DE4102249A1 - Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machining - Google Patents
Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machiningInfo
- Publication number
- DE4102249A1 DE4102249A1 DE19914102249 DE4102249A DE4102249A1 DE 4102249 A1 DE4102249 A1 DE 4102249A1 DE 19914102249 DE19914102249 DE 19914102249 DE 4102249 A DE4102249 A DE 4102249A DE 4102249 A1 DE4102249 A1 DE 4102249A1
- Authority
- DE
- Germany
- Prior art keywords
- silicon carbide
- workpieces
- electrically conductive
- during sintering
- 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.)
- Withdrawn
Links
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
-
- 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
- C04B41/0072—Heat treatment
-
- 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
- C04B41/80—After-treatment of mortars, concrete, artificial stone or ceramics; Treatment of natural stone of only ceramics
Abstract
Description
Die Erfindung betrifft ein Verfahren zur Erzeugung einer elektrisch leitenden Randzone bei Werkstücken aus gesinter ter Siliziumkarbidkeramik, die keine bzw. eine niedrige elektrische Leitfähigkeit aufweist.The invention relates to a method for generating a electrically conductive edge zone for sintered workpieces ter silicon carbide ceramics that have no or a low has electrical conductivity.
Um Siliciumkarbidwerkstoffe elektroerosiv zu bearbeiten, muß eine für dieses Verfahren erforderliche elektrisch leitende Startschicht mit einer Mindestleitfähigkeit von 10 bis 100 mS/cm vorhanden sein. Diese Startschicht wurde bisher auf das Siliziumkarbid-Keramikbauteil nach dem Sintervorgang aufgetragen. Dafür finden unterschiedliche Technologien Einsatz, beispielsweise erfolgt der Auftrag einer elektrisch leitenden Silberschicht. Andere Lösungen gehen von einer Erhöhung der elektrischen Leitfähigkeit des Werkstoff-Grund gefüges durch Einbringen einer elektrisch leitenden Phase aus, die wie auch das Auftragen einer elektrisch leitenden Startschicht einen hohen zusätzlichen technologischen Auf wand erfordert und die physikalisch-mechanischen Eigen schaften des Grundwerkstoffes negativ beeinflußt.In order to machine silicon carbide materials electro-erosively an electrically conductive required for this process Starting layer with a minimum conductivity of 10 to 100 mS / cm to be available. This starting layer has been on so far the silicon carbide ceramic component after the sintering process applied. There are different technologies for this Use, for example, is applied electrically conductive silver layer. Other solutions start from one Increasing the electrical conductivity of the material base structure by introducing an electrically conductive phase from that as well as applying an electrically conductive Start shift a high additional technological opening wall requires and the physical-mechanical properties properties of the base material are negatively affected.
Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zur Erhöhung der elektrischen Leitfähigkeit der Randzone zu entwickeln, welches ohne zusätzlichen technologischen Aufwand durchge führt werden kann und eine Beeinträchtigung der physika lisch-mechanischen Eigenschaften des Grundwerkstoffes ver meidet.The invention has for its object a method for increasing to develop the electrical conductivity of the peripheral zone, which goes through without additional technological effort can lead and an impairment of the physika mechanical-mechanical properties of the base material ver avoids.
Diese Aufgabe wird erfindungsgemäß durch eine zusätzliche Haltezeit von 60 bis 150 Minuten bei einer Temperatur von 1900°C bis 2150°C während des Sintervorganges der Silizium karbid-Keramik gelöst. Dadurch entsteht eine besser leitende kohlenstoffangereicherte Randschicht, die mehrere Mikrometer beträgt. Somit besteht die Möglichkeit, während der Werk stoffherstellung die Voraussetzung für eine effektive elek troerosive Bearbeitung zu schaffen. Die auf dem Bauteil verbleibende kohlenstoffangereicherte Randschicht kann sich nachteilig auf bestimmte Anwendungsrichtungen auswirken. Die Erfindung wird nachfolgend an einem Ausführungsbeispiel näher erläutert.This object is achieved by an additional Holding time of 60 to 150 minutes at a temperature of 1900 ° C to 2150 ° C during the sintering process of the silicon carbide ceramic dissolved. This creates a more conductive carbon-enriched surface layer that is several micrometers is. So there is a possibility during the work fabric production is the prerequisite for effective elec to create troerosive machining. The one on the component remaining carbon-enriched surface layer can become adversely affect certain application directions. The invention is described below using an exemplary embodiment explained in more detail.
