JP2017013080A - はんだ材料、はんだ継手およびはんだ材料の検査方法 - Google Patents
はんだ材料、はんだ継手およびはんだ材料の検査方法 Download PDFInfo
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- JP2017013080A JP2017013080A JP2015129649A JP2015129649A JP2017013080A JP 2017013080 A JP2017013080 A JP 2017013080A JP 2015129649 A JP2015129649 A JP 2015129649A JP 2015129649 A JP2015129649 A JP 2015129649A JP 2017013080 A JP2017013080 A JP 2017013080A
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- Prior art keywords
- solder
- core
- ball
- solder material
- core ball
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- 238000010438 heat treatment Methods 0.000 claims description 16
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- 239000011247 coating layer Substances 0.000 claims description 13
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- 229910052742 iron Inorganic materials 0.000 claims description 13
- 229910052782 aluminium Inorganic materials 0.000 claims description 11
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- 229910052725 zinc Inorganic materials 0.000 claims description 11
- 229910052797 bismuth Inorganic materials 0.000 claims description 10
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- 229910052732 germanium Inorganic materials 0.000 claims description 10
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- GEZAUFNYMZVOFV-UHFFFAOYSA-J 2-[(2-oxo-1,3,2$l^{5},4$l^{2}-dioxaphosphastannetan-2-yl)oxy]-1,3,2$l^{5},4$l^{2}-dioxaphosphastannetane 2-oxide Chemical compound [Sn+2].[Sn+2].[O-]P([O-])(=O)OP([O-])([O-])=O GEZAUFNYMZVOFV-UHFFFAOYSA-J 0.000 description 1
- JKFYKCYQEWQPTM-UHFFFAOYSA-N 2-azaniumyl-2-(4-fluorophenyl)acetate Chemical compound OC(=O)C(N)C1=CC=C(F)C=C1 JKFYKCYQEWQPTM-UHFFFAOYSA-N 0.000 description 1
- CQMNNMLVXSWLCH-UHFFFAOYSA-B 2-hydroxypropane-1,2,3-tricarboxylate;tin(4+) Chemical compound [Sn+4].[Sn+4].[Sn+4].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O.[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O CQMNNMLVXSWLCH-UHFFFAOYSA-B 0.000 description 1
- SKEZDZQGPKHHSH-UHFFFAOYSA-J 2-hydroxypropanoate;tin(4+) Chemical compound [Sn+4].CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O.CC(O)C([O-])=O SKEZDZQGPKHHSH-UHFFFAOYSA-J 0.000 description 1
