US20070218284A1 - Graphite product and its fabrication method - Google Patents

Graphite product and its fabrication method Download PDF

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Publication number
US20070218284A1
US20070218284A1 US11/377,197 US37719706A US2007218284A1 US 20070218284 A1 US20070218284 A1 US 20070218284A1 US 37719706 A US37719706 A US 37719706A US 2007218284 A1 US2007218284 A1 US 2007218284A1
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US
United States
Prior art keywords
graphite
metal coating
fabrication method
layer
blank
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.)
Abandoned
Application number
US11/377,197
Inventor
Hung-Yi Wu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lotes Co Ltd
Original Assignee
Lotes Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Lotes Co Ltd filed Critical Lotes Co Ltd
Priority to US11/377,197 priority Critical patent/US20070218284A1/en
Assigned to LOTES CO., LTD. reassignment LOTES CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: WU, HUNG-YI
Publication of US20070218284A1 publication Critical patent/US20070218284A1/en
Abandoned legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D3/00—Electroplating: Baths therefor
    • C25D3/02—Electroplating: Baths therefor from solutions
    • C25D3/38—Electroplating: Baths therefor from solutions of copper
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25D—PROCESSES FOR THE ELECTROLYTIC OR ELECTROPHORETIC PRODUCTION OF COATINGS; ELECTROFORMING; APPARATUS THEREFOR
    • C25D7/00—Electroplating characterised by the article coated
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/30—Self-sustaining carbon mass or layer with impregnant or other layer

Definitions

  • the present invention relates to a graphite product.
  • the invention relates also to a method of fabricating a graphite product.
  • graphite is being intensively used in different electronic devices.
  • Conventional graphite products are made by: press-molding graphite into the designed shape and then processing the shaped graphite with a high temperature processing process, for example, baking.
  • a graphite product, for example, a heat sink or terminal for electric connector made according to the aforesaid conventional graphite product fabrication method is still not satisfactory in function.
  • Conventional graphite products are not durable in use because they tend to disperse graphite powder dust. Further, the color of conventional graphite products fades quickly.
  • the present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a graphite product, which prevents dispersion of graphite powder dust, thereby providing a nice outer looking. It is another object of the present invention to provide a graphite product fabrication method, which is practical to make a graphite product that prevents dispersion of graphite powder dust.
  • the graphite fabrication method includes the steps of (1) using a press mold to mold graphite into a graphite blank, (2) processing the graphite blank to set the shape of the graphite blank, and (3) covering the surface of the graphite blank with a layer of metal coating.
  • a graphite product according to the present invention comprises a graphite body and a layer of metal coating covered on the surface of the graphite body. The layer of metal coating prevents dispersion of graphite powder dust.
  • FIG. 1 is an oblique top elevation of a heat sink made according to the present invention.
  • FIG. 2 is an oblique bottom elevation of the heat sink shown in FIG. 1 .
  • FIG. 3 is a schematic drawing showing an electric connector made according to the present invention and connected to a matching electric connector.
  • FIG. 4 is a graphite product manufacturing flow chart.
  • a graphite product in accordance with a first embodiment of the present invention is a heat sink.
  • the heat sink has a graphite body 1 and a metal coating (not shown) on the surface of the graphite body 1 .
  • the graphite body 1 has a flat base 10 and a plurality of radiating fins 11 arranged at the top side of the flat base 10 .
  • the bottom surface of the graphite body 1 is a heat transferring surface 12 for transferring heat from an electronic or semiconductor device.
  • the other surface of the graphite body 1 forms a heat dissipation surface 13 adapted to dissipate heat into the outside open air.
  • the metal coating is covered on the heat dissipation surface 13 (It is workable that the metal coating covers the whole surface of the graphite body 1 ).
  • the metal coating can be formed of copper, gold, or aluminum.
  • the metal coating is formed of copper and covered on the heat dissipation surface 13 of the graphite body 1 by electroplating. The metal coating enhances the heat dissipation power of the graphite body I and prohibits dispersion of graphite powder dust, thereby maintaining the nice outer looking of the heat sink.
  • FIG. 3 shows an electric connector constructed in accordance with a second embodiment of the present invention and connected to a matching electric connector (or an electronic apparatus).
  • the electric connector comprises an electrically insulative housing 2 , and a plurality of conducting terminals 21 mounted in the housing 2 .
  • the conducting terminals 21 are made out of graphite and peripherally covered with a layer of copper coating.
  • the conducting terminals 21 have a cylindrical shape, and are kept in contact with respective conducting terminals 31 of a matching electric connector (or electronic apparatus).
  • the copper coating coated on the surface of each conducting terminal 21 enhances the conductivity and prevents dispersion of graphite powder dust, thereby maintaining the nice outer looking of the respective conducting terminal.
  • a graphite product fabrication method in accordance with the present invention includes the steps of (1) using a mold to mold graphite into a graphite blank, (2) processing the graphite blank with a high pressure processing process to set the shape of the graphite blank, and (3) electroplating the surface of the graphite blank with a layer of copper coating.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

A graphite product fabrication method includes the steps of (1) using a press mold to mold graphite into a graphite blank, (2) processing the graphite blank to set the shape of the graphite blank, and (3) covering the surface of the graphite blank with a layer of metal coating.

