JP7173299B2 - 金属-炭素繊維強化樹脂材料複合体および金属-炭素繊維強化樹脂材料複合体の製造方法 - Google Patents
金属-炭素繊維強化樹脂材料複合体および金属-炭素繊維強化樹脂材料複合体の製造方法 Download PDFInfo
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- B29C43/18—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
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Description
特許文献4には、金属板に有機樹脂と非酸化物セラミックス粒子とを含む導電性を有する塗膜に関する発明が開示されている。しかしながら、この発明に係る鋼板にCFRPを直接貼り付けると電着塗膜は被覆されたが腐食を抑制することはできなかった。特許文献4に記載の金属板のように単に導電性皮膜を金属に被覆することで電着塗装性を付与しても、電着塗装の欠陥部などから腐食因子である水などが金属板に被覆した皮膜とCFRPとの界面に侵入することで異種材料接触腐食が発生する。
(1) 金属部材と、
前記金属部材の表面の少なくとも一部に配置された樹脂皮膜層と、
前記樹脂皮膜層の表面の少なくとも一部に配置され、マトリックス樹脂および当該マトリックス樹脂中に存在する炭素繊維材料を含む炭素繊維強化樹脂材料と、を有し、
前記樹脂皮膜層は、金属粒子、金属間化合物粒子、導電性酸化物粒子、および導電性非酸化物セラミクス粒子のいずれか1種または複数種を導電性粒子として含み、さらに、バインダ樹脂を含み、
前記導電性粒子は、23~27℃の粉体抵抗率が7.0×107Ωcm以下であり、かつZn、Si、Zr、V、Mo、MnおよびWからなる群から選択されるいずれか1種または複数種を構成元素として含み、
前記導電性酸化物粒子が、ドープ型導電性酸化物粒子である、金属-炭素繊維強化樹脂材料複合体。
(2) 前記導電性粒子が、Alドープ型酸化亜鉛、ZrB2、MoSi2 、WSi2、VB2、フェロシリコンおよびフェロマンガンからなる群から選択される1種以上からなる、(1)に記載の金属-炭素繊維強化樹脂材料複合体。
(3) 前記樹脂皮膜層における前記導電性粒子の体積率が、1.0%以上30.0%以下である、(1)または(2)に記載の金属-炭素繊維強化樹脂材料複合体。
(4) 前記樹脂皮膜層の平均厚みが、1.0μm以上200.0μm以下である、(1)~(3)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(5) 前記導電性粒子の平均粒径が、50.0μm以下である、(1)~(4)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(6) 前記樹脂皮膜層の平均厚みをT(μm)、前記導電性粒子の平均粒径をr(μm)とした際に、0.5≦T/r≦300.0の関係を満足する、(1)~(5)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(7) 前記樹脂皮膜層のガラス転移温度が、100℃以下である、(1)~(6)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(8) 前記バインダ樹脂は、エポキシ樹脂、もしくはウレタン樹脂、エポキシ樹脂、ポリエステル樹脂およびメラミン樹脂からなる群から選択される1種または2種以上とエポキシ樹脂を含む樹脂である、(1)~(7)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(9) 前記マトリックス樹脂は、熱可塑性樹脂を含む、(1)~(8)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(10) 