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- OCUCCJIRFHNWBP-IYEMJOQQSA-L Copper gluconate Chemical compound [Cu+2].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O OCUCCJIRFHNWBP-IYEMJOQQSA-L 0.000 description 1
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- 229910021612 Silver iodide Inorganic materials 0.000 description 1
- RZESOXIJGKVAAX-UHFFFAOYSA-L [Ag++].[O-]C(=O)CCC([O-])=O Chemical compound [Ag++].[O-]C(=O)CCC([O-])=O RZESOXIJGKVAAX-UHFFFAOYSA-L 0.000 description 1
- RAOSIAYCXKBGFE-UHFFFAOYSA-K [Cu+3].[O-]P([O-])([O-])=O Chemical compound [Cu+3].[O-]P([O-])([O-])=O RAOSIAYCXKBGFE-UHFFFAOYSA-K 0.000 description 1
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- ODWXUNBKCRECNW-UHFFFAOYSA-M bromocopper(1+) Chemical compound Br[Cu+] ODWXUNBKCRECNW-UHFFFAOYSA-M 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- MGIWDIMSTXWOCO-UHFFFAOYSA-N butanedioic acid;copper Chemical compound [Cu].OC(=O)CCC(O)=O MGIWDIMSTXWOCO-UHFFFAOYSA-N 0.000 description 1
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- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 1
- XTVVROIMIGLXTD-UHFFFAOYSA-N copper(II) nitrate Chemical compound [Cu+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O XTVVROIMIGLXTD-UHFFFAOYSA-N 0.000 description 1
- ARUVKPQLZAKDPS-UHFFFAOYSA-L copper(II) sulfate Chemical compound [Cu+2].[O-][S+2]([O-])([O-])[O-] ARUVKPQLZAKDPS-UHFFFAOYSA-L 0.000 description 1
- OPQARKPSCNTWTJ-UHFFFAOYSA-L copper(ii) acetate Chemical compound [Cu+2].CC([O-])=O.CC([O-])=O OPQARKPSCNTWTJ-UHFFFAOYSA-L 0.000 description 1
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- ZHOLKSYCHRKNCU-UHFFFAOYSA-H copper;silicon(4+);hexafluoride Chemical compound [F-].[F-].[F-].[F-].[F-].[F-].[Si+4].[Cu+2] ZHOLKSYCHRKNCU-UHFFFAOYSA-H 0.000 description 1
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- PEVJCYPAFCUXEZ-UHFFFAOYSA-J dicopper;phosphonato phosphate Chemical compound [Cu+2].[Cu+2].[O-]P([O-])(=O)OP([O-])([O-])=O PEVJCYPAFCUXEZ-UHFFFAOYSA-J 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
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- ADZWSOLPGZMUMY-UHFFFAOYSA-M silver bromide Chemical compound [Ag]Br ADZWSOLPGZMUMY-UHFFFAOYSA-M 0.000 description 1
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- HKZLPVFGJNLROG-UHFFFAOYSA-M silver monochloride Chemical compound [Cl-].[Ag+] HKZLPVFGJNLROG-UHFFFAOYSA-M 0.000 description 1