Description

    BACKGROUND OF THE INVENTION
  • (a) Field of the Invention
  • The present invention relates to a graphite product. The invention relates also to a method of fabricating a graphite product.
  • (b) Description of the Prior Art
  • Following fast development of electronic technology, graphite is being intensively used in different electronic devices. Conventional graphite products are made by: press-molding graphite into the designed shape and then processing the shaped graphite with a high temperature processing process, for example, baking. A graphite product, for example, a heat sink or terminal for electric connector made according to the aforesaid conventional graphite product fabrication method is still not satisfactory in function. Conventional graphite products are not durable in use because they tend to disperse graphite powder dust. Further, the color of conventional graphite products fades quickly.
  • Therefore, it is desirable to provide a graphite fabrication method that eliminates the aforesaid problems.
    • SUMMARY OF THE INVENTION
  • The present invention has been accomplished under the circumstances in view. It is the main object of the present invention to provide a graphite product, which prevents dispersion of graphite powder dust, thereby providing a nice outer looking. It is another object of the present invention to provide a graphite product fabrication method, which is practical to make a graphite product that prevents dispersion of graphite powder dust.
  • According to the present invention, the graphite fabrication method includes the steps of (1) using a press mold to mold graphite into a graphite blank, (2) processing the graphite blank to set the shape of the graphite blank, and (3) covering the surface of the graphite blank with a layer of metal coating. A graphite product according to the present invention comprises a graphite body and a layer of metal coating covered on the surface of the graphite body. The layer of metal coating prevents dispersion of graphite powder dust.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is an oblique top elevation of a heat sink made according to the present invention.
  • FIG. 2 is an oblique bottom elevation of the heat sink shown in FIG. 1.
  • FIG. 3 is a schematic drawing showing an electric connector made according to the present invention and connected to a matching electric connector.
  • FIG. 4 is a graphite product manufacturing flow chart.
    • DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
  • Referring to FIGS. 1 and 2, a graphite product in accordance with a first embodiment of the present invention is a heat sink. The heat sink has a graphite body 1 and a metal coating (not shown) on the surface of the graphite body 1. The graphite body 1 has a flat base 10 and a plurality of radiating fins 11 arranged at the top side of the flat base 10. The bottom surface of the graphite body 1 is a heat transferring surface 12 for transferring heat from an electronic or semiconductor device. The other surface of the graphite body 1 forms a heat dissipation surface 13 adapted to dissipate heat into the outside open air. According to this embodiment, the metal coating is covered on the heat dissipation surface 13 (It is workable that the metal coating covers the whole surface of the graphite body 1). The metal coating can be formed of copper, gold, or aluminum. According to this embodiment, the metal coating is formed of copper and covered on the heat dissipation surface 13 of the graphite body 1 by electroplating. The metal coating enhances the heat dissipation power of the graphite body I and prohibits dispersion of graphite powder dust, thereby maintaining the nice outer looking of the heat sink.
  • FIG. 3 shows an electric connector constructed in accordance with a second embodiment of the present invention and connected to a matching electric connector (or an electronic apparatus). The electric connector comprises an electrically insulative housing 2, and a plurality of conducting terminals 21 mounted in the housing 2. The conducting terminals 21 are made out of graphite and peripherally covered with a layer of copper coating. The conducting terminals 21 have a cylindrical shape, and are kept in contact with respective conducting terminals 31 of a matching electric connector (or electronic apparatus). The copper coating coated on the surface of each conducting terminal 21 enhances the conductivity and prevents dispersion of graphite powder dust, thereby maintaining the nice outer looking of the respective conducting terminal.
  • Referring to FIG. 4, a graphite product fabrication method in accordance with the present invention includes the steps of (1) using a mold to mold graphite into a graphite blank, (2) processing the graphite blank with a high pressure processing process to set the shape of the graphite blank, and (3) electroplating the surface of the graphite blank with a layer of copper coating.
  • Although particular embodiments of the invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the invention. Accordingly, the invention is not to be limited except as by the appended claims.

Claims (10)

1. A graphite product fabrication method comprising the steps of (1) using a mold to mold graphite into a graphite blank, (2) processing said graphite blank to set the shape of said graphite blank, and (3) covering the surface of said graphite blank with a layer of metal coating.
2. The graphite product fabrication method as claimed in claim 1, wherein a high pressure and high temperature processing process is employed during step (2) to set the shape of said graphite blank.
3. The graphite product fabrication method as claimed in claim 1, wherein said layer of metal coating is formed of a metal material having a high heat transfer coefficient.
4. The graphite product fabrication method as claimed in claim 1, wherein said layer of metal coating is formed of a metal material having a high conducting power.
5. The graphite product fabrication method as claimed in claim 1, wherein said layer of metal coating is formed of copper.
6. The graphite product fabrication method as claimed in claim 1, wherein said layer of metal coating is covered on the surface of said graphite blank by electroplating.
7. A graphite product comprising a graphite body and a metal coating covered on the surface of said graphite body.
8. The graphite product as claimed in claim 7, wherein said layer of metal coating is formed of a metal material having a high heat transfer coefficient.
9. The graphite product as claimed in claim 7, wherein said layer of metal coating is formed of copper.
10. The graphite product as claimed in claim 7, wherein said layer of metal coating is covered on the surface of said graphite body by electroplating.
US11/377,197 2006-03-17 2006-03-17 Graphite product and its fabrication method Abandoned US20070218284A1 (en)