前記マトリックス樹脂は、フェノキシ樹脂を含む、(1)~(9)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(11) 前記樹脂皮膜層および/または前記炭素繊維強化樹脂材料上に形成された電着塗装皮膜を有する、(1)~(10)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(12) 前記金属部材が、鋼材またはめっき鋼材である、(1)~(11)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
(13) 導電性粒子およびバインダ樹脂を含む樹脂皮膜層の表面の少なくとも一部に設けられた金属部材と、炭素繊維強化樹脂材料とを前記樹脂皮膜層を介して熱圧着する工程を有し、
前記炭素繊維強化樹脂材料は、マトリックス樹脂および当該マトリックス樹脂中に存在する炭素繊維材料を含み、
前記導電性粒子は、金属粒子、金属間化合物粒子、導電性酸化物粒子および導電性非酸化物セラミクス粒子のいずれか1種または複数種を含み、
前記導電性粒子は、23~27℃の粉体抵抗率が7.0×107Ωcm以下であり、かつZn、Si、Zr、V、Mo、MnおよびWからなる群から選択されるいずれか1種または複数種を構成元素として含み、
前記導電性酸化物粒子が、ドープ型導電性酸化物粒子である、金属-炭素繊維強化樹脂材料複合体の製造方法。
(14) さらに、前記熱圧着する工程前に、前記金属部材を成形する工程を有する、(13)に記載の金属-炭素繊維強化樹脂材料複合体の製造方法。
(15) さらに、前記熱圧着する工程後に、前記金属部材と前記炭素繊維強化樹脂材料とが積層した積層体を成形する工程を有する、(13)に記載の金属-炭素繊維強化樹脂材料複合体の製造方法。
(16) さらに、前記樹脂皮膜層および/または前記炭素繊維強化樹脂材料上に電着塗装により電着塗装皮膜を形成する工程を有する、(13)~(15)のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体の製造方法。
[1.1.金属-炭素繊維強化樹脂材料複合体の構成]
まず、図1を参照しながら、本発明の一実施形態に係る金属-炭素繊維強化樹脂材料複合体の構成について説明する。図1は、本実施形態に係る金属-炭素繊維強化樹脂材料複合体の一例としての金属-炭素繊維強化樹脂材料複合体1の積層方向における断面構造を示す模式図である。
以下、金属-CFRP複合体1の各構成について詳述する。
金属部材11の材質、形状及び厚みなどは、プレス等による成型加工が可能であれば特に限定されるものではないが、形状は薄板状が好ましい。金属部材11の材質としては、例えば、鉄、チタン、アルミニウム、マグネシウム及びこれらの合金などが挙げられる。ここで、合金の例としては、例えば、鉄系合金(ステンレス鋼含む)、Ti系合金、Al系合金、Mg合金などが挙げられる。金属部材11の材質は、鉄鋼材料、鉄系合金、チタン及びアルミニウムであることが好ましく、他の金属種に比べて引張強度が高い鉄鋼材料であることがより好ましい。そのような鉄鋼材料としては、例えば、自動車に用いられる薄板状の鋼板として日本工業規格(JIS)等で規格された一般用、絞り用あるいは超深絞り用の冷間圧延鋼板、自動車用加工性冷間圧延高張力鋼板、一般用や加工用の熱間圧延鋼板、自動車構造用熱間圧延鋼板、自動車用加工性熱間圧延高張力鋼板をはじめとする鉄鋼材料があり、一般構造用や機械構造用として使用される炭素鋼、合金鋼、高張力鋼等も薄板状に限らない鉄鋼材料として挙げることができる。
CFRP層12は、後述する樹脂皮膜層13を介して金属部材11と接合されている。すなわち、CFRP層12は、樹脂皮膜層13の表面上に配置されている。なお、本実施形態においては、本発明が奏する効果を説明することを目的として、樹脂皮膜層13の表面の一部のみにCFRP層12が配置される態様を示したが、本発明は図示の態様に限定されず、樹脂皮膜層13の表面の全てまたは一部において、任意の形状のCFRP層を配置することができる。そして後述する理由により、CFRP層12は、その表面125上において比較的均一な電着塗装皮膜を形成することが可能である。
樹脂皮膜層13は、金属-CFRP複合体1の金属部材11とCFRP層12との間に配置され、これらを接合する。また、樹脂皮膜層13は、腐食環境下において絶縁性を有し、金属部材11とCFRP層12との間を絶縁する。腐食環境としては、具体的には、金属-CFRP複合体1の水濡れ時や水濡れ後等の金属-CFRP複合体1の周囲に水分が付着および/または存在する環境が挙げられる。
次に、上述した実施形態に係る金属-炭素繊維強化樹脂材料複合体1の変形例について説明する。なお、以下に説明する各変形例は、単独で本発明の上記実施形態に適用されてもよいし、組み合わせで本発明の上記実施形態に適用されてもよい。また、各変形例は、本発明の上記実施形態で説明した構成に代えて適用されてもよいし、本発明の上記実施形態で説明した構成に対して追加的に適用されてもよい。図2~図7は、それぞれ、本発明の変形例に係る金属-炭素繊維強化樹脂材料複合体を説明する断面模式図である。
上述した実施形態においては、金属-CFRP複合体1は、金属部材11、CFRP層12および樹脂皮膜層13とからなるものとして説明したが、本発明はこれに限定されない。本発明に係る金属-CFRP複合体1は、これらの各構成の層間または表面に、さらなる層が配置されていてもよい。例えば、図2に示すように、変形例に係る金属-CFRP複合体1Aは、樹脂皮膜層13と、金属部材11との間に、化成処理層14が配置されている。このような化成処理層14が金属部材11と樹脂皮膜層13との間に配置されることにより、金属部材11の耐食性が向上するとともに、金属-CFRP複合体1Aの金属部材11と樹脂皮膜層13との間の密着性が向上する。
また、上述した実施形態では、金属部材11の片面にCFRP層12および樹脂皮膜層13が配置されているものとして説明したが、本発明はこれに限定されない。例えば、図3に示す金属-CFRP複合体1Bのように、金属部材11の両面にCFRP層12および樹脂皮膜層13が配置されていてもよい。また、この場合において、各CFRP層12および樹脂皮膜層13の構成は、互いに異なっていてもよいし、同一であってもよい。
また、CFRP層は、上述した実施形態に限定されず、複数層であってもよい。例えば、図4に示す金属-CFRP複合体1Cのように、CFRP層12Aは、1層に限らず、2層以上であってもよい。CFRP層12Aを複数層とする場合のCFRP層12Aの層数nは、使用目的に応じて適宜設定すればよい。CFRP層12Aが複数層ある場合、各層は、同一の構成であってもよいし、異なっていてもよい。すなわち、CFRP層12Aを構成するマトリックス樹脂123の樹脂種、炭素繊維材料121の種類や含有比率などは、層ごとに異なっていてもよい。
また、上述した実施形態では、電着塗装を施していない金属-CFRP複合体1について説明したが、本発明はこれに限定されず、例えば、図5~7に示す金属-CFRP複合体1D、1E、1Fのように、CFRP層12および樹脂皮膜層13上に電着塗装皮膜15が形成されていてもよい。
上述した実施形態においては、金属-CFRP複合体1が板状である場合について模式的に説明したが、本発明はこれに限定されず、当然、本発明に係る金属-CFRP複合体は成形されていてもよい。
