JP5714575B2 - 表面処理銅箔 - Google Patents
表面処理銅箔 Download PDFInfo
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- JP5714575B2 JP5714575B2 JP2012515832A JP2012515832A JP5714575B2 JP 5714575 B2 JP5714575 B2 JP 5714575B2 JP 2012515832 A JP2012515832 A JP 2012515832A JP 2012515832 A JP2012515832 A JP 2012515832A JP 5714575 B2 JP5714575 B2 JP 5714575B2
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- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
- C23C28/30—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer
- C23C28/34—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates
- C23C28/345—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer
- C23C28/3455—Coatings combining at least one metallic layer and at least one inorganic non-metallic layer including at least one inorganic non-metallic material layer, e.g. metal carbide, nitride, boride, silicide layer and their mixtures, enamels, phosphates and sulphates with at least one oxide layer with a refractory ceramic layer, e.g. refractory metal oxide, ZrO2, rare earth oxides or a thermal barrier system comprising at least one refractory oxide layer
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- C25D1/00—Electroforming
- C25D1/04—Wires; Strips; Foils
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- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/10—Electroplating with more than one layer of the same or of different metals
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- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
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- C25D7/00—Electroplating characterised by the article coated
- C25D7/06—Wires; Strips; Foils
- C25D7/0614—Strips or foils
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/02—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of metals or alloys
- H01B1/026—Alloys based on copper
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- C25D3/02—Electroplating: Baths therefor from solutions
- C25D3/56—Electroplating: Baths therefor from solutions of alloys
- C25D3/565—Electroplating: Baths therefor from solutions of alloys containing more than 50% by weight of zinc
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- C25D5/00—Electroplating characterised by the process; Pretreatment or after-treatment of workpieces
- C25D5/48—After-treatment of electroplated surfaces
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
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- H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
- H05K2201/03—Conductive materials
- H05K2201/0332—Structure of the conductor
- H05K2201/0335—Layered conductors or foils
- H05K2201/0355—Metal foils
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- Y10T428/00—Stock material or miscellaneous articles
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- Y10T428/12431—Foil or filament smaller than 6 mils
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- Y10T428/12—All metal or with adjacent metals
- Y10T428/12493—Composite; i.e., plural, adjacent, spatially distinct metal components [e.g., layers, joint, etc.]