Priority Applications (1)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090218070A1 (en) * 2007-03-07 2009-09-03 Audi Ag Heat Exchange Device and Method for Producing a Heat Exchange Element for a Heat Exchange Device
US20100243230A1 (en) * 2009-03-25 2010-09-30 Wah Hong Industrial Corp. Heat-dissipating device including a plating metal layer
US20110214851A1 (en) * 2009-08-14 2011-09-08 Wah Hong Industrial Corp. Use of a graphite heat-dissipation device including a plating metal layer
CN105706541A (en) * 2013-10-29 2016-06-22 保力马科技(日本)株式会社 Liquid-filled heat dissipation member
US9609738B1 (en) * 2013-12-23 2017-03-28 Flextronics Ap, Llc Graphite sheet to redirect SMT components during thermal exposure
CN109755104A (en) * 2017-11-01 2019-05-14 天津环鑫科技发展有限公司 A kind of raising chip freezes production capacity technique in advance

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6131651A (en) * 1998-09-16 2000-10-17 Advanced Ceramics Corporation Flexible heat transfer device and method
US20020166654A1 (en) * 2001-05-02 2002-11-14 Smalc Martin D. Finned Heat Sink Assemblies
US20020167800A1 (en) * 2001-05-02 2002-11-14 Smalc Martin D. Radial Finned Heat Sink
US6907917B2 (en) * 2003-01-10 2005-06-21 International Business Machines Corporation Graphite-based heat sinks and method and apparatus for the manufacture thereof
US20060230615A1 (en) * 2005-04-13 2006-10-19 Mr. Kai-Yu Lin [graphite base for heat sink, method of making graphite base and heat sink]

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6131651A (en) * 1998-09-16 2000-10-17 Advanced Ceramics Corporation Flexible heat transfer device and method
US20020166654A1 (en) * 2001-05-02 2002-11-14 Smalc Martin D. Finned Heat Sink Assemblies
US20020167800A1 (en) * 2001-05-02 2002-11-14 Smalc Martin D. Radial Finned Heat Sink
US6907917B2 (en) * 2003-01-10 2005-06-21 International Business Machines Corporation Graphite-based heat sinks and method and apparatus for the manufacture thereof
US20060230615A1 (en) * 2005-04-13 2006-10-19 Mr. Kai-Yu Lin [graphite base for heat sink, method of making graphite base and heat sink]

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090218070A1 (en) * 2007-03-07 2009-09-03 Audi Ag Heat Exchange Device and Method for Producing a Heat Exchange Element for a Heat Exchange Device
US20130019478A1 (en) * 2008-03-07 2013-01-24 Benedikt Fries Heat Exchange Device and Method for Producing a Heat Exchange Element for a Heat Exchange Device
US20100243230A1 (en) * 2009-03-25 2010-09-30 Wah Hong Industrial Corp. Heat-dissipating device including a plating metal layer
US20120132404A1 (en) * 2009-03-25 2012-05-31 Wah Hong Industrial Corp. Use of a graphite heat-dissipation device including a plating metal layer
US9097468B2 (en) * 2009-03-25 2015-08-04 Wah Hong Industrial Corp. Use of a graphite heat-dissipation device including a plating metal layer
US20110214851A1 (en) * 2009-08-14 2011-09-08 Wah Hong Industrial Corp. Use of a graphite heat-dissipation device including a plating metal layer
US8955580B2 (en) * 2009-08-14 2015-02-17 Wah Hong Industrial Corp. Use of a graphite heat-dissipation device including a plating metal layer
CN105706541A (en) * 2013-10-29 2016-06-22 保力马科技(日本)株式会社 Liquid-filled heat dissipation member
US20160278237A1 (en) * 2013-10-29 2016-09-22 Polymatech Japan Co., Ltd. Liquid-Encapsulation Heat Dissipation Member
US10356944B2 (en) * 2013-10-29 2019-07-16 Sekisui Polymatech Co., Ltd. Liquid-encapsulation heat dissipation member
US9609738B1 (en) * 2013-12-23 2017-03-28 Flextronics Ap, Llc Graphite sheet to redirect SMT components during thermal exposure
CN109755104A (en) * 2017-11-01 2019-05-14 天津环鑫科技发展有限公司 A kind of raising chip freezes production capacity technique in advance

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Legal Events

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AS Assignment

Owner name: LOTES CO., LTD., TAIWAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:WU, HUNG-YI;REEL/FRAME:017700/0906

Effective date: 20060222

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION