JP7080427B1 - 複合シート、積層体、及び、複合シートの接着性を推定する評価方法 - Google Patents
複合シート、積層体、及び、複合シートの接着性を推定する評価方法 Download PDFInfo
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- JP7080427B1 JP7080427B1 JP2022522040A JP2022522040A JP7080427B1 JP 7080427 B1 JP7080427 B1 JP 7080427B1 JP 2022522040 A JP2022522040 A JP 2022522040A JP 2022522040 A JP2022522040 A JP 2022522040A JP 7080427 B1 JP7080427 B1 JP 7080427B1
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Abstract
Description
気孔率(体積%)=[1-(B/A)]×100 … 式(1)
<窒化物焼結体(セラミックス焼結体)の作製>
新日本電工株式会社製のオルトホウ酸100質量部と、デンカ株式会社製のアセチレンブラック(商品名:HS100)35質量部とをヘンシェルミキサーを用いて混合した。得られた混合物を、黒鉛製のルツボ中に充填し、アーク炉にて、アルゴン雰囲気で、2200℃にて5時間加熱し、塊状の炭化ホウ素(B4C)を得た。得られた塊状物を、ジョークラッシャーで粗粉砕して粗粉を得た。この粗粉を、炭化珪素製のボール(φ10mm)を有するボールミルによってさらに粉砕して粉砕粉を得た。
得られた窒化ホウ素焼結体について、株式会社島津製作所製の水銀ポロシメーター(装置名:オートポアIV9500)を用い、0.0042MPaから206.8MPaまで圧力を増加しながら細孔容積分布を測定した。積算細孔容積が全細孔容積の50%に達する細孔径を、「平均細孔径」とした。結果を表1に示す。
市販のビスマレイミド(BMI-80(ケイ・アイ化成株式会社製、商品名)10質量部、エポキシ樹脂(三菱ケミカル株式会社製、商品名:エピコート807)29.5質量部、及び市販のシアネート樹脂(三菱ガス化学株式会社製、商品名:TACN)60質量部に対し、市販の硬化剤(日本合成化学工業株式会社製、商品名:アクメックスH-84B)を0.5質量部配合して、樹脂組成物を調製した。調製した樹脂組成物を120℃で5時間加熱することで樹脂組成物の半硬化物である樹脂を調製した。
調製した樹脂におけるトリアジン環の含有量を炭素-13核磁気共鳴分光法(13C-NMR)で測定した。測定には、NMR装置(BrukerAVANCE NEO)及びプローブ(CryoProbe)を用いた。測定条件は、積算回数:256回とした。
調製した樹脂におけるトリアジン環に対応する赤外吸収強度を赤外線吸収スペクトル法(IR)の全反射測定方法(ATR法)で測定した。測定には、1回反射ATRアクセサリ(SensIR社製、Dura Scope)、及びフーリエ変換赤外分光分析装置(パーキンエルマー社製、商品名:Spectrum One)を用いた。測定は、ATR法によって行った。測定条件は、分解能:4cm-1、積算回数:16回とした。
得られた樹脂を、120℃を維持したまま160℃に加熱された窒化ホウ素焼結体の主面に滴下した。大気圧下、窒化ホウ素焼結体の主面に滴下した樹脂組成物をゴム製のヘラを用いて塗り伸ばし、主面全体に樹脂を塗り広げて樹脂含浸体を得た。このようにして、四角柱状の複合シート(縦×横×厚さ=縦×横×厚み=50mm×50mm×0.31mm)を作製した。
複合シートに含まれる樹脂の充填率を、以下の式(2)によって求めた。結果は表1に示すとおりであった。
シート状の銅箔(縦×横×厚み=100mm×20mm×0.035mm)と、シート状の銅板(縦×横×厚み=100mm×20mm×1mm)との間に、上述の複合シート(縦×横×厚み=50mm×20mm×0.31mm)を配置して、銅箔、複合シート及び銅板をこの順に備える積層体を作製した。当該積層体を200℃及び5MPaの条件下で5分間加熱及び加圧した後、200℃及び大気圧の条件下で2時間加熱処理した。これによって積層体を得た。
上述の処理を施したのち、JIS K 6854-1:1999「接着剤-はく離接着強さ試験方法」に準拠して、90°はく離試験を、万能試験機(株式会社エーアンドディ製、商品名:RTG-1310)を用いて実施した。なお、はく離はシート状の銅箔と複合シートの接着界面において行った。試験速度:50mm/min、ロードセル:5kN、測定温度:室温(20℃)の条件で測定を行って、はく離面における凝集破壊部分の面積比率を測定した。測定結果から、以下の基準で接着性を評価した。結果を表1に示す。なお、凝集破壊部分とは、複合シートが破壊した部分の面積であり、この面積比率が大きい方が接着性に優れることを示している。
A:凝集破壊部分の面積比率が70面積%以上である。
B:凝集破壊部分の面積比率が50面積%以上70面積%未満である。
C:凝集破壊部分の面積比率が50面積%未満である。
樹脂組成物の加熱時間を11時間に変更したこと以外は、実施例1と同様にして、複合シート及び積層体を製造した。
セラミックス焼結体として表1に示す厚み及び平均細孔径を有する窒化ホウ素焼結体を用い、且つ樹脂組成物の加熱時間を11時間に変更したこと以外は、実施例1と同様にして、複合シート及び積層体を製造した。
樹脂組成物の加熱時間を3時間に変更したこと以外は、実施例1と同様にして、複合シート及び積層体を製造した。
樹脂組成物の加熱時間を14時間に変更したこと以外は、実施例1と同様にして、複合シート及び積層体を製造した。
セラミックス焼結体として表1に示す厚み及び平均細孔径を有する窒化ホウ素焼結体を用いた以外は、実施例1と同様にして、複合シート及び積層体を製造した。
Claims (5)
- 厚みが2mm未満である多孔質のセラミックス焼結体と、
前記セラミックス焼結体の気孔に充填されている樹脂と、を含み、
前記樹脂がシアネート基を有する化合物を含む樹脂組成物の半硬化物であり、
前記樹脂におけるトリアジン環の含有量が0.6~4.0質量%である、複合シート。 - 厚みが2mm未満である多孔質のセラミックス焼結体と、
前記セラミックス焼結体の気孔に充填されている樹脂と、を含み、
前記樹脂がシアネート基を有する化合物を含む樹脂組成物の半硬化物であり、
前記樹脂に対する赤外吸収強度をATR法で測定したときの、トリアジン環に対応する1533~1565cm-1におけるピーク強度を1498~1526cm-1におけるピーク強度で除した値が0.200~0.800である、複合シート。 - 前記樹脂の充填率が85体積%以上である、請求項1又は2に記載の複合シート。
- 請求項1~3のいずれか一項に記載の複合シートと金属シートとが積層されている、積層体。
- 厚みが2mm未満である多孔質のセラミックス焼結体と、前記セラミックス焼結体の気孔に充填されている樹脂と、を含む複合シートの接着性を推定する評価方法であって、
前記樹脂の赤外吸収強度をATR法によって測定する工程、及び
前記赤外吸収強度の値を用いて前記複合シートの接着性を推定する工程、を含む、評価方法。
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