DE3916630A1 - Removing organic components from pressed oxide ceramic material - by heating in nitrogen-oxygen atmos. contg. low amt. of oxygen to prevent temp. differential between inner and outer areas of body - Google Patents
Removing organic components from pressed oxide ceramic material - by heating in nitrogen-oxygen atmos. contg. low amt. of oxygen to prevent temp. differential between inner and outer areas of bodyInfo
- Publication number
- DE3916630A1 DE3916630A1 DE3916630A DE3916630A DE3916630A1 DE 3916630 A1 DE3916630 A1 DE 3916630A1 DE 3916630 A DE3916630 A DE 3916630A DE 3916630 A DE3916630 A DE 3916630A DE 3916630 A1 DE3916630 A1 DE 3916630A1
- Authority
- DE
- Germany
- Prior art keywords
- oxygen
- organic components
- ceramic material
- oxide ceramic
- contg
- 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.)
- Withdrawn
Links
- 229910052574 oxide ceramic Inorganic materials 0.000 title claims abstract description 6
- 238000010438 heat treatment Methods 0.000 title claims description 6
- 229910052760 oxygen Inorganic materials 0.000 title claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title description 2
- 239000001301 oxygen Substances 0.000 title description 2
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 title 1
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000012298 atmosphere Substances 0.000 claims abstract description 7
- 238000003825 pressing Methods 0.000 claims abstract description 5
- 239000011230 binding agent Substances 0.000 claims abstract description 4
- 239000000314 lubricant Substances 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 6
- 239000004014 plasticizer Substances 0.000 claims description 3
- 238000005245 sintering Methods 0.000 claims description 2
- 239000004020 conductor Substances 0.000 abstract description 2
- 238000005336 cracking Methods 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 239000003795 chemical substances by application Substances 0.000 abstract 1
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920002451 polyvinyl alcohol Polymers 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical group [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 230000001603 reducing effect Effects 0.000 description 1
- 150000005846 sugar alcohols Polymers 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 229910001868 water Inorganic materials 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
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- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
- C04B35/63404—Polymers obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B35/63416—Polyvinylalcohols [PVA]; Polyvinylacetates
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/632—Organic additives
- C04B35/634—Polymers
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/626—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B
- C04B35/63—Preparing or treating the powders individually or as batches ; preparing or treating macroscopic reinforcing agents for ceramic products, e.g. fibres; mechanical aspects section B using additives specially adapted for forming the products, e.g.. binder binders
- C04B35/638—Removal thereof
-
- 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
- C04B35/622—Forming processes; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/64—Burning or sintering processes
-
- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/06—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by burning-out added substances by burning natural expanding materials or by sublimating or melting out added substances
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Magnetic Ceramics (AREA)
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Entbinderung bzw. Ent kohlung von Preßkörpern, bestehend aus feingemahlenen oxidkera mischen Werkstoffen, denen preßtechnisch bedingt organische Be standteile, nämlich Bindemittel, z.B. Polyviol, Preßhilfsmittel, insbesondere Gleitmittel und Weichmacher zugesetzt sind, die in einem der Sinterung ggf. getrennt vorgeschalteten Prozeß in O2-haltiger Atmosphäre ausgebrannt werden.The invention relates to a process for debinding or decarburization of compacts, consisting of finely ground oxide ceramics mixing materials to which, due to the pressing technology, organic constituents, namely binders, for example polyviol, pressing aids, in particular lubricants and plasticizers, are added, which may or may not be sintered. separately upstream process are burned out in an O 2 -containing atmosphere.
Beim Verpressen von oxidkeramischen Werkstoffen, insbesondere Werkstoffen für die Fertigung von Ferrit-, Heißleiter-, Kalt leiter- und Varistor-Bauelementen werden dem feingemahlenen Pul vergemisch in Form organischer Bestandteile die bereits erwähn ten Gleitmittel, Weichmacher und Bindemittel, z.B. Polyviole zugesetzt, welch letztes ein langkettier Polyalkohol ist, der im Temperaturbereich 200 bis 350°C unter Luftatmosphäre zu Wasser, Kohlendioxid, Kohlenmonoxid, Essigsäure und Formaldehyd ver brennt.When pressing oxide ceramic materials, in particular Materials for the production of ferrite, thermistor, cold conductor and varistor components are the finely ground Pul blended in the form of organic components that already mentioned lubricants, plasticizers and binders, e.g. Polyvioles added, the last one is a long-chain polyalcohol, which in the Temperature range 200 to 350 ° C under air atmosphere to water, Carbon dioxide, carbon monoxide, acetic acid and formaldehyde ver burns.
