DE3625543A1 - Band- bzw. drahtfoermiges material - Google Patents

Band- bzw. drahtfoermiges material

Info

Publication number
DE3625543A1
DE3625543A1 DE19863625543 DE3625543A DE3625543A1 DE 3625543 A1 DE3625543 A1 DE 3625543A1 DE 19863625543 DE19863625543 DE 19863625543 DE 3625543 A DE3625543 A DE 3625543A DE 3625543 A1 DE3625543 A1 DE 3625543A1
Authority
DE
Germany
Prior art keywords
metal
band
phosphorus
outer coating
tin
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
Application number
DE19863625543
Other languages
English (en)
Other versions
DE3625543C2 (de
Inventor
Heinz Georg Hiesboeck
Karl Bartl
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.)
KARL NEUMAYER ERZEUGUNG und VERTRIEB VON KABELN DRAEHTEN ISOLIERTEN LEITUNGEN und ELEKTROMATERIAL GmbH
Original Assignee
KARL NEUMAYER ERZEUGUNG und VERTRIEB VON KABELN DRAEHTEN ISOLIERTEN LEITUNGEN und ELEKTROMATERIAL GmbH
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 KARL NEUMAYER ERZEUGUNG und VERTRIEB VON KABELN DRAEHTEN ISOLIERTEN LEITUNGEN und ELEKTROMATERIAL GmbH filed Critical KARL NEUMAYER ERZEUGUNG und VERTRIEB VON KABELN DRAEHTEN ISOLIERTEN LEITUNGEN und ELEKTROMATERIAL GmbH
Publication of DE3625543A1 publication Critical patent/DE3625543A1/de
Application granted granted Critical
Publication of DE3625543C2 publication Critical patent/DE3625543C2/de
Granted legal-status Critical Current

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Classifications

    • H—ELECTRICITY
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    • H01L24/42—Wire connectors; Manufacturing methods related thereto
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/01—Layered products comprising a layer of metal all layers being exclusively metallic
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Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Hardware Design (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Non-Insulated Conductors (AREA)
  • Chemically Coating (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Electroplating Methods And Accessories (AREA)
  • Laminated Bodies (AREA)
  • Conductive Materials (AREA)

