JP6709944B2 - 接合構造体の製造方法 - Google Patents
接合構造体の製造方法 Download PDFInfo
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- JP6709944B2 JP6709944B2 JP2018186574A JP2018186574A JP6709944B2 JP 6709944 B2 JP6709944 B2 JP 6709944B2 JP 2018186574 A JP2018186574 A JP 2018186574A JP 2018186574 A JP2018186574 A JP 2018186574A JP 6709944 B2 JP6709944 B2 JP 6709944B2
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- reflow
- pressure
- test
- solder
- manufacturing
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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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/008—Soldering within a furnace
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- 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
- B23K1/00—Soldering, e.g. brazing, or unsoldering
- B23K1/0008—Soldering, e.g. brazing, or unsoldering specially adapted for particular articles or work
- B23K1/0016—Brazing of electronic components
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- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
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Description
本実施形態に係る接合構造体の製造方法は、リフロー炉内で、はんだ材料を介して基板(第1部材)と接合部品(第2部材)とを接触させた状態で加熱し、前記はんだ材料を構成するはんだ合金を溶融させるリフロー工程を備える接合構造体の製造方法であって、前記リフロー工程は、前記リフロー炉内の雰囲気を大気圧よりも低い第1圧力P1まで減圧した状態で前記はんだ合金を溶融させる第1リフロー工程と、前記第1リフロー工程後、前記リフロー炉内の雰囲気を前記第1圧力P1よりも低い第2圧力P2まで減圧した状態で前記はんだ合金を溶融させる第2リフロー工程と、を含む。
<試験基板の作製>
(試験No.1−1〜1−14)
合金A(96.5Sn/3.0Ag/0.5Cu)からなるはんだ箔(サイズ:10×10mm、厚さ:100μm)を介して、無酸素Cu板(サイズ:44×35mm)の基板と、Au/NiめっきされたSiチップ(サイズ:10×10mm)とが接触した状態でリフロー装置(商品名:VS1、オリジン電気社製)のリフロー炉内に配置した。そして、後述する予熱工程及びリフロー工程を行うことにより、試験No.1−1〜1−14の試験基板を作製した。
前記第2リフロー工程を行わなかったこと以外は、試験No.1−1〜1−14と同様に試験No.2−1〜2−6の試験基板を作製した。リフロー工程の詳細な条件を表1に示す。
合金A(96.5Sn/3.0Ag/0.5Cu)からなるはんだ箔(サイズ:15×15mm、厚さ:100μm)を介して、NiめっきCu板(サイズ:44×35mm)の基板と、Ni板(サイズ:15×15mm)とが接触した状態でリフロー装置(商品名:VS1、オリジン電気社製)のリフロー炉内に配置した。リフロー工程では、ピーク温度まで大気圧で昇温し、ピーク温度に到達してから第1圧力P1へ減圧を行ったこと以外は、試験No.1−1〜1−14と同様に試験基板を作製した。リフロー工程の詳細な条件を表1に示す。
前記第2リフロー工程を行わなかったこと以外は、試験No.1−15と同様に試験基板を作製した。リフロー工程の詳細な条件を表1に示す。
各試験基板のSiチップ搭載箇所におけるX線透過写真を撮影した。撮影装置はTUX−3100(マース東研社製)を用い、撮影条件は管電圧:75.0V、管電流:80.0μA、フィラメント電流:3.130Aとした。次に、撮影した写真を二値化処理することにより、接合部のボイド率を算出した。なお、試験No.1−1〜1−14の試験基板は、試験No.2−1〜2−6の試験基板のうち、第1リフロー工程における第1圧力P1の値、並びに、第1リフロー工程及び第2リフロー工程におけるピーク温度での合計保持時間(T1+T2)が等しい試験基板と比較することにより、ボイド率の低減率を算出した。結果を表1に示す。