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- FJOLTQXXWSRAIX-UHFFFAOYSA-K silver phosphate Chemical compound [Ag+].[Ag+].[Ag+].[O-]P([O-])([O-])=O FJOLTQXXWSRAIX-UHFFFAOYSA-K 0.000 description 1
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- YPNVIBVEFVRZPJ-UHFFFAOYSA-L silver sulfate Chemical compound [Ag+].[Ag+].[O-]S([O-])(=O)=O YPNVIBVEFVRZPJ-UHFFFAOYSA-L 0.000 description 1
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- LMEWRZSPCQHBOB-UHFFFAOYSA-M silver;2-hydroxypropanoate Chemical compound [Ag+].CC(O)C([O-])=O LMEWRZSPCQHBOB-UHFFFAOYSA-M 0.000 description 1
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- VPKAOUKDMHJLAY-UHFFFAOYSA-J tetrasilver;phosphonato phosphate Chemical compound [Ag+].[Ag+].[Ag+].[Ag+].[O-]P([O-])(=O)OP([O-])([O-])=O VPKAOUKDMHJLAY-UHFFFAOYSA-J 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- XOLBLPGZBRYERU-UHFFFAOYSA-N tin dioxide Chemical compound O=[Sn]=O XOLBLPGZBRYERU-UHFFFAOYSA-N 0.000 description 1
- 229910001887 tin oxide Inorganic materials 0.000 description 1
- YZJQPSAZKVXWEZ-UHFFFAOYSA-J tin(4+) tetraformate Chemical compound [Sn+4].[O-]C=O.[O-]C=O.[O-]C=O.[O-]C=O YZJQPSAZKVXWEZ-UHFFFAOYSA-J 0.000 description 1
- FAKFSJNVVCGEEI-UHFFFAOYSA-J tin(4+);disulfate Chemical compound [Sn+4].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O FAKFSJNVVCGEEI-UHFFFAOYSA-J 0.000 description 1
- QUBMWJKTLKIJNN-UHFFFAOYSA-B tin(4+);tetraphosphate Chemical compound [Sn+4].[Sn+4].[Sn+4].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QUBMWJKTLKIJNN-UHFFFAOYSA-B 0.000 description 1
- AECLSPNOPRYXFI-UHFFFAOYSA-J tin(4+);tetrasulfamate Chemical compound [Sn+4].NS([O-])(=O)=O.NS([O-])(=O)=O.NS([O-])(=O)=O.NS([O-])(=O)=O AECLSPNOPRYXFI-UHFFFAOYSA-J 0.000 description 1
- HPGGPRDJHPYFRM-UHFFFAOYSA-J tin(iv) chloride Chemical compound Cl[Sn](Cl)(Cl)Cl HPGGPRDJHPYFRM-UHFFFAOYSA-J 0.000 description 1
- QPBYLOWPSRZOFX-UHFFFAOYSA-J tin(iv) iodide Chemical compound I[Sn](I)(I)I QPBYLOWPSRZOFX-UHFFFAOYSA-J 0.000 description 1
- YJGJRYWNNHUESM-UHFFFAOYSA-J triacetyloxystannyl acetate Chemical compound [Sn+4].CC([O-])=O.CC([O-])=O.CC([O-])=O.CC([O-])=O YJGJRYWNNHUESM-UHFFFAOYSA-J 0.000 description 1
- YQMWDQQWGKVOSQ-UHFFFAOYSA-N trinitrooxystannyl nitrate Chemical compound [Sn+4].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O YQMWDQQWGKVOSQ-UHFFFAOYSA-N 0.000 description 1
