DE1646405B2 - PROCESS FOR MANUFACTURING ASBESTOS FELT SHAPED BODIES WITH ELASTIC PROPERTIES - Google Patents
PROCESS FOR MANUFACTURING ASBESTOS FELT SHAPED BODIES WITH ELASTIC PROPERTIESInfo
- Publication number
- DE1646405B2 DE1646405B2 DE19671646405 DE1646405A DE1646405B2 DE 1646405 B2 DE1646405 B2 DE 1646405B2 DE 19671646405 DE19671646405 DE 19671646405 DE 1646405 A DE1646405 A DE 1646405A DE 1646405 B2 DE1646405 B2 DE 1646405B2
- Authority
- DE
- Germany
- Prior art keywords
- asbestos
- metal salt
- felt
- heating
- elastic properties
- 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.)
- Granted
Links
- 239000010425 asbestos Substances 0.000 title claims description 20
- 229910052895 riebeckite Inorganic materials 0.000 title claims description 20
- 238000000034 method Methods 0.000 title claims description 12
- 238000004519 manufacturing process Methods 0.000 title claims description 4
- 229910052751 metal Inorganic materials 0.000 claims description 15
- 239000002184 metal Substances 0.000 claims description 15
- 238000010438 heat treatment Methods 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 10
- 150000003839 salts Chemical class 0.000 claims description 8
- 230000001590 oxidative effect Effects 0.000 claims description 6
- 238000005245 sintering Methods 0.000 claims description 6
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 230000003197 catalytic effect Effects 0.000 claims description 2
- 238000000354 decomposition reaction Methods 0.000 claims description 2
- 239000012266 salt solution Substances 0.000 claims description 2
- 239000002245 particle Substances 0.000 description 5
- YIXJRHPUWRPCBB-UHFFFAOYSA-N magnesium nitrate Chemical compound [Mg+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O YIXJRHPUWRPCBB-UHFFFAOYSA-N 0.000 description 4
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 4
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 229910001961 silver nitrate Inorganic materials 0.000 description 2
- NDVLTYZPCACLMA-UHFFFAOYSA-N silver oxide Chemical compound [O-2].[Ag+].[Ag+] NDVLTYZPCACLMA-UHFFFAOYSA-N 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000001311 chemical methods and process Methods 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000395 magnesium oxide Substances 0.000 description 1
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 239000000565 sealant Substances 0.000 description 1
- 229910001923 silver oxide Inorganic materials 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/009—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone characterised by the material treated
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/16—Making metallic powder or suspensions thereof using chemical processes
- B22F9/18—Making metallic powder or suspensions thereof using chemical processes with reduction of metal compounds
-
- 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
- C04B30/00—Compositions for artificial stone, not containing binders
- C04B30/02—Compositions for artificial stone, not containing binders containing fibrous materials
-
- 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
-
- 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
- C04B35/03—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite
- C04B35/04—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 magnesium oxide, calcium oxide or oxide mixtures derived from dolomite based on magnesium oxide
- C04B35/043—Refractories from grain sized mixtures
-
- 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
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
-
- 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
- C04B35/71—Ceramic products containing macroscopic reinforcing agents
- C04B35/78—Ceramic products containing macroscopic reinforcing agents containing non-metallic materials
- C04B35/80—Fibres, filaments, whiskers, platelets, or the like
- C04B35/82—Asbestos; Glass; Fused silica
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/5025—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials with ceramic materials
-
- 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
- C04B41/00—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone
- C04B41/45—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements
- C04B41/50—Coating or impregnating, e.g. injection in masonry, partial coating of green or fired ceramics, organic coating compositions for adhering together two concrete elements with inorganic materials
- C04B41/51—Metallising, e.g. infiltration of sintered ceramic preforms with molten metal
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/32—Metal oxides, mixed metal oxides, or oxide-forming salts thereof, e.g. carbonates, nitrates, (oxy)hydroxides, chlorides
- C04B2235/3289—Noble metal oxides
- C04B2235/3291—Silver oxides
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/30—Constituents and secondary phases not being of a fibrous nature
- C04B2235/44—Metal salt constituents or additives chosen for the nature of the anions, e.g. hydrides or acetylacetonate
- C04B2235/443—Nitrates or nitrites
-
- 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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/02—Composition of constituents of the starting material or of secondary phases of the final product
- C04B2235/50—Constituents or additives of the starting mixture chosen for their shape or used because of their shape or their physical appearance
- C04B2235/52—Constituents or additives characterised by their shapes
- C04B2235/5208—Fibers
- C04B2235/5216—Inorganic
- C04B2235/522—Oxidic
- C04B2235/5232—Silica or silicates other than aluminosilicates, e.g. quartz
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Filtering Materials (AREA)
- Catalysts (AREA)
Description
3535
Die Erfindung betrifft ein Verfahren zur Herstellung von Asbest-Filz-Formkörpern mit elastischen Eigenschaften, insbesondere Dichtungselementen.The invention relates to a process for the production of asbestos-felt moldings with elastic properties, in particular sealing elements.
