JP7165844B2 - 複合シート及びその製造方法、並びに、積層体及びその製造方法 - Google Patents
複合シート及びその製造方法、並びに、積層体及びその製造方法 Download PDFInfo
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- JP7165844B2 JP7165844B2 JP2022549211A JP2022549211A JP7165844B2 JP 7165844 B2 JP7165844 B2 JP 7165844B2 JP 2022549211 A JP2022549211 A JP 2022549211A JP 2022549211 A JP2022549211 A JP 2022549211A JP 7165844 B2 JP7165844 B2 JP 7165844B2
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Description
気孔率(体積%)=[1-(B/A)]×100 (1)
<窒化物焼結体の作製>
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の体積及び質量を測定し、当該体積及び質量からかさ密度B(kg/m3)を算出した。このかさ密度Bと窒化ホウ素の理論密度(2280kg/m3)とから、以下の計算式(2)によって気孔率を求めた。結果を表1に示す。
気孔率(体積%)=[1-(B/2280)]×100 (2)
市販のエポキシ樹脂(三菱ケミカル株式会社製、商品名:エピコート807)100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-8)を10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15分間加熱した後、その温度を維持したままスポイトを用いて、120℃に加熱された窒化ホウ素焼結体の上側の主面上に滴下して樹脂組成物を含浸した。樹脂組成物の滴下量は、窒化ホウ素焼結体の気孔の総体積の1.3倍とした。樹脂組成物の一部は、窒化ホウ素焼結体に含浸せず、主面上に残存した。
硬化率(%)={1-[(R/c)×100]/Q}×100・・・(3)
ステンレス製のスクレーパーで平滑にした主面における最大高さ粗さRz及び算術平均粗さRaを測定した。Rz及びRzはISO 25178に準拠して測定される面粗さである。測定には、株式会社キーエンス製のダブルスキャン高精度レーザ測定器LT-9000(商品名)、及び、同社製の高精度形状測定システムKS-1100(商品名)を用いた。複合シートの主面の全体に亘ってレーザを500μm/sで走査し、1μmピッチで高さを測定して最大高さ粗さRz及び算術平均粗さRaを求めた。結果は表1に示すとおりであった。
複合シートに含まれる樹脂の充填率を、以下の式(4)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×0.5mm)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。
ASTM-D5470に準拠して、積層方向における積層体の熱抵抗を測定した。測定には、樹脂材料熱抵抗測定装置(株式会社日立テクノロジーアンドサービス製)を使用した。比較例1で得られた複合シートを用いて調製される積層体の熱抵抗(単位:K/W)を基準として、実施例1で得られた複合シートを用いて調製される積層体の熱抵抗を以下のとおり相対値で評価した。結果は表1に示すとおりであった。
A:比較例1の熱抵抗を1としたときの相対値が0.8未満
B:比較例1の熱抵抗を1としたときの相対値が0.8以上1未満
C:比較例1の熱抵抗を1としたときの相対値が1以上
スクレーパーの代わりに100℃の熱風を用いたこと以外は実施例1と同様にして複合シートを作製した。すなわち、窒化ホウ素焼結体の上側の主面上の樹脂組成物に対し、ブロアーを用いて100℃の熱風(空気)を吹き付けて主面上の樹脂組成物を平滑化した。余剰の樹脂組成物を吹き飛ばし、主面が平滑である樹脂含浸体を調製した。実施例1と同様に、複合シートの各測定、積層体の作製及び評価を行った。結果は表1に示すとおりであった。
