Sinterung beeinflussen, 70 bis 0"/o plastifizierende Aluminiumsilikate in der Form von Tonen.Together with the talc, which is very similar to pyrophyllite in its softness, a very high percentage of very soft materials, namely talc and pyrophyllite, are combined, namely 30 to 801 / o in the composition of the mass, if the proportion of Abrasive, pre-burnt substance replaced by the same proportion of pyrophyllite. The following limits should be used in the composition for masses according to the invention for dry pressing: 20! Up to 40% pyrophyllite, 10 to 40% talc, 0 to 20, 0 / a additional substances which, either as fluxes or as refractory materials, alone or in mixtures, influence the degree of sintering, 70 to 0% plasticizing Aluminum silicates in the form of clays.
Als Flußmittel können kleinere Mengen Feldspat oder Erdalkalien, wie Verbindungen. von Calcium, Barium und Strontium, dienen oder noch besser Lithiummineralien,- wie Petalit, Spodumen, Lepidolith, weil derartige Mineralien eine geringere Wärmeausdehnung mit sich bringen.Small amounts of feldspar or alkaline earths, such as Links. of calcium, barium and strontium, serve or even better lithium minerals, like petalite, spodumene, lepidolite, because such minerals have a lower thermal expansion entail.
Als feuerfeste Substanzen dagegen können z. B. Bauxit, Sillimanit oder Zirkonsilikat verwendet werden, die eine gute Temperaturwechselbeständigkeit besitzen.As refractory substances, however, z. B. bauxite, sillimanite or zirconium silicate can be used, which have good thermal shock resistance own.
Ein geeignetes Mischungsverhältnis von Flußmitteln und feuerfesten Substanzen ist in den meisten Massezusammensetzungen wichtig, wobei aber Flußmittel wie auch feuerfeste Stoffe nur dazu dienen, den Grad der Sinterung der Masse entsprechend den Ofenbedingungen zu modifizieren.A suitable mixing ratio of fluxes and refractories Substance is important in most bulk compositions, but with flux as well as refractories only serve to match the degree of sintering of the mass to modify the furnace conditions.
Die so unter Zuhilfenahme von Pyrophyllit hergestellten Heizkörpermassen gemäß der Erfindung ermöglichen es also, das Trockenpreßverfahren in wesentlich schnellerer Produktion zu benutzen, ohne dabei Gefahr zu laufen, die kostspieligen Werkzeuge bei der automatischen Verpressung durch Abschleifen unbrauchbar zu machen.The radiator masses produced in this way with the aid of pyrophyllite according to the invention thus make it possible to use the dry pressing process in substantial to use faster production without running the risk of expensive ones To make tools unusable during automatic pressing by grinding.
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1400957A GB886718A (en) | 1957-05-02 | 1957-05-02 | Electrical refractories for dry pressing |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1061684B true DE1061684B (en) | 1959-07-16 |
Family
ID=10033343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEB48748A Pending DE1061684B (en) | 1957-05-02 | 1958-04-30 | Electric heater mass for dry pressing |
Country Status (2)
Country | Link |
---|---|
DE (1) | DE1061684B (en) |
GB (1) | GB886718A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3950175A (en) * | 1973-11-05 | 1976-04-13 | Corning Glass Works | Pore size control in cordierite ceramic |
US4001028A (en) * | 1974-05-28 | 1977-01-04 | Corning Glass Works | Method of preparing crack-free monolithic polycrystalline cordierite substrates |
RU2494995C2 (en) * | 2011-02-02 | 2013-10-10 | Николай Валентинович Стуценко | Mixture for producing cordierite ceramic |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE605237C (en) * | 1926-12-18 | 1934-11-07 | Felix Singer Dr Ing Dr | Process for reducing the expansion coefficient of all types of soapstone-containing ceramic masses and other ceramic masses with magnesium components |
-
1957
- 1957-05-02 GB GB1400957A patent/GB886718A/en not_active Expired
-
1958
- 1958-04-30 DE DEB48748A patent/DE1061684B/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE605237C (en) * | 1926-12-18 | 1934-11-07 | Felix Singer Dr Ing Dr | Process for reducing the expansion coefficient of all types of soapstone-containing ceramic masses and other ceramic masses with magnesium components |
Also Published As
Publication number | Publication date |
---|---|
GB886718A (en) | 1962-01-10 |
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