Asbest-Filz wird bisweilen zum Abdichten der einzelnen Teile von Anordnungen verwendet, in den physikalische und chemische Prozesse ablaufen. Infolge der zum Teil verschiedenen Ausdehnungskoeffizienten von keramischen und metallischen Teilen ist es nämlich in vielen Fällen nicht möglich, diese Teile gas- und flüssigkeitsdicht durch Verschweißen oder Verlöten dauerhaft miteinander zu verbinden. Asbest-Filz hat den Nachteil, daß auf Grund seiner faserigen Struktur keine Dichtungsteile durch Pressen und Stanzen hergestellt werden können. Es ist auch nicht möglich, einen Dichtungsring geringer Breite und Dicke und großem Durchmesser herzustellen, der ein Abdichten gegen Gasaustritt gewährleistet. Es ist auch nicht ohne weiteres möglich, zwei Metallteile auf diese Weise gasdicht miteinander zu verbinden und gleichzeitig eine gute elektrische Leitfähigkeit dieser Verbindungsstelle zu gewährleisten.Asbestos felt is sometimes used to seal the individual parts of assemblies in the physical and chemical processes take place. As a result of the partly different expansion coefficients of Ceramic and metallic parts, in fact, in many cases it is not possible to make these parts gas- and liquid-tight to be permanently connected to one another by welding or soldering. Asbestos felt has that Disadvantage that due to its fibrous structure no sealing parts are made by pressing and punching can be. It is also not possible to use a sealing ring that is small in width and thickness and large Manufacture diameter that ensures a seal against gas leakage. Nor is it straightforward possible to connect two metal parts gas-tight in this way and at the same time a good one to ensure electrical conductivity of this connection point.
Die Erfindung stellt sich die Aufgabe, diese Nachteile zu beseitigen und zugleich die Materialeigenschaften des Asbest-Filzes in der Weise zu ändern, daß er elastisehe Eigenschaften, wie sie insbesondere bei Dichtungselementen erforderlich sind, erhält und je nach den Anforderungen ein Isolator oder ein elektrischer Leiter ist.The invention has the task of eliminating these disadvantages and at the same time the material properties to change the asbestos felt in such a way that it has elastic properties, such as those in sealing elements in particular are required and, depending on the requirements, an insulator or an electrical one Head is.