各試験基板を上面から目視で観察し、下記の基準に基づき評価した。
◎:飛散がほとんど無かった。
○:飛散がわずかに確認された。
×:飛散が多く確認された。
<試験基板の作製>
(試験No.3−1)
まず、合金A(96.5Sn/3.0Ag/0.5Cu)粉末とフラックス(2−エチルー1,3−ヘキサンジオール:90質量%、ステアリン酸アミド:10質量%)とを混合して、ソルダペーストを作製した。次に、無酸素Cu板(サイズ:44×35mm)の基板に該ソルダペーストを、厚さ200μmのメタルマスクを用いて開口率100%となるように塗布した。塗布したソルダペーストの厚さは200μmであった。その後、Au/NiめっきされたSiチップ(サイズ:10×10mm)を搭載し、該ソルダペーストを介して、無酸素Cu板(サイズ:44×35mm)の基板と、Au/NiめっきされたSiチップ(サイズ:10×10mm)とが接触した状態でリフロー装置(商品名:VS1、オリジン電気社製)のリフロー炉内に配置した。そして、後述する予熱工程及びリフロー工程を行うことにより、試験No.3−1の試験基板を作製した。
予熱工程を窒素雰囲気下で行ったこと以外は、試験No.3−1と同様に試験基板を作製した。
予熱工程を行わず、ギ酸雰囲気下において、リフロー炉内の雰囲気を第1圧力P1へ減圧した後、ピーク温度まで加熱したこと以外は、試験No.3−1と同様に試験基板を作製した。
はんだ粉末として合金B(89.0Sn/3.0Ag/8.0Sb)を用い、リフロー工程におけるピーク温度を変更したこと以外は、試験No.3−1と同様に試験基板を作製した。
はんだ粉末として合金C(95.0Pb/5.0Sn)を用い、予熱保持温度を230℃とし、さらに、リフロー工程における第1圧力P1及びピーク温度を変更したこと以外は、試験No.3−1と同様に試験基板を作製した。リフロー工程の詳細な条件を表2に示す。
第2リフロー工程を行わなかったこと以外は、それぞれ、試験No.3−1〜3−5と同様に試験No.4−1〜4−5の試験基板を作製した。リフロー工程の詳細な条件を表2に示す。
試験1と同様の方法で、ボイドの評価を行った。結果を表2に示す。
試験1と同様の方法で、ボイドの評価を行った。結果を表2に示す。
<試験基板の作製>
(試験No.5)
まず、合金A(96.5Sn/3.0Ag/0.5Cu)粉末とフラックスとを混合して、ソルダペーストを作製した。前記フラックスは、ペーストフラックス(弘輝社製、製品名:ペーストフラックス(RMAタイプ))を用いた。次に、ガラスエポキシ基板(サイズ:50×50mm、厚み:1.6mm)を準備した。前記基板上には銅箔にてφ0.2mmのパターンを形成し、プリフラックス(商品名「タフエース」、四国化成社製)で処理した。前記基板に前記ソルダペーストを、厚さ150μmのメタルマスクを用いて開口率400%となるように塗布し、リフロー装置(商品名:VS1、オリジン電気社製)のリフロー炉内に配置した。塗布したソルダペーストの厚さは150μmであった。そして、後述する予熱工程及びリフロー工程を行うことにより、試験No.5の試験基板を作製した。
第2リフロー工程を行わなかったこと以外は、試験No.5と同様に試験No.6の試験基板を作製した。リフロー工程の詳細な条件を表3に示す。
試験1と同様の方法で、ボイドの評価を行った。結果を表3に示す。
試験1と同様の方法で、ボイドの評価を行った。結果を表3に示す。
Claims (6)
- リフロー炉内で、はんだ材料と第1部材とを接触させた状態で加熱し、前記はんだ材料を構成するはんだ合金を溶融させるリフロー工程を備える接合構造体の製造方法であって、
前記リフロー工程は、
前記リフロー炉内の雰囲気を大気圧から第1圧力P1まで減圧した状態で保持し、前記はんだ合金を溶融させる第1リフロー工程と、
前記第1リフロー工程後、前記リフロー炉内の雰囲気を前記第1圧力P1よりも低い第2圧力P2まで減圧した状態で前記はんだ合金を溶融させる第2リフロー工程と、
を含む、接合構造体の製造方法。 - 前記リフロー工程は、リフロー炉内で、はんだ材料を介して第1部材と第2部材とを接触させた状態で加熱し、前記はんだ材料を構成するはんだ合金を溶融させる、請求項1に記載の接合構造体の製造方法。
- 前記第1圧力P1に対する前記第2圧力P2の比(P2/P1)は、0.0017〜0.8である、請求項1又は2に記載の接合構造体の製造方法。
- 前記第1リフロー工程では、ピーク温度で第1保持時間T1保持し、
前記第2リフロー工程では、ピーク温度で第2保持時間T2保持し、
前記第1保持時間T1に対する前記第2保持時間T2の比(T2/T1)は、0.017〜59である、請求項1〜3のいずれか一つに記載の接合構造体の製造方法。 - 前記リフロー工程は、さらに、前記第2リフロー工程後、前記はんだ合金の融点以上の温度で、前記リフロー炉内の雰囲気を大気圧まで加圧する第3リフロー工程を含む、請求項1〜4のいずれか一つに記載の接合構造体の製造方法。
- 前記第1圧力P 1 が200Pa〜30000Paであり、前記第2圧力P 2 が50Pa〜5000Paである、請求項1〜5のいずれか一つに記載の接合構造体の製造方法。
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