Synthesis of Nanocrystalline Diamond Ceramics. II. Dynamic Method: Control of Nucleation and Growth for an Extremely Short Period.

  • KONDO Ken-ichi
    Materials and Structures Laboratory, Tokyo Institute of Technology

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  • 次世代超硬質材料の超高圧合成とナノ組織制御  ナノダイヤモンドセラミックス合成 II  動的合成法  極短時間の核生成・粒成長の制御
  • ナノダイヤモンドセラミックス合成(2)動的合成法:極短時間の核生成・粒成長の制御
  • ナノダイヤモンド セラミックス ゴウセイ 2 ドウテキ ゴウセイホウ ゴクタン ジカン ノ カク セイセイ リュウ セイチョウ ノ セイギョ

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Abstract

Shock compaction methods for diamond powder can produce nanocrystalline diamond ceramics consisting of particles a few tens of nanometers in diameter. However, by using these methods, it is difficult to consolidate nanocrystalline diamond powder of only a few nanometers in diameter because heat localization, which is essentially important for the shock compaction process, can not be achieved. On the other hand, the SCARQ (shock compression and rapid quenching) method can produce transparent, nanocrystalline and/or amorphous diamond films 5-μm thick by controlling the nucleation and growth process in the phase transition from fullerene to diamond. The stability of the diamond phase dependent on their size is also discussed.

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