次に、本発明の実施形態に係る金属-炭素繊維強化樹脂材料複合体の製造方法について説明する。本発明の一実施形態に係る金属-炭素繊維強化樹脂材料複合体の製造方法は、導電性粒子およびバインダ樹脂を含む樹脂皮膜層の表面の少なくとも一部に設けられた金属部材と炭素繊維強化樹脂材料とを上記樹脂皮膜層を介して熱圧着する工程を有する。また、上記熱圧着する工程前後において、金属部材または当該金属部材と炭素繊維強化樹脂材料とが積層した積層体を成形する工程を有してもよい。以下、成形が行われることを前提として、本発明の実施形態に係る金属-炭素繊維強化樹脂材料複合体の製造方法を詳細に説明するが、成形が省略されてもよいことはいうまでもない。
図8および図9は、本発明の第1の実施形態に係る金属-CFRP複合体の製造方法を説明する模式図である。第1の実施形態に係る金属-CFRP複合体1Gの製造方法は、樹脂皮膜層13Aが表面の少なくとも一部に設けられた金属部材11Aと炭素繊維強化樹脂材料(CFRPまたはCFRP形成用プリプレグ)とを樹脂皮膜層13Aを介して熱圧着して、積層体100を得る熱圧着工程Aを少なくとも有する。また、本実施形態に係る金属-CFRP複合体1Gの製造方法は、積層体100を成形工程Aと、を有する。
さらに、本実施形態においては、必要に応じて、金属部材11Aの表面の少なくとも一部に樹脂皮膜層13Aを形成する樹脂皮膜層形成工程、電着塗装工程、前処理工程および/または後工程を含み得る。以下、各工程について説明する。
まず、金属部材11Aを用意する(図8(a))。金属部材11に対しては、必要に応じて一般に公知の脱脂を行うことが好ましい。脱脂方法は溶剤でふき取る方法、水洗する、界面活性剤を含む水溶液もしくは洗剤で洗う方法、加熱して油成分を揮発させる方法、アルカリ脱脂など一般に公知の方法も用いることができる。アルカリ脱脂が工業的には一般的であり、脱脂効果が高いため好適である。また、使用する金型への離型処理や金属部材11A表面の付着物の除去(ゴミ取り)を行うことがより好ましい。これらの前処理により、金属部材11Aと、樹脂皮膜層13Aとの密着性が向上する。
次に、金属部材11Aの表面に対し、樹脂皮膜層13Aを形成する(図8(b))。樹脂皮膜層13Aの形成は、樹脂皮膜層13Aの材料を含む樹脂皮膜層材料組成物を金属部材11Aの表面に対し塗工し、乾燥・焼付することにより行われる。樹脂皮膜層材料組成物は、液状またはスラリー状であってもよいし、粉末状であってもよい。予め板状に成形した樹脂皮膜層材料組成物としてのシートを熱圧着などで貼り付けても良い。
次に、金属部材11Aと炭素繊維強化樹脂材料(CFRPまたはCFRP形成用プリプレグ)とを樹脂皮膜層13Aを介して熱圧着し、積層体100を得る(図8(c))。具体的には、CFRP層12BとなるCFRP成形用プリプレグ(またはCFRP)を樹脂皮膜層13A上に積層した積層体を加圧機に設置し、加熱しつつ加圧を行う。これにより、金属部材11Aと、樹脂皮膜層13Aと、CFRP層12Bとがこの順で積層した積層体100が製造される。
熱圧着温度は、特に限定されないが、例えば、100℃以上400℃以下の範囲内、好ましくは150℃以上300℃以下、より好ましくは160℃以上270℃以下の範囲内、さらに好ましくは180℃以上250℃以下の範囲内である。このような温度範囲内において、結晶性樹脂であれば融点以上の温度がより好ましく、非結晶性樹脂であればTg+150℃以上の温度がより好ましい。上記上限温度以下であることにより、過剰な熱を加えてしまうことを抑制することができ樹脂の分解を防止できる。また、上記下限温度以上であることにより、樹脂の溶融粘度が適度とすることができ、CFRPへの付着性及びCFRP基材への含浸性を優れたものにすることができる。
樹脂皮膜層13Aを形成するための接着樹脂組成物や、マトリックス樹脂123を形成するための原料樹脂として、フェノキシ樹脂(A)に架橋性硬化樹脂(B)及び架橋剤(C)を含有した架橋性接着樹脂組成物を使用する場合、さらに、追加の加熱工程を含めてもよい。
次に、積層体100を成形し(図9(d))、金属-CFRP複合体1Gを得る。積層体100の成形方法は、特に限定されず、例えばせん断加工、曲げ加工、絞り加工、鍛造加工等の各種プレス加工を採用することができる。
