Structural features of "Carbonado" diamond polycrystalline composite materials

被引：0
|
作者：
Laptev, A. I. [1 ]
Nozhkina, A. V. [2 ]
Zaitsev, A. K. [1 ]
Ermolaev, A. A. [1 ]
机构：
[1] Natl Univ Sci & Technol MISiS, Moscow 119049, Russia
[2] All Russian Res Inst Nat & Artificial Diamonds &, Moscow 107996, Russia
来源：
RUSSIAN JOURNAL OF NON-FERROUS METALS | 2012年 / 53卷 / 06期
关键词：
PCD; synthesis; high pressures; HTHP; martensite transformation; carbonado; crystallites; CSR size;
D O I：
10.3103/S1067821212060041
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
A thermodynamic analysis of the graphite -> diamond transformation during the synthesis of diamond polycrystals is performed. It is established that the critical nucleus size decreases as the pressure increases, being 2.3 nm for p = 12 GPa. It is established when studying the crystal structure of diamond polycrystals that their block size (coherent scattering region (CSR)) is independent of the synthesis pressure and exceeds the block size of the starting graphite. It is shown that the features for martensite transformation in metals and alloys are unobservable during the synthesis of diamond polycrystals.
引用
收藏
页码：471 / 475
页数：5
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