- PQGFRBOHUKOXQZ-FSCNPAMSSA-J tris[[(2R,3S,4R,5R)-2,3,4,5,6-pentahydroxyhexanoyl]oxy]stannyl (2R,3S,4R,5R)-2,3,4,5,6-pentahydroxyhexanoate Chemical compound [Sn+4].OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O.OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C([O-])=O PQGFRBOHUKOXQZ-FSCNPAMSSA-J 0.000 description 1
- QUTYHQJYVDNJJA-UHFFFAOYSA-K trisilver;2-hydroxypropane-1,2,3-tricarboxylate Chemical compound [Ag+].[Ag+].[Ag+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O QUTYHQJYVDNJJA-UHFFFAOYSA-K 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
- 238000010407 vacuum cleaning Methods 0.000 description 1
- 238000009736 wetting Methods 0.000 description 1
Images
Classifications
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- B23K35/26—Selection of soldering or welding materials proper with the principal constituent melting at less than 400 degrees C
- B23K35/262—Sn as the principal constituent
-
- 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
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-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K35/025—Pastes, creams, slurries
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- B23K35/302—Cu as the principal constituent
-
- 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
- B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
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- B23K35/3033—Ni as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B23K35/3046—Co as the principal constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
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- B23K35/3602—Carbonates, basic oxides or hydroxides
-
- B—PERFORMING OPERATIONS; TRANSPORTING
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- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
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Abstract
Description
図1は、本発明に係るCu核ボール1の構成の一例を示す断面図である。図1に示すように、本発明に係るCu核ボール1は、所定の大きさを有して半導体パッケージ(接合物)とプリント基板(被接合物)との間で間隔を確保するCuボール(核)2と、Cuボール2を被覆するはんだ層(被覆層)3とを備えている。
本発明に係るCu核ボール1は、焼き試験前のL*a*b*表色系における明度が65以上、かつ、L*a*b*表色系における黄色度が7.0以下である。明度および黄色度が上記範囲内のCu核ボール1を選定することにより、はんだ層3の表面に形成される酸化膜厚を一定値以下で管理することができる。