また、必要に応じて、得られた金属-CFRP複合体1Gの樹脂皮膜層13Aおよび/またはCFRP層12B上に電着塗装により電着塗装皮膜を形成してもよい。CFRP層12B上に電着塗装が施されていると耐食性がより優れるため好適である。金属-CFRP複合体1Gは、電着塗装性に優れ、比較的均一な膜厚の電着塗装皮膜が形成される。なお、本工程における電着塗装の条件は、特に限定されず、公知の塗料および条件を採用して行うことができる。電着塗装の塗料としては、市販のものを使用することもできる。また、電着塗装を行う前に、前処理として、一般に公知の脱脂、表面調整、リン酸亜鉛処理もしくはジルコニア処理を施すことができる。これら脱脂剤、表面調整剤、リン酸亜鉛処理剤、ジルコニア処理剤は市販のものを使用しても良い。
金属-CFRP複合体1Dに対する後工程では、必要に応じて、塗装の他、ボルトやリベット留めなどによる他の部材との機械的な接合のため、穴あけ加工、接着接合のための接着剤の塗布などが行われる。
図10および図11は、本発明の第2の実施形態に係る金属-CFRP複合体の製造方法を説明する模式図である。第2の実施形態に係る金属-CFRP複合体1Hの製造方法は、樹脂皮膜層13Bの表面の少なくとも一部に設けられた金属部材11Bを成形する成形工程Bと、金属部材11Bと、炭素繊維強化樹脂材料とを樹脂皮膜層13Bを介して熱圧着し、金属-CFRP複合体1Hを得る熱圧着工程Bとを有する。
(金属板の準備)
成分がC:0.131質量%、Si:1.19質量%、Mn:1.92%、P:0.009質量%、S:0.0025質量%、Al:0.027質量%、N:0.0032質量%、残部はFeからなる鋼を熱間圧延、酸洗後、冷間圧延を行い、厚さ1.0mmの冷延鋼板を得た。次に、作製した冷延鋼板を連続焼鈍装置で最高到達板温が820℃となる条件で焼鈍した。焼鈍工程の焼鈍炉内のガス雰囲気は、1.0体積%のH2を含むN2雰囲気とした。作製した冷延鋼板を「CR」と称す。
また、めっきした鋼板のめっきの付着量は、GAは45g/m2、GA以外のめっきは60g/m2とした。
また、上記以外に、別途鋼板以外の金属板として、アルミニウム合金板(以下「Al板」と称する)およびマグネシウム合金板(以下「Mg合金板」と称する)も用意した。
作製した金属板を日本パーカライジング社製アルカリ脱脂剤「ファインクリーナーE6404」で脱脂した。
(化成処理工程)
脱脂した金属板上にγ-アミノプロピルトリエトキシシランを2.5g/L、水分散シリカ(日産化学社製「スノーテックN」を1g/L、水溶性アクリル樹脂(試薬のポリアクリル酸)を3g/L添加した水溶液をバーコーターで塗布し、熱風オーブンで到達板温が150℃となる条件で乾燥させた。また、炭酸ジルコニウムアンモニウム水溶液3g/L水溶液、及び日本パーカライジング社製クロメート処理液「ZM-1300AN」についても同様に、それぞれバーコーターで塗布し、熱風オーブンで到達板温が150℃となる条件で乾燥させた。以降、水分散シリカを含む水溶液を塗布したものを「Si系処理」(または単に「Si系」)、炭酸ジルコニウムアンモニウム水溶液で塗布したものを「Zr系処理」(または単に「Zr系」)、クロメート処理液で処理したものを「Cr系処理」(または単に「Cr系」)と称する。
バインダー樹脂として三菱ケミカル社製エポキシ樹脂「jER(R)828」、三井化学社製ウレタン変性エポキシ樹脂「エポキー(R)802-30CX」、東洋紡社製ポリエステル樹脂「バイロン(R)300」を準備した。また、硬化剤として三菱ガス化学社製アミン「MXDA(メタキシレンジアミン)」、宇部興産社製「1,12-ドデカメチレンジアミン」、三井化学社製メラミン「ユーバン(R)20SB」、第一工業製薬社製水性ウレタン樹脂「スーパーフレックス(R)150」、サイテック社製メラミン樹脂「サイメル(R)325」を準備した。