Die exotherme Reaktion führt dabei häufig zu einem Temperatur ungleichgewicht zwischen dem Innen- und Außenbereich des Preß körpers, was wiederum infolge unterschiedlicher Ausdehnung zur Rißbildung und damit zum Ausschuß von hochwertigen Bauelementen führen kann. Wesentliche Ursache hierfür ist, daß die im Innen bereich des Preßkörpers entwickelte Wärme infolge Isolation im Außenbereich nur ungenügend nach außen abgeführt werden kann und so die bereits angedeuteten Temperaturüberhöhungen im Preß körperinneren verursacht.The exothermic reaction often leads to a temperature imbalance between the inside and outside of the press body, which in turn due to different expansion to Cracking and thus the rejection of high-quality components can lead. The main reason for this is that the inside area of the compact developed heat due to insulation in Outside area can only be insufficiently discharged to the outside and so the already indicated temperature increases in the press caused inside the body.
Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Ver fahren der eingangs genannten Art anzugeben, das bei der Entbin derung das Temperaturungleichgewicht zwischen dem Innen- und Außenbereich des Preßkörpers und damit Rißbildungen im Preß körper weitgehend unterbindet.The present invention has for its object a Ver drive of the type mentioned at the outset the temperature imbalance between the inside and Outside of the press body and thus cracks in the press body largely prevented.
Zur Lösung dieser Aufgabe sieht die Erfindung vor, daß die Ent binderung in einem N2-O2-Gemisch mit maximal 20 Vol% O2, ins besondere 1 bis 18 Vol% O2 erfolgt, wobei der O2-Gehalt im Ge misch mit zunehmender Aufheizgeschwindigkeit geringer gewählt wird.To achieve this object, the invention provides that the Ent binding takes place in a N 2 -O 2 mixture with a maximum of 20 vol% O 2 , in particular 1 to 18 vol% O 2 , the O 2 content in the mixture is selected with increasing heating rate lower.
Es hat sich gezeigt, daß bei einer Entbinderung in dieser, in ihrem O2-Gehalt reduzierten Atmosphäre keine Temperaturüberhö hungen im Preßkörperinneren auftreten; d.h. daß die Entbin derung bzw. Entkohlung im Preßkörperinneren nicht rasch und da mit quasi nicht unter explosionsartiger Verbrennung des Sauerstoffs erfolgt.It has been shown that in the case of debinding in this atmosphere, which is reduced in its O 2 content, there are no temperature increases in the interior of the compact; that is, the debinding or decarburization in the interior of the compact does not take place quickly and with virtually no explosion of oxygen.
Was die Aufheizzeit und die hierzu in entsprechende Beziehung gesetzten O2-Gehalte im N2-O2-Gemisch betrifft, so ist beispiels weise bei einer Aufheizzeit von 5 Stunden (160 ... 350°C) ein O2-Gehalt von ca. 13 Vol% und bei einer Aufheizzeit von ca. 3 Stunden ein solcher von ca. 6 Vol% erforderlich.As for the heating time and this set in corresponding relationship O 2 content in the N 2 -O 2 mixture concerns, then example, at a heating time of 5 hours (160 ... 350 ° C), an O 2 content of ca 13 vol% and a heating time of approx. 3 hours requires approx. 6 vol%.
Reine Stickstoff-Atmosphäre bzw. eine Atmosphäre mit einem O2- Gehalt von weniger als 1 Vol% würde hingegen Kohlenstoffreste entstehen lassen, die beim anschließenden Sinterprozeß reduzie rend wirken und die magnetischen bzw. elektrischen Eigenschaften der oxidkeramischen Werkstoffe verschlechtern.A pure nitrogen atmosphere or an atmosphere with an O 2 content of less than 1% by volume, on the other hand, would leave carbon residues, which have a reducing effect in the subsequent sintering process and worsen the magnetic or electrical properties of the oxide-ceramic materials.
