Source: http://www.google.com/patents/US6607804?ie=ISO-8859-1&dq=5,581,513
Timestamp: 2015-05-06 00:52:01
Document Index: 483442778

Matched Legal Cases: ['art 1', 'art 2', 'arts 3', 'art 2', 'art 2', 'art 3', 'art 2', 'arts 2', 'art 2', 'art 2', 'art 2', 'art 3', 'art 3', 'art 3', 'art 3', 'art 1', 'arts 3', 'art 2', 'art 2', 'arts 3', 'arts 3', 'art 2', 'art 1', 'arts 3', 'art 2', 'art 16', 'arts 3', 'art 16']

Patent US6607804 - Molded part made of an electrically conductive ceramic and process for the ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA filter having two zones, the first zone having a low electrical conductivity and the second zone having a high electrical conductivity at electrode attachment zones due to infiltration of metal within the second zone....http://www.google.com/patents/US6607804?utm_source=gb-gplus-sharePatent US6607804 - Molded part made of an electrically conductive ceramic and process for the production of contact zones on such molded partsAdvanced Patent SearchPublication numberUS6607804 B1Publication typeGrantApplication numberUS 09/260,147Publication dateAug 19, 2003Filing dateMar 1, 1999Priority dateMar 9, 1998Fee statusLapsedAlso published asCA2264422A1, CA2264422C, DE19809976A1, DE19809976C2, EP0943593A1, EP0943593B1Publication number09260147, 260147, US 6607804 B1, US 6607804B1, US-B1-6607804, US6607804 B1, US6607804B1InventorsWalter Best, Oliver Benthaus, Wolfgang Sch�fer, Uwe SchumacherOriginal AssigneeThomas Josef Heimbach Gesellschaft Mit Beschrankter Haftung & Co.Export CitationBiBTeX, EndNote, RefManPatent Citations (30), Non-Patent Citations (2), Referenced by (3), Classifications (66), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetMolded part made of an electrically conductive ceramic and process for the production of contact zones on such molded parts
Under the concept metal�in elementary form and as a component of a ceramic compound�not only metallic, but also metal-like elements are meant in the sense of this description, for example metalloids. Involved here, besides silicon, are wolfram, tantalum, hafnium, zirconium, titanium, molybdenum, etc. The molded part itself can consist, e.g., of metal carbides (SiC, WC, TaC, HfC, ZrC, TiC), metal nitrides (ZrN, TiN), metal borides (TiB2, ZrB2) or silicides (MoSi2) Silicon carbide has proven especially useful.
The connection of the connecting parts to the core part can be performed, for example, by a material joining using active soldering (see M. Boretius, E. Lugschneider, Active Soldering�Material Joining of Ceramic Substances to Each Other and to Metal, VDI Berichte [Reports] No. 670, 1988). But instead there is also the possibility of materially connecting the connecting parts to the core part by a connecting layer made of electrically conductive ceramic, and suitably here also the ceramic of the molded part and of the connecting layer is the same. This yields secure, electrically conductive connection between the parts. Likewise, it can be recommended to make the connecting layer with pores finer than those of the molded part, to be able to infiltrate electrically conductive metal also into the connecting layer. In doing so, the contact resistance between the parts is kept low. Here it is entirely desirable that the metal infiltrated into the connecting parts is also partially infiltrated into the connecting layer.
According to another feature of the invention, it is provided that at least one connecting part has an attachment with contact zones. In particular, if the connecting parts form continuations of the core part, in this way the contact zones for attaching the electrodes can be relocated from the �hot� area of the core part to the cooler areas. The molding of the attachments can be done in any way according to the above-mentioned purpose. It is proposed that the attachments, like the connecting parts, be made of an electrically conductive ceramic with electrically conductive metal infiltrated into them, and specifically suitably of the same ceramic from which the connecting parts are also made, and infiltrated with the same metal. Connecting parts and attachments here can also be made of a uniform fitting. If this is not possible for reasons of production technology, the attachments can also be produced separately�suitably in the same work step as the connecting parts�and then be connected to the respective connecting part. The same processes that were described above for the connection of connecting parts and core part are involved here.
Molded part 1 represented in FIG. 1 consists of a core part 2 and two connecting parts 3 that form end parts and are intended, seen in the flow direction, for the end areas of core part 2 and only one of which is shown here. Core part 2 is a honeycomb and consequently has many flow-through channels extending in the lengthwise direction�designated for example by 4. Flow-through channels 4 are separated by porous partitions�designated for example by 5. Outer walls 6, 7 are also porous.
Connecting part 3 is made similar to core part 2 and forms, after connection of both parts 2, 3, a continuation of core part 2. It also has flow-through channels�designated by 8 for example�that lie coaxially to flow-through channels 4 in core part 2.