本発明に係るCu核ボール1は、焼き試験後のL*a*b*表色系における明度が62.5以上である。150℃の大気湿度下で72時間、Cu核ボール1を加熱する理由は、Cu核ボール1の洗浄後に残るめっき液残渣量に応じて形成される酸化膜を、長期間、例えば1か月間にわたる保管試験を行わなくても短時間で形成することができるからである。また、Cu核ボール1の明度が62.5以上とする理由は、焼き試験により酸化膜が所定の膜厚(4.9nm)を超えたCu核ボール1を正確に見分けて管理するためである。なお、Cu核ボール1のL*a*b*表色系における明度は、より好ましくは70.2以上である。この場合には、より酸化膜厚を厳しく管理できる。上述した2つの条件を満たすことで、Cu核ボール1の洗浄後におけるめっき液残渣量が少なく、長期保管後に酸化し難いCu核ボール1を簡易かつ容易に見分けることができる。
次に、本発明に係るCu核ボール1を構成するCuボール2について詳しく説明する。なお、Cuボール2の構成等は、焼き試験前後において共通しているため、以下にまとめて説明する。Cuボール2は、Cu核ボール1がはんだバンプに用いられる際、はんだ付けの温度で溶融しないため、はんだ継手の高さばらつきを抑制する機能を有する。したがって、Cuボール2は、真球度が高く直径のバラツキが少ない方が好ましい。
Cuボール2は、Cu単体の組成により構成することもできるし、Cuを主成分とする合金組成により構成することもできる。Cuボール2を合金により構成する場合、Cuの含有量は50質量%以上である。また、核となるボールとしては、Cu以外にも、Ni、Ag、Bi、Pb、Al、Sn、Fe、Zn、In、Ge、Sb、Co、Mn、Au、Si、Pt、Cr、La、Mo、Nb、Pd、Ti、Zr、Mgの金属単体や合金、金属酸化物、あるいは金属混合酸化物により構成しても良い。
Cuボール2の純度は特に限定されないが、純度の低下によるCuボール2の電気伝導度や熱伝導率の劣化を抑制し、また必要に応じてα線量を抑制する観点から、99.9%以上である。Cuボール2に含まれる不純物元素としては、Sn、Sb、Bi、Ni、Zn、Fe、Al、As、Ag、In、Cd、Pb、Au、P、S、Coなどが挙げられる。
Cuボール2の真球度は、スタンドオフ高さを制御する観点から0.95以上である。Cuボール2の真球度が0.95未満であると、Cuボール2が不定形状になるため、バンプ形成時に高さが不均一なバンプが形成され、接合不良が発生する可能性が高まる。さらに、Cu核ボール1を電極に搭載してリフローを行う際、Cu核ボール1が位置ずれを起こしてしまい、セルフアライメント性も悪化する。真球度は、より好ましくは0.990以上である。本発明において、真球度とは真球からのずれを表す。真球度は、例えば、最小二乗中心法(LSC法)、最小領域中心法(MZC法)、最大内接中心法(MIC法)、最小外接中心法(MCC法)など種々の方法で求められる。詳しくは、真球度とは、例えば500個の各Cuボール2の直径を長径で割った際に算出される算術平均値であり、値が上限である1.00に近いほど真球に近いことを表す。本発明での長径の長さ、および直径の長さとは、ミツトヨ社製のウルトラクイックビジョン、ULTRA QV350−PRO測定装置によって測定された長さをいう。
Cuボール2の直径は、1〜1000μmである。Cuボール2の直径がこの範囲にあると、球状のCuボール2を安定して製造でき、また、端子間が狭ピッチである場合の接続短絡を抑制することができる。
次に、本発明に係るCu核ボール1を構成するはんだ層3について詳しく説明する。なお、はんだ層3の構成等は、焼き試験前後において共通しているため、以下にまとめて説明する。はんだ層3は、Cu核ボール1がはんだバンプに用いられる際、リフロー時の温度により溶融し、半導体パッケージの電極とプリント基板の電極とを電気的に接合する接合部材として機能する。
はんだ層3は、Sn単体の組成とすることもできるし、Snを主成分とする鉛フリーはんだ合金の合金組成とすることもできるし、Sn−Pbはんだ合金の組成とすることもできる。はんだ層3を合金により構成する場合、Snの含有量は40質量%以上である。鉛フリーはんだ組成の一例としては、例えば、Sn、Sn−Ag合金、Sn−Cu合金、Sn−Bi合金、Sn−Ag−Cu合金、Sn−In合金、およびこれらに所定の合金元素を添加したものが挙げられる。添加する合金元素としては、例えばAg、Cu、In、Ni、Co、Sb、P、Fe等が挙げられる。添加する合金元素の添加量については、鉛フリーはんだ合金の黄色度と明度がSn単体の黄色度と明度とほぼ同程度となる量に抑えるのが好ましい。これらの中でも、はんだ層3の合金組成は、熱疲労寿命の観点から、Sn−3Ag−0.5Cu合金が好ましい。はんだ層3の厚さは、特に制限されないが、例えば100μm(片側)以下であれば十分である。一般には20〜50μmであれば良い。なお、本発明におけるSnを主成分とする鉛フリーはんだ合金のSnの含有量は、好ましくはSnが80%以上、より好ましくはSnが90%以上である。
次に、本発明に係るCu核ボール1の製造方法の一例を説明する。まず、セラミックのような耐熱性の板であって、底部に半球状をなす多数の円形の溝が設けられた耐熱板を用意する。溝の直径や深さは、Cuボール2の粒径に応じて適宜設定されており、例えば、直径が0.8mmであり、深さが0.88mmである。次に、材料となるCu細線を切断することで得られたチップ形状のCu材(以下、「チップ材」という。)を、耐熱板の溝内に一個ずつ投入する。