Voraussetzung für die elektroerosive Bearbeitung von Werk stücken aus gesinterter Siliziumkarbid-Keramik, die keine bzw. eine geringe elektrische Leitfähigkeit aufweist, bildet die Präparation der Werkstücke mit einer elektrisch leiten den Randschicht. Das geschieht im Gegensatz zu anderen Be schichtungsverfahren, die einen zusätzlichen technologischen Aufwand darstellen, während der Herstellung der Werkstücke aus Siliziumkarbid-Keramik. Dafür wird der Sinterprozeß im Vakuum-Sinterofen durch eine zusätzliche Haltezeit, bei spielsweise während der Abkühlphase mit einem Temperatur regime von 1900°C bis 2150°C modifiziert. Infolge des Ab dampfens von Silizium entsteht eine kohlenstoffangereicherte Randschicht. Bei einer Variation der Haltedauer von 60 bis 150 Minuten kann die Randschicht eine elektrische Leitfähig keit von größer als 2 S/cm erreichen. Diese gut elektrisch leitende Kohlenstoffschicht übernimmt den Transport der Ladungsträger als Voraussetzung für eine elektroerosive Bearbeitung dieser Werkstücke aus gesinterter Silizium karbid-Keramik.A prerequisite for electro-erosive machining at the factory pieces of sintered silicon carbide ceramics that none or has a low electrical conductivity conduct the preparation of the workpieces with an electric one the boundary layer. In contrast to other Be stratification processes that add an additional technological Represent effort during the manufacture of the workpieces made of silicon carbide ceramic. For this, the sintering process in Vacuum sintering furnace due to an additional holding time for example during the cooling phase with a temperature Modified from 1900 ° C to 2150 ° C. As a result of Ab vaporization of silicon creates a carbon-enriched Boundary layer. With a variation of the holding period from 60 to The surface layer can be electrically conductive for 150 minutes reach greater than 2 S / cm. This well electric conductive carbon layer takes over the transport of the Charge carriers as a prerequisite for an electroerosive Processing of these sintered silicon workpieces carbide ceramic.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914102249 DE4102249A1 (en) | 1991-01-23 | 1991-01-23 | Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machining |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19914102249 DE4102249A1 (en) | 1991-01-23 | 1991-01-23 | Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machining |
Publications (1)
Publication Number | Publication Date |
---|---|
DE4102249A1 true DE4102249A1 (en) | 1992-07-30 |
Family
ID=6423727
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19914102249 Withdrawn DE4102249A1 (en) | 1991-01-23 | 1991-01-23 | Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machining |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE4102249A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6319729B1 (en) | 1998-10-12 | 2001-11-20 | Sensonor Asa | Method for manufacturing an angular rate sensor |
-
1991
- 1991-01-23 DE DE19914102249 patent/DE4102249A1/en not_active Withdrawn
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6319729B1 (en) | 1998-10-12 | 2001-11-20 | Sensonor Asa | Method for manufacturing an angular rate sensor |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
DE69937324T2 (en) | Micro-discharge dresser and finishing method using this device | |
DE3703498C2 (en) | ||
EP0182377A2 (en) | Process for making a thin film capacitor | |
CH694156A5 (en) | Treating surface of die by discharge surface treatment using a green compact profile die electrode produced by filling a female die with a material powder, e.g. a metal powder, and compacting the powder | |
DE1200403B (en) | Method for producing an electrically insulating layer between two thin, electrically conductive layers | |
DE4102250A1 (en) | Electro-erosion - uses dielectric contg. carbon@ to give constant conductive working edge zone on workpieces of low or no electrical conductivity | |
DE4102249A1 (en) | Conductive surface prodn. on silicon carbide workpiece - during sintering, to allow direct electro-erosion machining | |
DE2331004B2 (en) | Induction heating coil for crucible-free zone melting | |
DE2650589C2 (en) | Process for the electrolytic production of metal cathodes, in particular copper cathodes | |
DE645672C (en) | Process for producing the cutting edges of cutting tools with a soft base material by means of electric arc welding | |
DE2743061A1 (en) | Prodn. of dry electrolyte capacitor with tantalum anode - involves pressed and sintered tantalum powder anode dipped in metal ions contg. soln. and thermally treated | |
DE442366C (en) | Process for the production of electrical press insulation compounds with embedded metal parts | |
DE1257527B (en) | Process for applying a layer consisting of an alloy to a carrier material | |
DE1065473B (en) | ||
DE1041410B (en) | Process for the production of bodies from sintered hard materials | |
DE692461C (en) | Process for the production of bodies consisting of a single crystal or of large crystals from refractory metals | |
DE966105C (en) | Process for applying metals, in particular solder alloys, to hard metals | |
AT233674B (en) | Method of making a stabilized metal film resistor | |
DE1184423B (en) | Method for producing a protective layer on a semiconductor component | |
DE1230915B (en) | Process for the production of integrated semiconductor components | |
DE665709C (en) | Process for the production of workpieces which are provided with hard metal supports | |
DE2605281A1 (en) | METHOD OF MANUFACTURING A SEMICONDUCTOR DEVICE | |
DE554488C (en) | Process for heat transfer by means of an electric arc generated in a dissociated hydrogen atmosphere, used for cutting metals | |
DE1901150C (en) | Superconducting device and method for making the same | |
DE868198C (en) | Dry rectifier |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
8122 | Nonbinding interest in granting licenses declared | ||
8139 | Disposal/non-payment of the annual fee | ||
8127 | New person/name/address of the applicant |
Owner name: PILZ, ROLF, DR.RER.NAT., 09130 CHEMNITZ, DE MUELLE |
|
8170 | Reinstatement of the former position | ||
8139 | Disposal/non-payment of the annual fee |