In any case each second flow-through channel 8 is closed by a plug or cover�designated by 9 for example�so that a chessboard-like pattern of closed and open flow-through channels 8 results. The connecting part not shown here and provided for the other end of core part 2 is made in the same way as an end part like connecting part 3, but with the difference that flow-through channels 8 that are open in connecting part 3 are closed and flow-through channels 8 that are closed in connecting part 3 are open. This way the gas stream flowing in by connecting part 3 is forced to flow through partitions 5, since only this way does it reach the flow-through channels that are open in the other connecting part. The flow through partitions 5 generates the filter effect of molded part 1.
After infiltration, connecting parts 3 are connected to core part 2. This can be done by active soldering. But there is also the possibility of providing the contact surfaces of core part 2 and connecting parts 3 with a paste made of silicon and�carbon powder�possibly also mixed with carbon-containing aids�and then placing connecting parts 3 on core part 2 and subjecting molded part 1 made this way to a reaction burn. The result is SiC, which enters a material connection with the SiC of connecting parts 3 and core part 2 during the reaction burn and thus takes care of a secure and additionally electrically conductive connection. To reduce the contact resistance, additional silicon can be infiltrated, for example by being present in the paste in hyperstoichiometric form.
In the embodiment according to FIG. 3, there is a one piece molded part 16 made of silicon carbide with a length of 30 cm, an edge length of 4 cm and a length resistance of 3 Ohms at room temperature. In the same way as with connecting parts 3 according to FIGS. 1 and 2, each second flow-through channel�designated by 17 for example�on the ends of molded part 16 is closed�by a cover, designated by 18 for example�so that here also a chessboard-like pattern of open and closed flow-through channels 17 is formed. Open flow-through channels 17 on the side shown are closed on the other side, while flow-through channels 17 provided with covers 18 are open on the other side.
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Boretius et al., "Aktivloten-Stoffschlussiges Fugen keramischer Werkstoffe untereinander und mit Metall", VDI Berichte, No. 670, 1988, pp. 699-713 No Month.2By M. Boretius et al., "Aktivloten�Stoffschlussiges Fugen keramischer Werkstoffe untereinander und mit Metall", VDI Berichte, No. 670, 1988, pp. 699-713 No Month.Referenced byCiting PatentFiling datePublication dateApplicantTitleUS7090714 *Jun 16, 2003Aug 15, 2006Hitachi Metals, Ltd.Ceramic honeycomb filterUS7578864 *Jul 14, 2004Aug 25, 2009Hitachi Metals, Ltd.Ceramic honeycomb filter and its production methodEP1801498A1 *Dec 23, 2005Jun 27, 2007Nederlandse Organisatie voor Toegepast-Natuuurwetenschappelijk Onderzoek TNOMethod for generating radiation* Cited by examinerClassifications U.S. Classification428/116, 428/306.6, 427/350, 427/124, 427/294, 427/383.5, 428/699, 428/539.5, 428/307.3, 428/174, 422/177, 428/469, 427/123, 427/375, 428/188, 55/523, 427/383.1, 428/304.4, 422/211, 427/376.7, 428/177, 427/372.2, 422/180, 427/376.3, 427/126.2International ClassificationF01N3/28, C04B38/00, F01N3/027, B01D71/02, B01J35/04, F01N3/022, F01N3/20, C04B41/88, F01N3/02, B01D46/42, B01J35/02, B01D39/20, B01D53/86, B01D46/00, B01D46/24Cooperative ClassificationY10T428/249953, Y10T428/249955, Y10T428/249956, B01D46/0001, Y10T428/24149, F01N3/2828, C04B2111/00793, C04B2111/94, Y10T428/24628, B01D46/2418, B01D46/0032, F01N3/0222, F01N3/027, Y02T10/26, C04B38/0006, F01N3/2013, Y10T428/24653, Y10T428/24744European ClassificationB01D46/24F8, F01N3/027, C04B38/00B, F01N3/022B, B01D46/00F30, F01N3/28B4B, B01D46/00B, F01N3/20B2Legal EventsDateCodeEventDescriptionOct 11, 2011FPExpired due to failure to pay maintenance feeEffective date: 20110819Aug 19, 2011LAPSLapse for failure to pay maintenance feesMar 28, 2011REMIMaintenance fee reminder mailedFeb 13, 2007FPAYFee paymentYear of fee payment: 4Mar 1, 1999ASAssignmentOwner name: THOMAS JOSEF HEIMBACH GESELLSCHAFT MIT BESCHRANKTEFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:BEST, WALTER;BENTHAUS, OLIVER;SCHAFER, WOLFGANG;AND OTHERS;REEL/FRAME:009824/0187;SIGNING DATES FROM 19990216 TO 19990217RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services