次にこれら樹脂と硬化剤を混合することで、以下の皮膜樹脂サンプルを作製した。
・エポキシ樹脂-B:三菱ケミカル社製「jER(R)828」を100質量部に対して三菱ガス化学社製「MXDA(メタキシレンジアミン)」を30質量部添加して混合した。
・ポリエステル/メラミン樹脂:東洋紡社製「バイロン(R)300」を溶剤であるシクロヘキサノンに30質量%溶解したものの固形分100質量部に対して三井化学社製「ユーバン(R)20SB」を固形分で20質量部添加して混合した。
・ポリエステル/エポキシ樹脂:東洋紡社製「バイロン(R)300」を溶剤であるシクロヘキサノンに30質量%溶解したものの固形分100質量部に対して三井化学社製「ユーバン(R)20SB」を固形分で20質量部、および、新日鉄住金化学社製のBPA型エポキシ樹脂「YD-013」を5質量部添加して混合した。
・ウレタン/メラミン樹脂:第一工業製薬社製水性ウレタン樹脂「スーパーフレックス(R)150」の固形分80質量部に、サイテック社製メラミン樹脂「サイメル(R)325」を固形分で20質量部添加して混合した。
・Alドープ型酸化亜鉛:ハクステック社製導電性酸化亜鉛(Al-Doped ZnO)「23-K」、1次粒径120~250nm(カタログ値)を用いた。以降「Al-ZnO」と称する。
・フェロシリコン:丸紅テツゲン社製のフェロシリコンを粉砕機で微粒子状に粉砕し、ふるいを用いて分級し平均粒径3μm、9μm、47μm、98μmとしたものを用いた。以降「Fe-Si」と称す。
・ホウ化ジルコニウム:日本新金属社製「ZrB2-O」をふるいにて分級し、平均粒径2μmにしたものを用いた。以降、「ZrB2」と称する。
・ホウ化クロム:日本新金属社製「CrB2-O」をふるいにて分級し、平均粒径5μmにしたものを用いた。以降、「CrB2」と称する。
・ニッケル:試薬のニッケル粉末を、ふるいを用いて分級し平均粒径5μmとしたものを用いた。以降「Ni」と称する。
・酸化チタン:石原産業社製「タイペーク(R)CR-95」、平均粒径0.28μm(カタログ値)を用いた。以降「TiO2」と称する。
・導電性酸化チタン:石原産業社製Snドープ型酸化チタン「ET-500W」平均粒径2~3μm(カタログ値)を用いた。以降「導電Ti」と称する。
新日鉄住金化学株式会社製ビスフェノールA型フェノキシ樹脂「フェノトートYP-50S」(Mw=40,000、水酸基当量=284g/eq、250℃における溶融粘度=90Pa・s、Tg=83℃)を粉砕、分級した平均粒子径D50が80μmである粉体を、炭素繊維からなる強化繊維基材(クロス材:東邦テナックス社製、IMS60)に、静電場において、電荷70kV、吹き付け空気圧0.32MPaの条件で粉体塗装を行った。その後、オーブンで170℃、1分間加熱溶融して樹脂を熱融着させ、厚み0.65mm、弾性率75[GPa]、引張荷重13500[N]、Vf(繊維体積含有率)60%のフェノキシ樹脂CFRPプリプレグを作製した。プリプレグのサイズは金属板と同じサイズとした。
1.電着塗装性
作製した巾70mm×長さ150mmの複合体サンプルを用いて、脱脂、表面調整、リン酸亜鉛処理を行った後に電着塗装を施した。脱脂は、日本パーカライジング社製脱脂剤「ファインクリーナーE6408」を用いて、60℃の条件で5分間浸漬して脱脂した。脱脂したサンプルを表面調整は日本パーカライジング社製「プレパレンX」を用いて、40℃の条件で5分浸漬した。その後に日本パーカライジング社製リン酸亜鉛化成剤「パルボンドL3065」を用いて35℃の条件で3分間浸漬することで、リン酸亜鉛処理を行った。リン酸亜鉛処理を行った後は水洗して150℃雰囲気のオーブンで乾燥させた。その後、日本ペイント社製の電着塗料「パワーフロート1200」を各水準サンプルに用いている金属板が無処理(樹脂皮膜層やCFRP層、化成処理がなしの状態)で塗装したときに15μmとなる条件で電着塗装し、170℃雰囲気のオーブンで20分焼き付けたものをサンプルとして用いた。電着塗装はCFRPを貼り付けていない金属部分のみ塗装された。