Description

Die Erfindung betrifft ein band- bzw. drahtförmiges Material aus einem Phosphor enthaltenden Metall bzw. Metall-Legierung, wie z. B. Phosphorbronze, desoxidiertes Kupfer od. dgl., und einer aus einer Blei-Legierung, insbesondere Zinn-Blei-Legierung bestehenden Außenbeschichtung.
Materialien dieser Art kommen bevorzugt in der Elektro- und Elektronikindustrie zum Einsatz, wo es insbesondere auf deren Lötfähigkeit und Korrosionsbeständigkeit ankommt. Es hat sich nun gezeigt, daß Materialien dieser Art in dem Sinne altern, daß sie im Laufe der Zeit ihre Benetzungsfähigkeit gegenüber flüssigen Zinn-Blei-Legierungen bzw. gegenüber Zinn verlieren, also ihre Lötfähigkeit. Von besonderem Nachteil bei diesen bekannten Materialien ist, daß dieser Alterungsprozeß, also das Verlieren der Lötfähigkeit, relativ rasch eintritt, Zeiträume von fünf Wochen bis zwölf Wochen sind üblich.
Aufgabe der Erfindung ist es, diese Nachteile zu beseitigen und ein band- bzw. drahtförmiges Material zu schaffen, bei welchem der Alterungsprozeß hinsichtlich des Verlierens der Lötfähigkeit wesentlich langsamer abläuft, d. h. jedenfalls so langsam, daß es in den üblichen Zeiträumen von bis zu einem Jahr zwischen Produktion und Verarbeitung seine Lötfähigkeit beibehält.
Erfindungsgemäß wird diese Aufgabe bei einem band- oder drahtförmigen Material der eingangs genannten Art dadurch gelöst, daß der Phosphorgehalt des Metall bzw. der Metall- Legierung zwischen 0,13 und 0,03 Gew.%, vorzugsweise zwischen 0,05 und 0,06 Gew.%, liegt.
Bei den bisher bekannten band- bzw. drahtförmigen Materialien insbesondere für Lötzwecke, waren wesentlich höhere Phosphoranteile vorliegend, und es ist das Verdienst der Erfindung erkannt zu haben, daß die Materialien zufolge dieses hohen Phosphorgehaltes so rasch ihre Lötfähigkeit verlieren. Bisher war man vielmehr nach Theorie und Praxis der Auffassung, daß die Ursachen dieses Verlierens der Lötfähigkeit zurückgeht auf die Diffusion des Kupfers aus dem Grundmaterial in die aus einer Zinn-Blei-Legierung bestehenden Außenbeschichtung sowie umgekehrt auf die Diffusion des Zinns aus der Außenbeschichtung in das Grundmaterial aus Metall bzw. einer Metall-Legierung. Es ist also das Verdienst der Erfindung erkannt zu haben, daß es die Diffusion des Phosphors aus dem Grundmaterial in die bleihältige metallische Außenbeschichtung ist, welche die rasche Verschlechterung der Lötfähigkeit verursacht.
Gemäß einer bevorzugten Ausführungsform der Erfindung kann diese Diffusion des Phosphors in die Außenbeschichtung noch weiter dadurch herabgesetzt werden, daß zwischen dem Metall bzw. der Metall-Legierung und der Außenbeschichtung eine metallische Sperrschicht angeordnet ist. Diese kann aus Nickel oder vorzugsweise aus Kupfer bestehen und eine Dicke von zumindestens 0,002 mm aufweisen.
Bei einem bekannten Material, das aus einer Phosphor-Bronze mit 5 Gew.% Zinn, 94,7 Gew.% Kupfer und 0,3 Gew.% Phosphor besteht und eine Außenbeschichtung aus einer Zinn-Blei-Legierung, wie z. B. 5% Blei und 95% Zinn, aufweist beträgt die Lagerzeit, während welcher die Lötfähigkeit nicht verloren geht etwa zwei bis fünf Monate. Diese Werte der Lagerzeit sind jedoch auch stark unterschiedlich, weil der Phosphor in der Phosphor-Bronze stark diskontinuierlich verteilt ist, sodaß ohne weiteres Chargen vorliegen können, bei welchen diese Lagerzeit wesentlich kürzer ist als bei anderen Chargen.
Setzt man gemäß der Erfindung den Anteil von Phosphor auf höchstens 0,13 Gew.% fest, bei sonst gleichbleibenden Zusammensetzungen und Gew.Anteilen (entsprechend der Erhöhung des Kupferanteiles bzw. Zinnanteiles zufolge niedrigeren Phosphorgehaltes) so ergeben sich Lagerzeiten von zumindestens zwei Jahren während welcher die Lötfähigkeit nicht verloren geht. Darüberhinaus konnte aber auch festgestellt werden, daß die bei den bekannten Materialien mit hohem Phosphoranteil auftretenden Schwankungen der Lötfähigkeit als Funktion der Lagerzeit vermieden werden konnten.
Als besonders vorteilhaft haben sich Phosphorgehalte im Bereich zwischen 0,05 und 0,06 Gew.% herausgestellt.
Um eine Diffusion des in dem Metall bzw. der Metall- Legierung enthaltenden Phosphors in die bleihaltige Außenbeschichtung weiter herabzusetzen, kann eine Sperrschicht zwischen der Außenbeschichtung und dem Metall bzw. der Metall-Legierung vorgesehen werden. Bei einer aus Kupfer bestehenden Sperrschicht einer Dicke von 0,002 mm konnte bei der oben beschriebenen erfindungsgemäßen Zusammensetzung des Materials eine weitere Erhöhung der Lagerzeit erreicht werden.
Ferner wurde beobachtet, daß bei erfindungsgemäßen Materialien die Langzeithaftfestigkeit der aus einer Zinn-Blei-Legierung bestehenden Beschichtung an dem phosphorhaltigen Metall bzw. Metall-Legierung wesentlich erhöht ist. Tordiert man zum Beispiel die bekannten Materialien mit hohem Phosphorgehalt nach einer Lagerzeit von fünf Monaten bis ein Jahr, so stellt man fest, daß sich die Außenbeschichtung bereichsweise ablöst, was bei den erfindungsgemäßen Materialien nicht der Fall ist.

Claims (4)

1. Band- bzw. drahtförmiges Material aus einer Phosphor enthaltenden Metall- bzw. Metall-Legierung, wei z. B. Phosphor-Bronze, desoxidiertes Kupfer od. dgl., mit einer aus einer Blei-Legierung insbesondere einer Zinn-Blei-Legierung, bestehenden Außenbeschichtung, dadurch gekennzeichnet, daß der Phosphorgehalt des Metall bzw. der Metall-Legierung zwischen 0,13 und 0,03 Gew.%, vorzugsweise zwischen 0,05 und 0,06 Gew.%, liegt.
2. Material nach Anspruch 1, dadurch gekennzeichnet, daß zwischen dem Metall bzw. der Metall-Legierung und der Außenbeschichtung eine metallische Sperrschicht angeordnet ist.
3. Material nach Anspruch 2, dadurch gekennzeichnet, daß die metallische Sperrschicht aus Nickel oder Kupfer besteht.
4. Material nach Anspruch 2 oder 3, dadurch gekennzeichnet, daß die Sperrschicht eine Dicke von mindestens 0,002 mm aufweist.
DE19863625543 1985-12-13 1986-07-29 Band- bzw. drahtfoermiges material Granted DE3625543A1 (de)

Applications Claiming Priority (1)

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AT0361085A AT385932B (de) 1985-12-13 1985-12-13 Band- bzw. drahtfoermiges material

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DE3625543A1 true DE3625543A1 (de) 1987-06-19
DE3625543C2 DE3625543C2 (de) 1988-03-03

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AT (1) AT385932B (de)
DE (1) DE3625543A1 (de)
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GB2185704B (en) 1989-05-10
DE3625543C2 (de) 1988-03-03
FR2591518B1 (fr) 1994-01-28
GB8618404D0 (en) 1986-09-03
FR2591518A1 (fr) 1987-06-19
US5045410A (en) 1991-09-03
GB2185704A (en) 1987-07-29
ATA361085A (de) 1987-11-15
AT385932B (de) 1988-06-10

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