Nanolayered Diamond Sintered Compact Obtained by Direct Conversion from Highly Oriented Graphite under High Pressure and High Temperature
Nanolayered Diamond Sintered Compact Obtained by Direct Conversion from Highly Oriented Graphite under High Pressure and High Temperature
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DOI：
10.1155/2013/380165
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发表时间：
2013-01-01
影响因子：
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通讯作者：
Irifune, Tetsuo
中科院分区：
文献类型：
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作者：
Isobe, Futoshi;Ohfuji, Hiroaki;Irifune, Tetsuo
一种新型的多晶烧结金刚石已通过在15吉帕和2300摄氏度下由高定向热解石墨直接转化成功合成。它是光学透明的，完全由立方金刚石的层状纳米晶体（50 - 100纳米厚）组成，这些纳米晶体彼此紧密结合，并且沿堆叠方向具有强烈的[111]择优取向。这种纳米层状金刚石具有优异的压痕硬度（努氏硬度约为114吉帕），可与从单晶金刚石获得的最高值相媲美。此外，由于圆柱烧结体两端的表面完全由层状金刚石纳米晶体最硬的{111}面终止，预计其在两端具有极高的耐磨性。
A new type of polycrystalline sintered diamond has been successfully synthesized by direct conversion from highly oriented pyrolytic graphite at 15GPa and 2300 degrees C. It is optically transparent and consists entirely of layered nanocrystals (50-100nm thick) of cubic diamond, which are tightly bound to each other and have strong [111] preferred orientation along the stacking direction. This nanolayered diamond has excellent indentation hardness (similar to 114GPa in Knoop scale) comparable to the highest values obtained from single crystalline diamond. Furthermore, it is expected to have significantly high wear resistance on both ends of cylindrical sintered compact, since the surfaces are terminated exclusively by the hardest {111} planes of the layered diamond nanocrystals.