- Y10T428/12771—Transition metal-base component
- Y10T428/12785—Group IIB metal-base component
- Y10T428/12792—Zn-base component
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Description
本件発明に係る表面処理銅箔は、銅箔の両面に防錆処理層を備える表面処理銅箔であって、当該防錆処理層は、亜鉛合金で構成し、且つ、いずれの面の亜鉛量も20mg/m2〜1000mg/m2の亜鉛合金層であり、当該銅箔は、炭素、硫黄、塩素、窒素から選ばれる1種又は2種以上の微量成分を含有し、これらの総含有量が100ppm以上であることを特徴とするものである。
本件発明に係る表面処理銅箔は、図1に模式的に示すように、銅箔の両面に防錆処理層を備える表面処理銅箔である。この図1には、銅箔2の片面側には、「防錆処理層3/クロメート処理層4/有機剤処理層5」の3層構成の表面処理層があり、反対面には「粗化処理層6/防錆処理層3/クロメート処理層4/有機剤処理層5」の4層構成の表面処理層がある状態を典型例として示している。なお、このときの粗化処理層は、微細銅粒子の集合体として示している。そして、図1における、粗化処理層6、クロメート処理層4及び有機剤処理層5は、要求特性に応じて設ける任意の表面処理層である。よって、層構成として多くのバリエーションが、本件発明に含まれることになる。なお、図面において、模式的に示した各層及び粗化状態は、説明を容易にするためのものであり、現実の製品の厚さ及び粗化状態を反映したものでないことを明記しておく。以下、本件発明に係る表面処理銅箔の構成が理解できるように、各項目毎に説明する。
本件発明に係る表面処理銅箔の製造方法は、上述に記載の表面処理銅箔の製造方法であって、銅箔の表面に対して、防錆処理層として「亜鉛合金層」を設ける防錆処理工程の他、必要に応じて、粗化処理及びその他の各種表面処理を施し、所定の条件で加熱する乾燥工程を備える。以下、工程毎に説明する。
銅箔: ここでは、箔中の微量元素の合計量が100ppm以上の電解銅箔として、三井金属鉱業株式会社製のVLP銅箔の製造に用いる厚さ12μmの表面処理の施されていない電解銅箔を用いた。この銅箔は、箔中に炭素を44ppm、硫黄を14ppm、塩素を52ppm、窒素を11ppm含有し、これら微量元素の総含有量が121ppmであった。また、結晶粒径が0.60μmであり、常態引張強さの値が54.4kgf/mm2であった。
以下、評価項目及びその測定方法に関して述べる。この実施例に係る実施試料1〜実施試料9の評価結果は、以下に述べる比較例に係る比較試料と対比可能なように表1に示す。
この比較例1は、実施例で用いた銅箔に防錆処理を施すことなく、実施例と同様の手順で表面処理銅箔を製造し、これを比較試料1とした。
この比較例1は、実施例の防錆処理層に用いた亜鉛−スズ合金層を用いているが、その亜鉛−スズ合金層中の亜鉛量が20mg/m2未満(亜鉛付着量:12mg/m2、スズ付着量:2mg/m2)となるようにして比較試料2を得た。その他の工程及び評価に関しては、実施例と同様であるため記載を省略する。
この比較例3は、防錆処理層を構成する亜鉛合金中の亜鉛防錆量が20mg/m2未満で、且つ、亜鉛含有量が40質量%未満の「亜鉛−ニッケル合金(亜鉛付着量:12mg/m2、ニッケル付着量:20mg/m2)」に置き換えたものである。その他の工程及び評価に関しては、実施例と同様であるため記載を省略し、防錆処理工程に関してのみ述べる。
この比較例4では、「箔中の微量元素の合計量が100ppm以下」で、且つ、「結晶粒径が1.0μmより大きい」という条件を満たす電解銅箔を選択して用いた。
ここでの実施例と比較例との対比は、以下の表1を参照して行う。
以上の対比結果から、表面処理銅箔は、「炭素、硫黄、塩素、窒素から選ばれる1種又は2種以上の微量成分を含有し、これらの総含有量が100ppm以上の銅箔」を用いることを前提として、この銅箔の両面にある防錆処理層は、亜鉛合金層として「亜鉛含有量が40質量%以上の亜鉛−銅合金層」又は「亜鉛−スズ合金層」を採用し、且つ、「その亜鉛合金層が含有する亜鉛量が20mg/m2〜1000mg/m2」の条件を満たすことが、高温負荷を受けたときの耐軟化性能を向上させるためには必須である。これらの条件を満たすことで、防錆処理層として亜鉛合金層を備える表面処理銅箔が「350℃×60分間の加熱処理を行った後の引張強さが40kgf/mm2以上」、「400℃×60分間の加熱処理を行った後の引張強さが35kgf/mm2以上」という良好な耐軟化性能を備えることが理解できる。
2 銅箔層
3 防錆処理層(亜鉛合金層)
4 クロメート処理層
5 有機剤処理層
6 粗化処理層(微細銅粒)
Claims (12)
- 銅箔の両面に防錆処理層を備える表面処理銅箔であって、
当該防錆処理層は、亜鉛合金で構成し、且つ、いずれの面の亜鉛量も20mg/m2〜1000mg/m2の亜鉛合金層であり、
当該銅箔は、炭素、硫黄、塩素、窒素から選ばれる1種又は2種以上の微量成分を含有し、これらの総含有量が100ppm以上であることを特徴とする表面処理銅箔。 - 前記銅箔の両面に配した亜鉛合金層を構成する総亜鉛量が40mg/m2〜2000mg/m2である請求項1に記載の表面処理銅箔。
- 前記防錆処理層としての亜鉛合金層は、亜鉛含有量が40質量%以上の亜鉛−銅合金又は亜鉛−スズ合金で構成したものである請求項1又は請求項2に記載の表面処理銅箔。
- 前記亜鉛合金層の構成に亜鉛−スズ合金を用いる場合において、前記亜鉛合金層に含まれるスズ含有量は、1mg/m2〜200mg/m2である請求項3に記載の表面処理銅箔。
- 前記銅箔は、常態の結晶粒径が1.0μm以下である電解銅箔である請求項1〜請求項4のいずれかに記載の表面処理銅箔。
- 前記銅箔は、常態の引張強さが50kgf/mm2以上の電解銅箔である請求項1〜請求項5のいずれかに記載の表面処理銅箔。
- 前記銅箔は、片面側又は両面側を粗化処理したものである請求項1〜請求項6のいずれかに記載の表面処理銅箔。
- 前記防錆処理層の表面に、クロメート処理層、有機剤処理層のいずれか一方又は双方を備える請求項1〜請求項7のいずれかに記載の表面処理銅箔。
- 前記有機剤処理層は、シランカップリング剤処理層、有機防錆処理層のいずれか一方又は双方からなるものである請求項8に記載の表面処理銅箔。
- 当該表面処理銅箔の表面粗さ(Ra)が、0.1μm〜0.7μmである請求項1〜請求項9のいずれかに記載の表面処理銅箔。
- 不活性ガス雰囲気において、350℃×60分間の加熱処理を行った後の引張強さが40kgf/mm2以上である請求項1〜請求項10のいずれかに記載の表面処理銅箔。
- 不活性ガス雰囲気において、400℃×60分間の加熱処理を行った後の引張強さが35kgf/mm2以上である請求項1〜請求項11のいずれかに記載の表面処理銅箔。
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