JP7196367B2 - 複合シート及びその製造方法、積層体及びその製造方法、並びに、パワーデバイス - Google Patents
複合シート及びその製造方法、積層体及びその製造方法、並びに、パワーデバイス Download PDFInfo
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- JP7196367B2 JP7196367B2 JP2022542719A JP2022542719A JP7196367B2 JP 7196367 B2 JP7196367 B2 JP 7196367B2 JP 2022542719 A JP2022542719 A JP 2022542719A JP 2022542719 A JP2022542719 A JP 2022542719A JP 7196367 B2 JP7196367 B2 JP 7196367B2
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Description
含浸されている樹脂組成物の硬化率(%)={1-[(R/c)×100]/Q}×100・・・(A)
気孔率(体積%)=[1-(B/A)]×100 (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11時間加熱し、硬化率を64%に調整した。硬化率13%の樹脂組成物を、その温度を維持したまま、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シリコンゴム製のヘラを用いて塗り伸ばし、主面全体に樹脂組成物を塗り広げて樹脂組成物含浸体を得た。
含浸されている樹脂組成物の硬化率(%)={1-[(R/c)×100]/Q}×100・・・(A)
複合シートに含まれる樹脂の充填率を、以下の式(3)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。
上述の処理を施したのち、ASTM D5470に記載の方法に準拠して、接触熱抵抗を測定した。測定結果から、以下の基準で接触熱抵抗を評価した。
A:接触熱抵抗が0.45K/W以下である。
B:接触熱抵抗が0.45K/W超0.65K/W以下である。
C:接触熱抵抗が0.65K/W超である。
上述の処理を施したのち、ASTM D5470に記載の方法に準拠して、熱抵抗を測定した。測定結果から、以下の基準で熱抵抗を評価した。
A:熱抵抗が0.6K/W以下である。
B:熱抵抗が0.6K/W超0.8K/W以下である。
C:熱抵抗が0.8K/W超である。
樹脂組成物含浸体における樹脂組成物を半硬化させる際の条件を、70℃、300分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こと、及び、窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を63%としたこと以外は、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こと、及び、窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を30%としたこと以外は、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。
窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を6%としたこと以外は、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こと、及び、窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を25%としたこと以外は、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こと、及び、窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を64%としたこと以外は、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。
窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を2%としたこと以外は、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。
窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を81%としたこと以外は、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こと、及び、窒化ホウ素焼結体の主面に滴下する樹脂組成物の硬化率を22%としたこと以外は、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。
Claims (12)
- 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、
前記樹脂の硬化率が10~70%であり、
前記セラミックス焼結体が切断面を有しない、複合シート。 - 前記樹脂の充填率が85~100体積%である、請求項1に記載の複合シート。
- 前記セラミックス焼結体が有する前記気孔の平均細孔径が0.2~10μmである、請求項1又は2に記載の複合シート。
- 前記セラミックス焼結体が窒化物焼結体である、請求項1~3のいずれか一項に記載の複合シート。
- 請求項1~4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の気孔に樹脂組成物を含浸して樹脂組成物含浸体を得る含浸工程と、
前記樹脂組成物含浸体を70~160℃で加熱して前記気孔に充填された前記樹脂組成物を半硬化する硬化工程と、を有し、
前記含浸工程における前記樹脂組成物の硬化率が5~65%である、複合シートの製造方法。 - 前記硬化工程は、前記気孔に充填された前記樹脂組成物の硬化率が10~70%となるように半硬化する工程である、請求項6に記載の複合シートの製造方法。
- 前記樹脂の充填率が85~100体積%である、請求項6又は7に記載の複合シートの製造方法。
- 前記セラミックス焼結体が有する前記気孔の平均細孔径が0.2~10μmである、請求項6~8のいずれか一項に記載の複合シートの製造方法。
- 前記セラミックス焼結体が窒化物焼結体である、請求項6~9のいずれか一項に記載の複合シートの製造方法。
- 請求項6~10のいずれか一項に記載の製造方法で得られた複合シートと金属シートとを積層し、加熱及び加圧する積層工程を有する、積層体の製造方法。
- 請求項1~4のいずれか一項に記載の複合シートと、前記複合シートに積層された金属シートと、を有する積層体を備える、パワーデバイス。
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JP2001240476A (ja) | 2000-02-28 | 2001-09-04 | Tdk Corp | ホットプレス方法およびセラミックス素子の製造方法 |
WO2014196496A1 (ja) | 2013-06-03 | 2014-12-11 | 電気化学工業株式会社 | 樹脂含浸窒化ホウ素焼結体およびその用途 |
WO2017155110A1 (ja) | 2016-03-10 | 2017-09-14 | デンカ株式会社 | セラミックス樹脂複合体 |
WO2019111978A1 (ja) | 2017-12-05 | 2019-06-13 | デンカ株式会社 | 窒化物系セラミックス樹脂複合体 |
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JP2001240476A (ja) | 2000-02-28 | 2001-09-04 | Tdk Corp | ホットプレス方法およびセラミックス素子の製造方法 |
WO2014196496A1 (ja) | 2013-06-03 | 2014-12-11 | 電気化学工業株式会社 | 樹脂含浸窒化ホウ素焼結体およびその用途 |
WO2017155110A1 (ja) | 2016-03-10 | 2017-09-14 | デンカ株式会社 | セラミックス樹脂複合体 |
WO2019111978A1 (ja) | 2017-12-05 | 2019-06-13 | デンカ株式会社 | 窒化物系セラミックス樹脂複合体 |
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