JP2017074598A - 銅粒子を用いた低温接合方法 - Google Patents
銅粒子を用いた低温接合方法 Download PDFInfo
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- JP2017074598A JP2017074598A JP2015202741A JP2015202741A JP2017074598A JP 2017074598 A JP2017074598 A JP 2017074598A JP 2015202741 A JP2015202741 A JP 2015202741A JP 2015202741 A JP2015202741 A JP 2015202741A JP 2017074598 A JP2017074598 A JP 2017074598A
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- copper
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- copper particles
- low
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Abstract
Description
銅粒子を用いた接合方法であって、
前記銅粒子の平均粒径が1〜50μmであり、
前記銅粒子を酸化させて表面酸化銅粒子を得る第一工程と、
2つの被接合部材の間に前記表面酸化銅粒子を介在させた後、還元雰囲気下で加熱する第二工程と、を含むこと、
を特徴とする低温接合方法を提供する。
銅粒子の表面の少なくとも一部が酸化銅粒子で被覆されており、
前記銅粒子の平均粒径が1〜50μmであり、
前記酸化銅粒子の平均粒径が1〜300nmであること、
を特徴とする低温接合用銅粒子も提供する。
図1は、本発明の低温接合方法の工程図である。本発明の低温接合方法は、銅粒子の酸化及び還元を利用して接合を達成する方法であり、銅粒子を酸化させる第一工程(S01)と、表面酸化銅粒子を還元すると共に接合を行う第二工程(S02)と、を含むものである。
第一工程(S01)は、平均粒径が1〜50μmの銅粒子(マイクロ銅粒子)に酸化処理を施すことで、表面酸化銅粒子を得る工程である。マイクロ銅粒子に対して酸化処理を施すことで、表面に酸化銅ナノ粒子を形成することができる。
第二工程(S02)は、第一工程(S01)で得られた表面酸化銅粒子を還元して銅ナノ粒子で被覆されたマイクロ銅粒子を生成すると共に接合を行う工程である。
図2は、本発明の低温接合用銅粒子の概略断面図である。本発明の低温接合用銅粒子2は、銅粒子4の表面が酸化銅粒子6で被覆されていること、を特徴としている。低温接合用銅粒子2を被接合界面に配置し、適当な還元雰囲気下で保持することで接合を達成することができる。なお、酸化銅粒子6は銅粒子4の表面に担持されていることから低温接合用銅粒子2の取り扱いが容易であり、被接合界面において銅粒子4と酸化銅粒子6とを均一に分散(配置)することができる。換言すると、金属ナノ粒子を用いた従来の接合用組成物で問題となっている金属ナノ粒子等の凝集及び偏在を解消することができる。
図3に示す平均粒径8μmの扁平状の銅粒子(三井金属鉱業株式会社製のフレーク状銅粉:1400YP)を300℃の大気中に20分間保持し、表面酸化銅粒子を得た(第一工程(S01))。当該表面酸化銅粒子のSEM写真を図4及び図5に示す。なお、図5は図4において破線で囲まれた領域の高倍率写真である。酸化処理によって、銅粒子の表面に平均粒径が約200nmの粒子が生成していることが分かる。SEM観察には株式会社日立ハイテクノロジーズの超高分解能分析走査電子顕微鏡SU−70を用いた。
図3に示す銅粒子を130℃の大気中で5分間保持して酸化処理を施した後、300℃のギ酸雰囲気下で60分間保持して還元処理を施した。酸化処理後及び還元処理後の銅粒子のSEM写真を図14及び図15にそれぞれ示す。酸化処理後及び還元処理後の銅粒子の表面は平滑な状況となっており、酸化銅粒子及び銅ナノ粒子の生成は認められない。
4・・・銅粒子、
6・・・酸化銅粒子。
Claims (7)
- 銅粒子を用いた接合方法であって、
前記銅粒子の平均粒径が1〜50μmであり、
前記銅粒子を酸化させて表面酸化銅粒子を得る第一工程と、
2つの被接合部材の間に前記表面酸化銅粒子を介在させた後、還元雰囲気下で加熱する第二工程と、を含むこと、
を特徴とする低温接合方法。 - 前記第二工程において、還元雰囲気をギ酸雰囲気とすること、
を特徴とする請求項1に記載の低温接合方法。 - 前記第二工程において、前記表面酸化銅粒子を150〜350℃で1〜60分間保持すること、
を特徴とする請求項1又は2に記載の低温接合方法。 - 前記第二工程を自重圧下で行うこと、
を特徴とする請求項1〜3のうちのいずれかに記載の低温接合方法。 - 前記第一工程において、前記銅粒子を200〜400℃の大気中に1〜60分間保持すること、
を特徴とする請求項1〜4のうちのいずれかに記載の低温接合方法。 - 銅粒子の表面の少なくとも一部が酸化銅粒子で被覆されており、
前記銅粒子の平均粒径が1〜50μmであり、
前記酸化銅粒子の平均粒径が1〜300nmであること、
を特徴とする低温接合用銅粒子。 - 前記銅粒子が扁平状であること、
を特徴とする請求項6に記載の低温接合用銅粒子。
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CN111295741A (zh) * | 2017-11-08 | 2020-06-16 | 日立化成株式会社 | 接合体的制造方法及接合材料 |
CN111375774A (zh) * | 2020-04-29 | 2020-07-07 | 西安稀有金属材料研究院有限公司 | 一种电子封装用石墨-铜钼基复合材料的制备方法 |
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