JP7184177B2 - 接合用金属部材及び接合体 - Google Patents
接合用金属部材及び接合体 Download PDFInfo
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- JP7184177B2 JP7184177B2 JP2021519040A JP2021519040A JP7184177B2 JP 7184177 B2 JP7184177 B2 JP 7184177B2 JP 2021519040 A JP2021519040 A JP 2021519040A JP 2021519040 A JP2021519040 A JP 2021519040A JP 7184177 B2 JP7184177 B2 JP 7184177B2
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Images
Classifications
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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
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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
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Description
<1> 平滑部と凹凸部とを一の面に有し、
前記平滑部の表面を基準面としたときに、前記凹凸部が、前記基準面よりも低い位置から前記基準面よりも高い位置まで突出する複数の突起を有し、
前記突起の前記基準面からの平均高さが、50μm以上である接合用金属部材。
<2> 前記複数の突起の少なくとも一部が、根元から先端に向けて縮径した後に拡径する構造を有する<1>に記載の接合用金属部材。
<3> <1>又は<2>に記載の接合用金属部材と、
前記接合用金属部材における前記平滑部と前記凹凸部とを有する面と接合する樹脂部材と、
を有する接合体。
本開示中に段階的に記載されている数値範囲において、一つの数値範囲で記載された上限値又は下限値は、他の段階的な記載の数値範囲の上限値又は下限値に置き換えてもよい。また、本開示中に記載されている数値範囲において、その数値範囲の上限値又は下限値は、実施例に示されている値に置き換えてもよい。
本開示において、各成分には、該当する物質が複数種含まれていてもよい。組成物中に各成分に該当する物質が複数種存在する場合、各成分の含有率又は含有量は、特に断らない限り、組成物中に存在する当該複数種の物質の合計の含有率又は含有量を意味する。
本開示において、各成分に該当する粒子には、複数種の粒子が含まれていてもよい。組成物中に各成分に該当する粒子が複数種存在する場合、各成分の粒子径は、特に断らない限り、組成物中に存在する当該複数種の粒子の混合物についての値を意味する。
本開示において「(メタ)アクリル」はアクリル及びメタクリルの少なくとも一方を意味する。
本開示の接合用金属部材は、平滑部と凹凸部とを一の面に有し、前記平滑部の表面を基準面としたときに、前記凹凸部が、前記基準面よりも低い位置から前記基準面よりも高い位置まで突出する複数の突起を有し、前記突起の前記基準面からの平均高さが、50μm以上とされたものである。
接合用金属部材が、凹凸部が基準面よりも低い位置から基準面よりも高い位置まで突出する複数の突起を有し、突起の基準面からの平均高さが50μm以上であるため、凹凸部に樹脂部材を構成する樹脂が含浸する際に、樹脂が基準面よりも下まで到達しなくとも、基準面よりも高い位置まで突出した突起に樹脂がからみつきやすくなる。その結果、十分なアンカー効果が得られ、接合用金属部材と樹脂部材とが強固に接合することができるためと推察される。
なお、以下の実施形態では、接合用金属部材の一例として、金属部材の表面にレーザー光を照射して凹凸部を設けることで形成された接合用金属部材に基づいて、本開示の接合用金属部材を説明する。ただし、接合用金属部材を構成する材料、接合用金属部材の製造方法等は、特に限定されるものではない。
図2は、接合用金属部材の他の実施形態における凹凸部の断面写真を示し、後述の実施例1におけるアルミニウム製試験片の凹凸部の電子顕微鏡写真の一例に該当する。
平均高さが50μm以上であれば、樹脂部材と接合用金属部材との接合強度が大きくなる傾向にある。なお、平均高さの上限に特に限定はないが、接合用金属部材の生産性の観点及び接合用金属部材へのダメージ軽減の観点から、平均高さは1000μm以下であってもよい。
突起14の基準面からの平均高さは、50μm~1000μmであることが好ましく、70μm~500μmであることがより好ましく、90μm~200μmであることがさらに好ましい。
凹凸部12における突起14の密度は、5個/mm2~50個/mm2であることが好ましく、10個/mm2~30個/mm2であることがより好ましく、10個/mm2~25個/mm2であることがさらに好ましい。
根元から先端に向けて縮径した後に拡径する構造を有する突起の割合は特に限定されるものではなく、全ての突起に占める根元から先端に向けて縮径した後に拡径する構造を有する突起の割合は、50個数%~100個数%であることが好ましく、70個数%~100個数%であることがより好ましく、90個数%~100個数%であることがさらに好ましい。
接合用金属部材における平滑部と凹凸部とを有する面には、メッキ処理、アルマイト処理等の表面処理を施してもよい。
接合用金属部材の凹凸部を有する面は、平面であってもよい。