スクレーパーの代わりにサンドペーパー(JIS R6010(2000)で規定される粒度:P2000)を用いたこと以外は実施例1と同様にして複合シートを作製した。すなわち、窒化ホウ素焼結体の上側の主面上の樹脂組成物に対し、上記サンドペーパーを用いて窒化物焼結体の主面上の樹脂組成物を平滑化し、主面が平滑である樹脂含浸体を調製した。実施例1と同様に、複合シートの各測定、積層体の作製及び評価を行った。結果は表1に示すとおりであった。
スクレーパーの代わりに紙ワイパー(日本製紙クレシア株式会社製)を用いたこと以外は実施例1と同様にして複合シートを作製した。すなわち、窒化ホウ素焼結体の上側の主面上の樹脂組成物を、紙ワイパーを用いて拭き取って平滑化した。余剰の樹脂組成物を除去し、主面が平滑である樹脂含浸体を調製した。実施例1と同様に、複合シートの各測定、積層体の作製及び評価を行った。結果は表1に示すとおりであった。
スクレーパーの代わりに約100℃の熱水を用いたこと以外は実施例1と同様にして複合シートを作製した。すなわち、窒化ホウ素焼結体の上側の主面上に樹脂組成物を塗布した後、熱水中に5分間浸漬した。これによって、主面上にある余剰の樹脂組成物を洗い流し、主面が平滑である樹脂含浸体を調製した。熱水中から取り出した樹脂含浸体を用いて、実施例1と同様に、複合シートの各測定、積層体の作製及び評価を行った。結果は表1に示すとおりであった。
スクレーパーの代わりに約20℃の溶剤(アセトン)を用いたこと以外は実施例1と同様にして複合シートを作製した。すなわち、窒化ホウ素焼結体の上側の主面上に樹脂組成物を塗布した後、約20℃の溶剤中に5分間浸漬した。これによって、主面上にある余剰の樹脂組成物を洗い流し、主面が平滑である樹脂含浸体を調製した。溶剤中から取り出した樹脂含浸体を用いて、実施例1と同様に、複合シートの各測定、積層体の作製及び評価を行った。結果は表1に示すとおりであった。
実施例1と同じ手順で、炭窒化ホウ素(B4CN4)を含む焼成物と焼結助剤とを調製し、これらを配合して粉末状の配合物を調製した。この配合物を、粉末プレス機を用いて、150MPaで30秒間加圧して、ブロック状(縦×横×厚さ=50mm×50mm×48mm)の成形体を得た。この成形体を窒化ホウ素製容器に入れ、バッチ式高周波炉に導入した。バッチ式高周波炉において、常圧、窒素流量5L/分、2000℃の条件で5時間加熱した。その後、窒化ホウ素製容器から窒化ホウ素焼結体を取り出した。このようにして、ブロック状(四角柱状)の窒化ホウ素焼結体を得た。窒化ホウ素焼結体のサイズは、縦×横×厚さ=50mm×50mm×50mmであった。得られた窒化ホウ素焼結体の気孔率を実施例1と同じ手順で測定した。結果を表1に示す。
Claims (9)
- 厚みが2mm未満である多孔質の窒化物焼結体と、
前記窒化物焼結体の気孔に充填されている樹脂と、を含み、
最大高さ粗さRzが20μm未満である主面を有する、複合シート。 - 前記気孔における前記樹脂の充填率が85体積%以上である、請求項1に記載の複合シート。
- 前記窒化物焼結体が窒化ホウ素焼結体を含む、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窒化物焼結体の気孔に樹脂組成物を含浸する含浸工程と、
前記窒化物焼結体の主面に付着する前記樹脂組成物を平滑化して、前記主面の一部が露出した樹脂含浸体を得る平滑化工程と、
前記樹脂含浸体を加熱して前記気孔に含浸した前記樹脂組成物を硬化又は半硬化して、最大高さ粗さRzが20μm未満である主面を有する複合シートを得る硬化工程と、を有する、複合シートの製造方法。 - 前記平滑化工程では、均し部材、研磨部材、研磨装置、熱水、前記樹脂組成物と相溶する溶剤、及び、熱風からなる群より選ばれる少なくとも一つを用いて、前記窒化物焼結体の前記主面に付着する前記樹脂組成物を平滑化する、請求項5に記載の複合シートの製造方法。
- 前記硬化工程で得られる前記複合シートの樹脂の充填率が85体積%以上である、請求項5又は6に記載の複合シートの製造方法。
- 前記窒化物焼結体が窒化ホウ素焼結体を含む、請求項5~7のいずれか一項に記載の複合シートの製造方法。
- 請求項5~8のいずれか一項に記載の製造方法で得られた前記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。
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