作製したサンプルのCFRP状を目視で観察し、電着塗装が施されているか否かを評価した。
作製したサンプルを用いてサイクル腐食試験(CCT)を行った。CCTのモードは自動車工業規格JASO-M609に準じて行った。サンプルはCFRP側を評価面として、評価面に塩水が噴霧されるように試験機に設置して試験した。
試験は15サイクル(8時間で1サイクル)毎にサンプル外観を目視観察し、赤錆が発生するサイクルを求めた。赤錆が発生するまでのサイクル数が多いものほど、耐食性に優れる。また、赤錆は金属に貼り付けたCFRPの端付近から発生するため、そこに着目して観察した。なお、用いる金属板がアルミニウム合金板及びマグネシウム合金板の場合は、鉄の酸化物である赤錆が発生しないため、アルミニウムやマグネシウムの酸化物である白錆が発生するサイクル数を求めた。
巾30mm×長さ100mmの複合体サンプルを用いて試験した。本サンプルは金属板の片面側全面にCFRPを貼り付けたものを用いた。サンプルを支点間距離60mmの治具に載せて支点間の中央に荷重をかけることで3点曲げ試験を行った。荷重をかける側をCFRP側となるように治具にサンプルを設置して試験した。3点曲げ試験にて荷重を掛けたときにサンプルがたわんだときの金属板とCFRPの剥離状態を観察して評価した。たわみが1.0mm以下で剥離した場合「D」、1.0mm超3.0mm以下で剥離した場合「C」、3.0mm超5.0mm以下で剥離した場合「B」、5.0mm超で剥離した場合「A」と評価した。
V字型の凹凸金型を200℃に加熱した状態での熱間加工におけるプレス加工性を、巾50mm×長さ50mmの複合体サンプルを用いて試験した。本サンプルは金属板の片面側全面にCFRPを貼り付けたものを用い、凹金型側をCFRP、凸金型側を金属材となるように金型に設置して、プレスを行った。なおV字型金型のV部の角度は90°の金型を用い、曲げ部のR(曲率半径)の異なる金型を使ったプレス加工をそれぞれ行い、CFRPが剥離しない限界Rを求めた。より小さい曲げRでも剥離しないものほどプレス成形性に優れる。
電着塗装したサンプルについて、樹脂皮膜層上、CFRP層上、CFRP端面について垂直断面を光学顕微鏡にて観察し、電着塗膜の膜厚を評価した。なお、電着塗膜の膜厚は任意の3視野について測定し、その平均値とした。皮膜層上の電着塗膜の膜厚が10μm以上の場合は「A」、5μm以上10μm未満の場合は「B」、2μm以上5μm未満の場合は「C」、1μm以上2μm未満の場合は「D」、1μm未満の場合は「E」と評価した。そして、評価が「A」~「D」のサンプルを合格品、「E」のサンプルを不合格品とした。
11、11A、11B 金属部材
12、12A、12B、12C CFRP層
121 炭素繊維材料
123 マトリックス樹脂
13、13A、13B 樹脂皮膜層
131 導電性粒子
133 バインダ樹脂
14 化成処理層
15 電着塗装皮膜
Claims (16)
- 金属部材と、
前記金属部材の表面の少なくとも一部に配置された樹脂皮膜層と、
前記樹脂皮膜層の表面の少なくとも一部に配置され、マトリックス樹脂および当該マトリックス樹脂中に存在する炭素繊維材料を含む炭素繊維強化樹脂材料と、を有し、
前記樹脂皮膜層は、金属粒子、金属間化合物粒子、導電性酸化物粒子、および導電性非酸化物セラミクス粒子のいずれか1種または複数種を導電性粒子として含み、さらに、バインダ樹脂を含み、
前記導電性粒子は、23~27℃の粉体抵抗率が7.0×107Ωcm以下であり、かつZn、Si、Zr、V、Mo、MnおよびWからなる群から選択されるいずれか1種または複数種を構成元素として含み、
