Synthesis of pure sintered body of hexagonal diamond and its characterization

六方金刚石纯烧结体的合成及其表征

• 批准号: 23760640
• 负责人: OHFUJI Hiroaki
• 金额: $ 2.75万
• 依托单位: Ehime University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011 至 2013
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23760640/
• 关键词: 六方晶ダイヤモンド; 高圧実験; 高温高圧; 直接変換; 高温高圧実験; 物性測定; 電子顕微鏡観察

We performed a series of high pressure and high temperature experiments using a large-volume press to synthesize a pure, single-phase hexagonal diamond sintered body. Our study demonstrated that single-phase hexagonal diamond, which includes neither traces of unreacted graphite starting material nor cubic diamond, can be obtained at 25 GPa and 1100-1500C through direct conversion of highly-oriented, highly-crystalline graphite. The sample consists of extremely thin layered units (a few to several tens of nm) and is as dense as cubic diamond. Since our preliminary hardness measurements provided very high indentation hardness values comparable to or exceeding that of cubic diamond, this nano-sintered body of pure hexagonal diamond would have potential application as a novel ultra-hard material.

我们使用大体积压机进行了一系列高压和高温实验，合成了纯净的单相六方金刚石烧结体。我们的研究表明，通过直接转化高取向、高结晶石墨，可以在 25 GPa 和 1100-1500C 下获得单相六方金刚石，其中既不含未反应的石墨原料，也不含立方金刚石。该样品由极薄的层状单元（几纳米到几十纳米）组成，密度与立方金刚石一样。由于我们的初步硬度测量提供了非常高的压痕硬度值，可与立方金刚石相当或超过立方金刚石，因此这种纯六方金刚石纳米烧结体将具有作为新型超硬材料的潜在应用。

项目成果

Nano-layered diamond sintered compact obtained by direct conversion from highly oriented graphite under high pressure and high temperature.

高取向石墨在高压高温下直接转化而成的纳米层状金刚石烧结体。

• DOI: 10.1155/2013/380165
• 发表时间: 2013
• 作者: F. Isobe; H. Ohfuji; H. Sumiya; T. Irifune
• 通讯作者: T. Irifune

六方晶ダイヤモンド単相バルク焼結体およびその製造方法

六方金刚石单相块体烧结体及其制造方法

• 发表时间: 2013

Influence of graphite crystallinity on the microtexture of nano-polycrystalline diamond obtained by direct conversion.

石墨结晶度对直接转化纳米多晶金刚石微观结构的影响

• DOI: 10.1007/s00269-012-0510-3
• 发表时间: 2012
• 作者: H. Ohfuji; S. Okimoto; T. Kunimoto; F. Isobe; H. Sumiya; K. Komatsu; T. Irifune
• 通讯作者: T. Irifune

Wear resistance of nano-polycrystalline diamond with various hexagonal diamond contents

不同六方金刚石含量纳米聚晶金刚石的耐磨性

• DOI: 10.3103/s1063457612060081
• 发表时间: 2012
• 影响因子: 0.9
• 作者: A. Kurio; Y. Tanaka; H. Sumiya; T. Irifune; T. Shinmei; H. Ohfuji; H. Kagi
• 通讯作者: H. Kagi

六方晶ダイヤモンドの単相バルク焼結体の製造方法

六方金刚石单相块体烧结体的制造方法

• 发表时间: 2012