Das Verfahren nach der Erfindung ist dadurch gekennzeichnet, daß der Asbest-Fib: mit einer Metallsalzlösung getränkt, getrocknet und nach Zersetzung des Metallsalzes durch Erhitzen in oxydierender bzw. reduzierender bzw. inerter Atmosphäre zum Körper geformt wird. Zur weiteren Verbesserung der mechanischen Eigenschaften wird nach dem Erhitzen der Asbest-Filz-Körper pulverisiert und unter Sinterung zu Formkörpern geprelit. Ferner kann der Asbest-Filz-Körper insgesamt oder partiell zu einem Filter- bzw. zu einem Dichtungselement gepreßt werden. Bei dem erfindungsgemäßen Verfahren wird entweder das Metallsalz mittels Erhitzens in oxydierender Atmosphäre zu Metalloxid oder mittels Erhitzens in reduzierender bzw. inerter Atmosphäre zu Metall in dem Asbest-Filz-Körper zersetzt bzw. reduziert. Vorteilhaft kann bei dem erfindungsgemäßen Verfahren ein Metallsalz verwendet werden, welches dem Asbest-Filz-Körper zusätzliche katalytische Eigenschaften gibt.The method according to the invention is characterized in that the asbestos fib: with a metal salt solution soaked, dried and after decomposition of the metal salt by heating in oxidizing or reducing or inert atmosphere is formed into the body. To further improve the mechanical Properties is pulverized after heating the asbestos felt body and under sintering to it Moldings geprelit. Furthermore, the asbestos-felt body can be used in whole or in part as a filter or to be pressed a sealing element. In the process according to the invention, either the metal salt is used by heating in an oxidizing atmosphere to form metal oxide or by heating in a reducing atmosphere or an inert atmosphere decomposed or reduced to metal in the asbestos felt body. Can be advantageous at the method according to the invention, a metal salt can be used, which the asbestos felt body additional catalytic properties.
Das Metallsalz schlägt sich beim Entzug des Lösungsmittels auf der Oberfläche der einzelnen Filz-Partikeln nieder. Beim Sintern werden die teilweise oder ganz von dem betreffenden Metall bzw. Metalloxid umhüllten filzartigen Asbestteilchen an ihren Berührungsstellen untereinander verschweißt, dessen Porosität einerseits von der Duktilität des Metalls bzw. seines Oxides und andererseits von dem während des Sintems angewandten Druck und von der Temperatur abhängt. Bei hinreichend hohem Druck werden die einzelnen Partikeln derart miteinander verschweißt, daß der Formkörper gasundurchlässig wird.The metal salt hits the surface of the individual felt particles when the solvent is withdrawn low. During sintering, they are partially or completely encased by the metal or metal oxide in question Felt-like asbestos particles welded together at their points of contact, their porosity on the one hand from the ductility of the metal or its oxide and on the other hand from that during sintering applied pressure and temperature. If the pressure is high enough, the individual Particles are welded to one another in such a way that the molded body becomes impermeable to gas.
Das erfindungsgemäße Verfahren wird an folgenden Beispielen erläutert, ohne sich jedoch auf sie zu beschränken. The process according to the invention is illustrated by the following examples, without, however, being restricted to them.
Asbest-Filz wird mit einer Magnesiumnitratlösung getränkt, getrocknet, geformt und einige Stunden auf ungefähr 600°C in einer oxydierenden Atmosphäre erhitzt, wobei das Magnesiumnitrat sich zu Magnesiumoxid zersetzt. Der auf diese Weise entstandene poröse Körper ist verformbar und läßt sich durch Sintern unter Druck verdichten. Er kann beispielsweise zwischen den Flanschen zweier Rohrstutzen als Dichtungsring angeordnet sein. Falls der Formkörper als Scheibe ausgebildet ist, kann die innere, nicht verdichtete Zone als Filter zum Entfernen mechanischer Verunreinigungen dienen.Asbestos felt is soaked in a magnesium nitrate solution, dried, shaped and left on for a few hours Heated about 600 ° C in an oxidizing atmosphere, whereby the magnesium nitrate turns into magnesium oxide decomposed. The porous body produced in this way is deformable and can be undone by sintering Compress pressure. For example, it can act as a sealing ring between the flanges of two pipe sockets be arranged. If the molded body is designed as a disk, the inner, non-compressed zone can be used as a Filters are used to remove mechanical impurities.