式(1)中、wは電解析出量(g)、Iは電流(A)、tは通電時間(秒)、Mは析出する元素の原子量(Snの場合、118.71)、Zは原子価(Snの場合は2価)、Fはファラデー定数(96500クーロン)であり、電気量Q(A・秒)は(I×t)で表される。
また、本発明に係るCu核ボール1を構成する核は、樹脂ボールにより構成することもできる。樹脂材料としては、例えばアミノ樹脂、アクリル樹脂、エチレン−酢酸ビニル樹脂、スチレン−ブタジエンブロック共重合体、ポリエステル樹脂、メラミン樹脂、フェノール樹脂、アルキド樹脂、ポリイミド樹脂、ウレタン樹脂、エポキシ樹脂、架橋樹脂等からなるものが挙げられる。中でもポリアセチレン、ポリピロール、ポリチオフェン、ポリアニリンなどの導電性プラスチック等を使用するのが好ましい。核を樹脂材料とした場合、樹脂ボールと、樹脂ボールの表面を被覆するSn−Ag−Cu系はんだめっき層(被覆層)によりCu核ボールを構成することができる。なお、上述した被覆層の種類や積層構造は、上記例に限定されるものではない。
上述した実施の形態では、明度と黄色度によりCu核ボール1の酸化レベルを管理した例について説明したが、これに限定されることはない。例えば、Cu核ボールの表面に形成される酸化膜の膜厚を直接管理することにより、洗浄後におけるCu核ボールの酸化レベルを管理しても良い。本発明に係る他のCu核ボールは、半導体パッケージとプリント基板との間で間隔を確保するCuボールと、Cuボールを被覆するはんだ層とを備え、150度の大気湿度下で72時間の焼き試験後の酸化膜厚が4.9nm以下である。焼き試験後におけるCu核ボールの酸化膜厚を4.9nm以下で管理することで、洗浄が十分に実施されており、酸化し難い(酸化膜の薄い)Cu核ボールを見分けて取得することができる。Cu核ボールの酸化膜厚は、より好ましくは3.1nm以下である。なお、上述したCu核ボール1と実質的に同一の構成機能については、便宜上説明を省略する。
上述した実施の形態では、はんだ材料の形状がボール型の場合について説明したが、はんだ材料の形状がカラム型の場合にも、本発明を適用することができる。はんだ材料をカラム形状とする場合、はんだ材料は、円柱状をなすカラムと、カラムの表面を被覆するはんだ層とから構成される。このはんだ材料は、150℃の大気湿度下で72時間の焼き試験後のL*a*b*表色系における明度が62.5以上であり、焼き試験前のはんだ材料のL*a*b*表色系における明度が65以上、かつ、L*a*b*表色系における黄色度が7.0以下である。
純度が99.995%以下のCuワイヤを準備した。準備した各々をるつぼの中に投入した後、るつぼの温度を1200℃に昇温し、45分間加熱処理を行った。続けて、るつぼ底部に設けたオリフィスから溶融Cuの液滴を滴下し、滴下した液滴を冷却して平均粒径が100μmのCuボールを造球した。
作製したCuボールの真球度は、CNC画像測定システムを使用して測定した。具体的には、ミツトヨ社製のウルトラクイックビジョン、ULTRA QV350−PRO測定装置を使用した。本実施例では、上記測定装置によりCuボールの長径の長さと直径の長さを測定し、500個の各Cuボールの直径を長径で割った値の算術平均値を算出して真球度を求めた。値が上限である1.00に近いほど真球に近いことを表す。
次に、作製した直径100μmのCuボールの表面に膜厚(片側)2μmのNiめっき層を形成して直径104μmのNiめっきCuボールを作製し、さらにNiめっき層の表面に膜厚18μmのはんだ層を形成して直径140μmのCu核ボールを作製した。はんだ層には、Sn−3Ag−0.5Cu合金を使用した。続けて、作製したCu核ボールを純水を入れたビーカーの中に投入し、攪拌機により10分間撹拌洗浄した。そして、Cu核ボールの酸化膜厚、明度および黄色度を、下記の各実施例および比較例に示す条件でそれぞれ測定した。
続けて、上述した実施例1の焼き試験前のCu核ボールを使用し、このCu核ボールに対して、短い期間にてCu核ボールを長期間保管した状態とするために焼き試験を実施した。続けて、焼き試験を行った後のCu核ボールの酸化膜厚、明度および黄色度をそれぞれ測定した。なお、使用するCu核ボールは、上述したように、10分間の撹拌洗浄が実施されている。
まず、温度25℃(室温)、湿度40%において、恒温槽を150℃に設定し、その状態を1時間以上維持した。実施例1Aでは、撹拌洗浄したCu核ボールをさらに第1の洗浄方法で洗浄した後、洗浄したCu核ボールを上記恒温槽に入れて150℃で3日間保管した。実施例1Bでは、撹拌洗浄したCu核ボールをさらに第2の洗浄方法で洗浄した後、洗浄したCu核ボールを上記恒温槽に入れて150℃で3日間保管した。実施例1Cでは、撹拌洗浄したCu核ボールをさらに第3の洗浄方法で洗浄した後、洗浄したCu核ボールを上記恒温槽に入れて150℃で3日間保管した。比較例1Aでは、上述した撹拌洗浄したCu核ボールを上記恒温槽に入れて150℃で3日間保管した。
2 Cuボール(核)
3 はんだ層(被覆層)
Claims (13)
- 接合物と被接合物との間で間隔を確保する核と、
前記核を被覆するSnまたはSnを主成分とするはんだ合金から構成される被覆層とを備えたはんだ材料において、
150℃の大気湿度下で72時間の焼き試験後のL*a*b*表色系における明度が62.5以上であり、