なお、下記各種条件は、接合用金属部材を構成する金属の種類、突起の高さ等に鑑みて適宜設定されるものである。
CWレーザーの照射速度としては、100mm/sec~2000mm/secであることが好ましい。
CWレーザーの照射速度が100mm/sec以上であれば、金属部材の加工速度を速めることができる傾向にある。CWレーザーの照射速度が2000mm/sec以下であれば、突起の基準面からの平均高さを50μm以上の範囲としやすく、樹脂部材との接合強度がより向上する傾向にある。
例えば、CWレーザーを用いる場合、レーザー出力は300W~2000Wであることが好ましい。
CWレーザーのレーザー出力が300W以上であれば、CWレーザーの照射速度を速めやすくなり、金属部材の加工速度を速めることができる傾向にある。CWレーザーのレーザー出力が2000W以下であれば、レーザー光の照射設備を小型化できる傾向にある。
例えば、レーザーのスポット径としては、10μm~50μmであることが好ましい。
変調CWレーザーの周波数としては、1000Hz~10000Hzであることが好ましい。
変調CWレーザーにおいて、レーザー出力の最大値を100としたときのレーザー出力の最小値は、30以上100未満であることが好ましく、50~95であることがより好ましく、80~90であることがさらに好ましい。
また、レーザー光を一度照射された箇所に、レーザー光を繰り返し照射してもよい。レーザー光を繰り返して照射する場合、繰り返しの回数としては、1回~40回であることが好ましい。
レーザーとしては、グリーンレーザーであってもよい。
本開示の接合体は、本開示の接合用金属部材と、前記接合用金属部材における前記平滑部と前記凹凸部とを有する面と接合する樹脂部材と、を有する。
本開示の接合体では、樹脂部材が、接合用金属部材における平滑部と凹凸部とを有する面と接合するため、接合用金属部材と樹脂部材との接合強度に優れる。
樹脂としては、熱硬化性樹脂、熱可塑性樹脂、エラストマー等が挙げられる。
熱可塑性樹脂の具体例としては、ポリイミド樹脂、ポリアミドイミド樹脂、ポリアミド樹脂、ポリエーテルイミド樹脂、ポリベンゾオキサゾール樹脂、ポリベンゾイミダゾール樹脂、ポリスチレン樹脂、アクリロニトリル・ブタジエン・スチレン共重合樹脂、アクリロニトリル・スチレン共重合樹脂、ポリエチレン樹脂、ポリプロピレン樹脂、ポリ塩化ビニル樹脂、ポリ塩化ビニリデン樹脂、ポリカーボネート樹脂、(メタ)アクリル樹脂、ポリエステル樹脂、ポリアセタール樹脂、ポリフェニレンスルフィド樹脂等が挙げられる。
エラストマーの具体例としては、シリコーンゴム、スチレンブタジエンゴム(SBR)、ニトリルゴム(NBR)、ウレタンゴム等が挙げられる。
さらに、凹凸部の設けられた接合用金属部材と樹脂部材とを接触させて、超音波溶着、振動溶着、誘導溶着、高周波溶着、レーザー溶着、熱溶着、スピン溶着等により接合用金属部材と樹脂部材とを接合してもよい。
また、樹脂部材の接合用金属部材と接合する箇所を加熱して軟化させた後に、樹脂部材と接合用金属部材とを加圧しながら接触させることで、接合用金属部材と樹脂部材とを接合してもよい。
凹凸部における突起の変形を防いで接合強度を向上する観点から、接合体はインサート成形法により製造されたものであることが好ましい。
樹脂部材の成分として熱硬化性樹脂を用いる場合、上記方法により接合用金属部材と樹脂部材とを接合した後、加熱処理することで樹脂部材を硬化してもよい。
試験片100に、ファイバーレーザー(株式会社アマダミヤチ製 ML6811C(CWレーザー))を用いて、凹凸部102を下記条件で形成した。凹凸部102の幅は、1.2mmとした。
図1、図2、図5及び図6から明らかなように、各試験片の凹凸部は、基準面よりも低い位置から基準面よりも高い位置まで突出する複数の突起を有していることが分かる。
なお、各試験片の電子顕微鏡写真の撮影は、日本電子株式会社製のJSM-IT100を用い、20kVの加速電圧で行った。
実施例2の銅製試験片の凹凸部における、突起の基準面からの平均高さを上述のようにして求めたところ、100μmであった。
実施例3の黄銅製試験片の凹凸部における、突起の基準面からの平均高さを上述のようにして求めたところ、110μmであった。
比較例1のアルミニウム製試験片の凹凸部における、突起の基準面からの平均高さを上述のようにして求めたところ、40μmであった。
樹脂部を形成した各試験片を用いて、下記方法により接合強度を評価した。なお、接合強度評価用の試験片を、実施例及び比較例毎に5つ準備した。
株式会社島津製作所製AG-5kNISを用いて、試験速度5mm/minで引張試験を行い、5つの接合体についての接合強度を求めその平均値を算出した。
実施例1のアルミニウム製試験片についての接合強度の平均値は、17.8MPaであった。
実施例2の銅製試験片についての接合強度の平均値は、14.7MPaであった。
実施例3の黄銅製試験片についての接合強度の平均値は、22.4MPaであった。
比較例1のアルミニウム製試験片についての接合強度の平均値は0MPaであった。
12 凹凸部
14 突起
100 試験片
102 凹凸部
104 樹脂部
Claims (2)
- 平滑部と凹凸部とを一の面に有し、
前記平滑部の表面を基準面としたときに、前記凹凸部が、前記基準面よりも低い位置から前記基準面よりも高い位置まで突出する複数の突起を有し、
前記基準面を平面視したときに、前記複数の突起の少なくとも一部が、根元から先端に向けて縮径した後に拡径する構造を有し、
前記突起の前記基準面からの平均高さが、50μm~1000μmである接合用金属部材。 - 請求項1に記載の接合用金属部材と、
前記接合用金属部材における前記平滑部と前記凹凸部とを有する面と接合する樹脂部材と、
を有する接合体。
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