JP2019052071A - 絶縁性熱伝導体 - Google Patents
絶縁性熱伝導体 Download PDFInfo
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Abstract
Description
窒化珪素(Si3N4)粉末と、焼結助剤として平均粒径0.7μmのY2O3粉末と、焼結助剤としてMgO粉末と、を質量比で100:7:3の割合で秤量し、それらに対して10質量%となるように平均粒径0.8μmの炭化珪素(SiC)粉末を加え、エタノール中で窒化珪素ボールを用いて100時間湿式混合して混合粉末を作製した。得られた混合粉末に所定量の溶媒、分散剤、バインダを加えスラリーを調整し、テープ成形機を用いて厚さ約2.5mmの第1のシート成形体を形成した。
実施例1で得られた焼結体に対し、板材両面の表面部をさらに135μm研削して第2、第3の領域の厚さが15μmとなるように加工した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
実施例1と同じ方法にてSiCを加えないSi3N4材で構成した絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
表1に示すように、第2、第3の領域の厚さが7μmとなるように加工した以外は実施例1と同様の条件で絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
表1に示すように、実施例1のSiC粒子の添加量を25質量%に変更したこと以外は実際例1と同様の条件で絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
(比較例3)
表1に示すように、実施例1のSiC粒子の代わりにCNFを0.25質量%添加したこと以外は実施例1と同様の条件で絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
表1に示すように、実施例1のSiC粒子の代わりにCNFを1.5質量%添加したこと以外は実施例1と同様の条件で絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
表1に示すように、実施例1のSiC粒子の代わりにCNFを0.15質量%添加したこと以外は実施例1と同様の条件で絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
表1に示すように、実施例1のSiC粒子の代わりにCNFを3質量%添加したこと以外は実施例1と同様の条件で絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
実施例1の焼結助剤に平均粒径1.0μmのイッテリビウム(Yb2O3)粉末と酸化マグネシウム(MgO)粉末を用いた以外は実施例1と同じ量、同じ方法で第2のシート成形体を作製した。同様に、焼結助剤をY2O3粉末とMgO粉末として、実施例1と同様にSiC粉末を加え、第1のシート成形体を作製した。これらのシート成形体を、実施例1と同じ方法で積層、焼結して焼結体を得た。得られた焼結体の両面表面部を100μm研削して、厚さ50μmの第2、第3の領域を有する絶縁性熱伝導体を作製した。さらに熱伝導率および体積抵抗率を測定した。結果を表1に示す。
Claims (7)
- 窒化珪素部材からなり、
前記窒化珪素部材の第1の表面から垂直な断面において深さ方向に10μm以上離れて設けられ、炭化珪素および炭素材料からなる群より選ばれる少なくとも一つの物質と、を含む第1の領域と、
前記第1の表面と前記第1の領域との間に設けられた第2の領域と、を具備し、
前記第2の領域の窒化珪素の濃度は、前記第1の領域の前記窒化珪素の濃度よりも高い、絶縁性熱伝導体。 - 前記第2の領域の体積抵抗率は、1014Ω・cm以上である、請求項1に記載の絶縁性熱伝導体。
- 前記第1の領域および前記第2の領域の少なくとも一つは、Mg、Ca、Sr、Ba、Y、La、Ce、Pr、Nd、Sm、Eu、Gd、Dy、Er、及びYbからなる群より選ばれる少なくとも一つの元素を0.5質量%以上10質量%以下含む、請求項1または請求項2に記載の絶縁性熱伝導体。
- 前記第1の領域は、Mg、Ca、Sr、Ba、Y、La、Ce、Pr、Nd、Sm、Eu、Gd、Dy、Er、及びYbからなる群より選ばれる少なくとも一つの第1の元素を0.5質量%以上10質量%以下含み、
前記第2の領域は、Mg、Ca、Sr、Ba、Y、La、Ce、Pr、Nd、Sm、Eu、Gd、Dy、Er、及びYbからなる群より選ばれ且つ前記第1の元素と異なる少なくとも一つの第2の元素を0.5質量%以上10質量%以下含む、請求項1または請求項2に記載の絶縁性熱伝導体。 - 前記第1の領域の前記物質の濃度は、0.2質量%以上30質量%以下である、請求項1ないし請求項4のいずれか一項に記載の絶縁性熱伝導体。
- 前記窒化珪素部材は、
前記第1の表面に対向する第2の表面と、
前記第2の表面と前記第1の領域との間に設けられた第3の領域と、を具備し、
前記第1の領域は、前記第2の表面から垂直な断面において深さ方向に10μm以上離れて設けられ、
前記第3の領域の窒化珪素の濃度は、前記第1の領域の前記窒化珪素の濃度よりも高い、請求項1ないし請求項5のいずれか一項に記載の絶縁性熱伝導体。 - 前記絶縁性熱伝導体の熱伝導率は、100W/m・K以上である、請求項1ないし請求項6のいずれか一項に記載の絶縁性熱伝導体。
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