前記導電性酸化物粒子が、ドープ型導電性酸化物粒子である、金属-炭素繊維強化樹脂材料複合体。 - 前記導電性粒子が、Alドープ型酸化亜鉛、ZrB2、MoSi2、WSi2、VB2、フェロシリコンおよびフェロマンガンからなる群から選択される1種以上からなる、請求項1に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記樹脂皮膜層における前記導電性粒子の体積率が、1.0%以上30.0%以下である、請求項1または2に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記樹脂皮膜層の平均厚みが、1.0μm以上200.0μm以下である、請求項1~3のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記導電性粒子の平均粒径が、50.0μm以下である、請求項1~4のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記樹脂皮膜層の平均厚みをT(μm)、前記導電性粒子の平均粒径をr(μm)とした際に、0.5≦T/r≦300.0の関係を満足する、請求項1~5のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記樹脂皮膜層のガラス転移温度が、100℃以下である、請求項1~6のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記バインダ樹脂は、エポキシ樹脂、またはウレタン樹脂、ポリエステル樹脂およびメラミン樹脂からなる群から選択される1種または2種以上とエポキシ樹脂とを含む樹脂である、請求項1~7のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記マトリックス樹脂は、熱可塑性樹脂を含む、請求項1~8のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記マトリックス樹脂は、フェノキシ樹脂を含む、請求項1~9のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記樹脂皮膜層および/または前記炭素繊維強化樹脂材料上に形成された電着塗装皮膜を有する、請求項1~10のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 前記金属部材が、鋼材またはめっき鋼材である、請求項1~11のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体。
- 導電性粒子およびバインダ樹脂を含む樹脂皮膜層の表面の少なくとも一部に設けられた金属部材と、炭素繊維強化樹脂材料とを前記樹脂皮膜層を介して熱圧着する工程を有し、
前記導電性粒子は、金属粒子、金属間化合物粒子、導電性酸化物粒子および導電性非酸化物セラミクス粒子のいずれか1種または複数種を含み、
前記導電性粒子は、23~27℃の粉体抵抗率が7.0×107Ωcm以下であり、かつZn、Si、Zr、V、Mo、MnおよびWからなる群から選択されるいずれか1種または複数種を構成元素として含み、
前記導電性酸化物粒子が、ドープ型導電性酸化物粒子である、金属-炭素繊維強化樹脂材料複合体の製造方法。 - さらに、前記熱圧着する工程前に、前記金属部材を成形する工程を有する、請求項13に記載の金属-炭素繊維強化樹脂材料複合体の製造方法。
- さらに、前記熱圧着する工程後に、前記金属部材と前記炭素繊維強化樹脂材料とが積層した積層体を成形する工程を有する、請求項13に記載の金属-炭素繊維強化樹脂材料複合体の製造方法。
- さらに、前記樹脂皮膜層および/または前記炭素繊維強化樹脂材料上に電着塗装により電着塗装皮膜を形成する工程を有する、請求項13~15のいずれか一項に記載の金属-炭素繊維強化樹脂材料複合体の製造方法。
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