DE1918691A1 - Prodn of anisotropic permanent magnets by - wet compression of a grout - Google Patents
Prodn of anisotropic permanent magnets by - wet compression of a groutInfo
- Publication number
- DE1918691A1 DE1918691A1 DE19691918691 DE1918691A DE1918691A1 DE 1918691 A1 DE1918691 A1 DE 1918691A1 DE 19691918691 DE19691918691 DE 19691918691 DE 1918691 A DE1918691 A DE 1918691A DE 1918691 A1 DE1918691 A1 DE 1918691A1
- Authority
- DE
- Germany
- Prior art keywords
- grout
- bodies
- stillage
- mold
- prodn
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B3/00—Producing shaped articles from the material by using presses; Presses specially adapted therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/26—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor
- B28B1/265—Producing shaped prefabricated articles from the material by slip-casting, i.e. by casting a suspension or dispersion of the material in a liquid-absorbent or porous mould, the liquid being allowed to soak into or pass through the walls of the mould; Moulds therefor ; specially for manufacturing articles starting from a ceramic slip; Moulds therefor pressure being applied on the slip in the filled mould or on the moulded article in the mould, e.g. pneumatically, by compressing slip in a closed mould
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Dispersion Chemistry (AREA)
- Press-Shaping Or Shaping Using Conveyers (AREA)
- Manufacturing Cores, Coils, And Magnets (AREA)
Abstract
Description
Verfahren zur Herstellung von keramischen Körpern im Nasspressverfahren. Process for the production of ceramic bodies in the wet pressing process.
Die Erfindung betrifft die Herstellung von keramischen Körpern im Wasspressverfahren. Bei diesem Verfahren wird ein keramisches Pulver in einer Flüssigkeit aufgeschlämmt, die Schlempe in Pressformen eingefüllt und beim Pressen unter hohem Druck die Flüssigkeit durch poröse Filter auf den rressstempeln oder in der Wandung der Form abgefiltert, so daß verhältnismäßig dichte Presslinge mit geringem Feuchtigkeitsgehalt erhalten werden.The invention relates to the production of ceramic bodies in Water pressing process. In this process, a ceramic powder is placed in a liquid slurried, the pulp poured into molds and pressed under high Pressure the liquid through porous filters on the rress stamp or in the wall filtered off the mold, so that relatively dense compacts with low moisture content can be obtained.
Nach diesem bekannten Verfahren werden beispielsweise anisotrope Dauermagnetkörper erzeugt, wobei das Fressen in einem magnetischen Sichtfeld erfolgt, welches die in der Flüssigkeit suspendierten Pulverteilchen mit ihrer magnetischen Vorzugsachse in einer gewünschten Richtung ausrichtet.According to this known method, for example, anisotropic permanent magnet bodies are made generated, the fretting takes place in a magnetic field of view, which the powder particles suspended in the liquid with their easy magnetic axis aligns in a desired direction.
Die Erfindung bezweckt eine Beschleunigung dea Pressvorganges, der z. B. bei der Herstellung von Dauermagneten etwa 1 bis 3 Minuten dauert. Sie ist dadurch gekennzeichnet, daß das Pressen unter erhöhter Temperatur erfolgt, indem die Schlempe und/oder die Pressform angewärmt werden.The invention aims to accelerate the pressing process, the z. B. in the production of permanent magnets takes about 1 to 3 minutes. she is characterized in that the pressing takes place at elevated temperature by the stillage and / or the mold are heated.
Infolge der geringeren Viskosität der Suspensions-Flüssigkeit bei erhöhter Temperatur tritt die Flüssigkeit rascher durch die feinen Poren des Filters und des Presslings aus, so daß der Körper in kürzerer Zeit fertiggepresst ist.Due to the lower viscosity of the suspension liquid The liquid enters more quickly at higher temperatures through the fine Pores of the filter and the pressed part so that the body is finished pressed in a shorter time is.
Wird als Flüssigkeit Wasser verwendet, so richten sich die Pressseiten nach der Viskosität von Wasser. Diese beträgt: Temperatur Viskosität 20° C 1,005 Centipoise 40° C 0,654 " 60° C 0,470 " 80° C 0,356 " Aus einer beispielsweise auf 6000 erwärmten Schlempe wird daher das Wasser etwa doppelt so schnell abgefiltert als bei der üblichen Temperatur von 20°C. Die obengenannten Fresszeiten sinken daher auf 0,5 bis 1,5 Minuten.If water is used as the liquid, the press sides align according to the viscosity of water. This is: temperature viscosity 20 ° C 1.005 Centipoise 40 ° C 0.654 "60 ° C 0.470" 80 ° C 0.356 "Off an example 6000 heated stillage, the water is filtered out about twice as fast than at the usual temperature of 20 ° C. The above-mentioned feeding times therefore decrease to 0.5 to 1.5 minutes.