前記焼き試験前の前記はんだ材料のL*a*b*表色系における明度が65以上、かつ、L*a*b*表色系における黄色度が7.0以下である
ことを特徴とするはんだ材料。 - Ni及びCoから選択される1元素以上からなる層で被覆された前記核が、前記はんだ層で被覆される
ことを特徴とする請求項1に記載のはんだ材料。 - 前記はんだ材料において、前記焼き試験後のL*a*b*表色系における前記明度が70.2以上である
ことを特徴とする請求項1または2に記載のはんだ材料。 - 前記核が球状のCu、Ni、Ag、Bi、Pb、Al、Sn、Fe、Zn、In、Ge、Sb、Co、Mn、Au、Si、Pt、Cr、La、Mo、Nb、Pd、Ti、Zr、Mgからなる群から選択される少なくとも1種類の元素、または樹脂材料によって構成されている
ことを特徴とする請求項1〜3のいずれか1項に記載のはんだ材料。 - 前記核が円柱状のCu、Ni、Ag、Bi、Pb、Al、Sn、Fe、Zn、In、Ge、Sb、Co、Mn、Au、Si、Pt、Cr、La、Mo、Nb、Pd、Ti、Zr、Mgからなる群から選択される少なくとも1種類の元素、または樹脂材料によって構成されている
ことを特徴とする請求項1〜3のいずれか1項に記載のはんだ材料。 - 請求項1〜5のいずれか1項に記載のはんだ材料を使用したはんだ継手。
- 接合物と被接合物との間で間隔を確保する核と、
前記核を被覆するSnまたはSnを主成分とするはんだ合金から構成される被覆層とを備えたはんだ材料において、
150℃の大気湿度下で72時間の焼き試験後の酸化膜厚が4.9nm以下である
ことを特徴とするはんだ材料。 - Ni及びCoから選択される1元素以上からなる層で被覆された前記核が、前記はんだ層で被覆される
ことを特徴とする請求項7に記載のはんだ材料。 - 前記焼き試験後の前記酸化膜厚が3.1nm以下である
ことを特徴とする請求項7または8に記載のはんだ材料。 - 前記核が球状のCu、Ni、Ag、Bi、Pb、Al、Sn、Fe、Zn、In、Ge、Sb、Co、Mn、Au、Si、Pt、Cr、La、Mo、Nb、Pd、Ti、Zr、Mgからなる群から選択される少なくとも1種類の元素、または樹脂材料によって構成されている
ことを特徴とする請求項7〜9のいずれか1項に記載のはんだ材料。 - 前記核が円柱状のCu、Ni、Ag、Bi、Pb、Al、Sn、Fe、Zn、In、Ge、Sb、Co、Mn、Au、Si、Pt、Cr、La、Mo、Nb、Pd、Ti、Zr、Mgからなる群から選択される少なくとも1種類の元素、または樹脂材料によって構成されている
ことを特徴とする請求項7〜9のいずれか1項に記載のはんだ材料。 - 請求項7〜11のいずれか1項に記載のはんだ材料を使用したはんだ継手。
- 接合物と被接合物との間で間隔を確保する核と、当該核を被覆するSnまたはSnを主成分とするはんだ合金から構成される被覆層とを備えたはんだ材料を、150℃の大気湿度下で72時間、加熱する工程と、
前記工程において加熱した前記はんだ材料のL*a*b*表色系における明度が62.5以上となるはんだ材料を取得する工程と、
を有することを特徴とするはんだ材料の検査方法。
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Publication number | Priority date | Publication date | Assignee | Title |
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CN107793758A (zh) * | 2017-11-15 | 2018-03-13 | 江苏亚宝绝缘材料股份有限公司 | 一种碳纳米管复合聚酰亚胺树脂的聚合物及其制备与应用 |
CN107793758B (zh) * | 2017-11-15 | 2020-08-07 | 江苏亚宝绝缘材料股份有限公司 | 一种碳纳米管复合聚酰亚胺树脂的聚合物及其制备与应用 |
CN111560530A (zh) * | 2020-06-12 | 2020-08-21 | 无锡隆达金属材料有限公司 | 一种白铜合金熔液熔炼工艺 |
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TW201715047A (zh) | 2017-05-01 |
TWI680194B (zh) | 2019-12-21 |
US10888957B2 (en) | 2021-01-12 |
JP5850199B1 (ja) | 2016-02-03 |
CN107735212A (zh) | 2018-02-23 |
EP3315245A1 (en) | 2018-05-02 |
EP3315245A4 (en) | 2018-11-21 |
WO2017002704A1 (ja) | 2017-01-05 |
CN107735212B (zh) | 2019-03-08 |
US20180281118A1 (en) | 2018-10-04 |
KR101867796B1 (ko) | 2018-06-15 |
KR20180014217A (ko) | 2018-02-07 |
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