Claims (3)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3916630A DE3916630A1 (en) | 1989-05-22 | 1989-05-22 | Removing organic components from pressed oxide ceramic material - by heating in nitrogen-oxygen atmos. contg. low amt. of oxygen to prevent temp. differential between inner and outer areas of body |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE3916630A DE3916630A1 (en) | 1989-05-22 | 1989-05-22 | Removing organic components from pressed oxide ceramic material - by heating in nitrogen-oxygen atmos. contg. low amt. of oxygen to prevent temp. differential between inner and outer areas of body |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| DE3916630A1 true DE3916630A1 (en) | 1990-11-29 |
Family
ID=6381154
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3916630A Withdrawn DE3916630A1 (en) | 1989-05-22 | 1989-05-22 | Removing organic components from pressed oxide ceramic material - by heating in nitrogen-oxygen atmos. contg. low amt. of oxygen to prevent temp. differential between inner and outer areas of body |
Country Status (1)
| Country | Link |
|---|---|
| DE (1) | DE3916630A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4229316A1 (en) * | 1992-09-02 | 1994-03-03 | Siemens Matsushita Components | Mfr. of elongated ceramic bodies - by sintering assembly of adhesively-bonded part bodies. |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2650083A1 (en) * | 1976-10-30 | 1978-05-03 | Daimler Benz Ag | non-porous silicon nitride mouldings prodn. - by moulding silicon powder and silicone resin binder, opt. hardening and nitriding |
| DE2944029A1 (en) * | 1978-12-25 | 1980-07-03 | Tdk Electronics Co Ltd | METHOD FOR PRODUCING A SINTER BODY FROM CERAMIC MATERIAL FOR A VOLTAGE-RESISTANT RESISTANCE |
| DE2930847A1 (en) * | 1979-07-30 | 1981-02-19 | Nippon Crucible Co | Sintered silicon carbide body - formed without sintering aid, prepd. from silicon carbide powder contg. boron component |
| EP0276148A2 (en) * | 1987-01-20 | 1988-07-27 | Keramont Advanced Ceramic Products Corporation | Process for removing carbon or carbon compounds comprised in binders from non-oxide ceramics, and sintered bodies obtained therefrom |
| EP0276760A1 (en) * | 1987-01-27 | 1988-08-03 | Air Products And Chemicals, Inc. | A CO2 copolymer binder for forming ceramic bodies and a shaping process using the same |
| EP0216436B1 (en) * | 1985-09-26 | 1989-04-26 | "Studiecentrum voor Kernenergie", "S.C.K." | Method for manufacturing a sintered product |
-
1989
- 1989-05-22 DE DE3916630A patent/DE3916630A1/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2650083A1 (en) * | 1976-10-30 | 1978-05-03 | Daimler Benz Ag | non-porous silicon nitride mouldings prodn. - by moulding silicon powder and silicone resin binder, opt. hardening and nitriding |
| DE2944029A1 (en) * | 1978-12-25 | 1980-07-03 | Tdk Electronics Co Ltd | METHOD FOR PRODUCING A SINTER BODY FROM CERAMIC MATERIAL FOR A VOLTAGE-RESISTANT RESISTANCE |
| DE2930847A1 (en) * | 1979-07-30 | 1981-02-19 | Nippon Crucible Co | Sintered silicon carbide body - formed without sintering aid, prepd. from silicon carbide powder contg. boron component |
| EP0216436B1 (en) * | 1985-09-26 | 1989-04-26 | "Studiecentrum voor Kernenergie", "S.C.K." | Method for manufacturing a sintered product |
| EP0276148A2 (en) * | 1987-01-20 | 1988-07-27 | Keramont Advanced Ceramic Products Corporation | Process for removing carbon or carbon compounds comprised in binders from non-oxide ceramics, and sintered bodies obtained therefrom |
| EP0276760A1 (en) * | 1987-01-27 | 1988-08-03 | Air Products And Chemicals, Inc. | A CO2 copolymer binder for forming ceramic bodies and a shaping process using the same |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4229316A1 (en) * | 1992-09-02 | 1994-03-03 | Siemens Matsushita Components | Mfr. of elongated ceramic bodies - by sintering assembly of adhesively-bonded part bodies. |
| DE4229316C2 (en) * | 1992-09-02 | 1998-08-13 | Siemens Matsushita Components | Process for the production of elongated ceramic bodies of any geometric shape |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| OM8 | Search report available as to paragraph 43 lit. 1 sentence 1 patent law | ||
| 8139 | Disposal/non-payment of the annual fee |