Zur Durchführung des erfindungsgemäßen Verfahrens wird zweckmäßigerweise die Schlempe im Vorratsgefäß auf erhöhter Temperatur gehalten. Die Schlempe kann auch auf dem Wege von diesem Vorratsgefäß zur Pressform erwärmt werden Schließlich kann die Pressform selbst erwärmt werden, um das erfindungsgemäße Verfahren durchzuführen. Die Erwärmung der Gefäße, Leitungen und der Form erfolgt in bekannter Weise, z.B. mit elektrischen Heizelementen oder mit Heißwasser oder -dampf.To carry out the method according to the invention, it is expedient the stillage is kept at an elevated temperature in the storage vessel. The stillage can Finally, they are also heated on the way from this storage vessel to the press mold the mold itself can be heated in order to carry out the method according to the invention. The vessels, pipes and the mold are heated in a known manner, e.g. with electric heating elements or with hot water or steam.
Das Verfahren hat sich besonders bewährt bei der Herstellung von Körpern aus magnetischen oder elektrischen Werkstoffen.The process has proven particularly useful in the manufacture of bodies made of magnetic or electrical materials.
Bei diesen wird eine hohe Dichte nur erzielt, wenn schon der Pressling bis auf einen geringen Feuchtigkeitsgehalt verdichtet wird. z.B. auf 10 bis 15 Gewichtsprozent Feuchtigkeit. Bei dieser hohen Pressdichte ist das Auspressen beziehungsweise Abfiltern der Flüssigkeit besonders schwierig, weil die Pulverteilchen sehr eng beieinander liegen und die Flüssigkeit nur schwer zwischen ihnen durchtreten kann. Durch das erfindungsgemäße Arbeiten bei -erhöhter Temperatur wird die Preßzeit erheblich verringert.With these, a high density is only achieved if the pellet is already in place is compacted to a low moisture content. e.g. to 10 to 15 percent by weight Humidity. At this high compression density, the pressing is respectively Filtering off the liquid is particularly difficult because the powder particles are very tight lie together and it is difficult for the liquid to pass between them. By working according to the invention at elevated temperature, the pressing time is considerable decreased.
Insbesonders kann das erfindungsgemäße Verfahren bei der Herstellung von anisotropen Magnetkörpern aus einer Schlempe von Wasser mit einem magnetischen Ferritpulver angewendet werden. Magnetische Ferritpulver können weichmagnetisch oder hartmagnetisch, d.h. dauermagnetisch sein. Dauermagnetische Ferritpulver, für deren Verarbeitung das erfindungsgemäße Verfahren empfohlen wird, besitzen die Zusammensetzung M0.6 Fe2O3, worin M für Metalle wie Barium, Strontium und/ oder Blei steht.In particular, the method according to the invention can be used in the production of anisotropic magnetic bodies from a stillage of water with a magnetic one Ferrite powder can be used. Magnetic ferrite powder can be soft magnetic or magnetically hard, i.e. permanently magnetic. Permanent magnetic ferrite powder, for the processing of which the method according to the invention is recommended have the composition M0.6 Fe2O3, where M stands for metals such as barium, strontium and / or lead.
Elektrische Werkstoffe, bei deren Verarbeitung das erfindungsgemäße Verfahren verwendet werden kann, sind zum Beispiel Barium-Titanate oder entprechende Verbindungen, die im Nasspressverfahren verarbeitet werden.Electrical materials, the processing of which according to the invention Methods that can be used are, for example, barium titanates or equivalent Connections that are processed using the wet pressing method.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691918691 DE1918691A1 (en) | 1969-04-12 | 1969-04-12 | Prodn of anisotropic permanent magnets by - wet compression of a grout |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19691918691 DE1918691A1 (en) | 1969-04-12 | 1969-04-12 | Prodn of anisotropic permanent magnets by - wet compression of a grout |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1918691A1 true DE1918691A1 (en) | 1971-02-04 |
Family
ID=5731042
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19691918691 Pending DE1918691A1 (en) | 1969-04-12 | 1969-04-12 | Prodn of anisotropic permanent magnets by - wet compression of a grout |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE1918691A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2531900A1 (en) * | 1982-08-20 | 1984-02-24 | Thuringia Sonneberg Veb | METHOD AND DEVICE FOR MANUFACTURING A SHEET-SHAPED BLEED CERAMIC MASS |
-
1969
- 1969-04-12 DE DE19691918691 patent/DE1918691A1/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2531900A1 (en) * | 1982-08-20 | 1984-02-24 | Thuringia Sonneberg Veb | METHOD AND DEVICE FOR MANUFACTURING A SHEET-SHAPED BLEED CERAMIC MASS |
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