Der Filz-Asbest wird mit Silbernitratlösung getränkt und nach seiner Trocknung in Luftatmosphäre auf 5000C erhitzt. Dabei wird das Silbernitrat zu Silberoxid und dieses weiter zu metallischem Silber zersetzt. Der imprägnierte Filz-Asbest-Körper ist verformbar und kann unter Druck verdichtet und durch anschließendes Pressen oder Stanzen beispielsweise zu stromleitenden Dichtungsringen verarbeitet werden.The felt asbestos is impregnated with silver nitrate solution and, after drying, is heated to 500 ° C. in an air atmosphere. The silver nitrate is broken down into silver oxide and this is further decomposed into metallic silver. The impregnated felt-asbestos body is deformable and can be compressed under pressure and then processed, for example, into electrically conductive sealing rings by pressing or punching.
Erfindungsgemäß kann der Filz-Asbest-Körper pulverisiert und in einer Preßform zu einem Formkörper, z. B. Ring oder Scheibe, gepreßt und durch Erhitzen unter Druck gesintert werden.According to the invention, the felt-asbestos body can be pulverized and in a compression mold to form a molded body, z. B. ring or disc, pressed and sintered by heating under pressure.
Derartige elektrisch leitende Filz-Asbest-Ringe bzw. -Scheiben können beispielsweise als Stromabnehmer und Dichtungsmittel in Hochtemperaturbrennstoffzellen dienen.Such electrically conductive felt-asbestos rings or washers can be used, for example, as current collectors and sealants are used in high temperature fuel cells.
Der gemäß Beispiel 2 hergestellte Filz-Asbest-Körper wird zu Partikeln von möglichst gleichem Durchmesser pulverisiert. Die Partikeln werden in eine durch eine Platte einseitig abgeschlossene zylinderförmigeThe felt-asbestos body produced according to Example 2 becomes particles of the same diameter as possible pulverized. The particles are formed into a cylindrical shape that is closed off on one side by a plate
Preßform gefüllt. Ein hohlzylinderförmiger Stempel verdichtet unter hohem Druck die Randzone des eingefüllten Materials, während ein weiterer zylir.derförmiger Stempel, der in den ersten eingeführt wird, den kreisförmigen innenbezirk leicht verdichtet. Der anschließend gesinterte Körper wirkt in seiner ringförmigen Randzone als gasundurchlässiger Dichtungsring und mit seinem Zentralteil als Filter.Filled mold. A hollow cylinder-shaped punch compresses the edge zone of the filled one under high pressure Material, while another cylindrical punch, which is inserted into the first, the circular inner district slightly compacted. The subsequently sintered body acts in its ring-shaped Edge zone as a gas-impermeable sealing ring and with its central part as a filter.
Die erfindungsgemäßen Formkörper können weiterhin nach dem Sintern durch Bohren oder DrehenThe shaped bodies according to the invention can also be used after sintering by drilling or turning
weiterverarbeitet werden oder durch Erhitzen auf bestimmte Temperaturen zusätzlich gehärtet bzw. verfestigt werden.further processed or additionally hardened or solidified by heating to certain temperatures will.
Die zulässige Arbeitstemperatur und die chemische Beständigkeit sowie andere physikalische und chemische Eigenschaften hängen in erster Linie von der Art der Imprägnierung ab. Beispielsweise können silberimprägnierte Formkörper bis 9000C, goldimprägnierte bis 10000C und platinimprägnierte bis 11000C in oxydierender Atmosphäre eingesetzt werden.The permissible working temperature and chemical resistance as well as other physical and chemical properties depend primarily on the type of impregnation. For example, silver impregnated shaped bodies can to 900 0 C, gold impregnated to 1000 0 C and platinum impregnated be used to 1100 0 C in an oxidizing atmosphere.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEB0091679 | 1967-03-18 | ||
| DEB0091679 | 1967-03-18 |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| DE1646405A1 DE1646405A1 (en) | 1971-07-15 |
| DE1646405B2 true DE1646405B2 (en) | 1976-03-25 |
| DE1646405C3 DE1646405C3 (en) | 1976-11-11 |
Family
ID=
Also Published As
| Publication number | Publication date |
|---|---|
| CH462023A (en) | 1968-08-31 |
| GB1184992A (en) | 1970-03-18 |
| FR1564946A (en) | 1969-04-25 |
| DE1646405A1 (en) | 1971-07-15 |
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