摘要
将静态超高压高温合成的人造金刚石晶粒利用RTO包埋法制备成适合TEM观察的样品,发现这些金刚石晶粒是由多根细长的纳米多晶棒沿一定取向规则地以捆束状堆叠、聚集而成,而这些纳米多晶棒之间填充了无定型碳。也就是说,人造金刚石晶粒是由结晶碳素和无定型碳组成的。由此,提出并绘制了人造金刚石晶粒的微观结构模型示意图,可用于解释人造金刚石的各向异性及其他宏观性能特征。在以上结论的基础上,笔者认为业界经常提及的"单晶"金刚石称谓可能并不严谨,可能并不是纯粹由结晶金刚石材料组成。
Synthetic diamond grains, produced under the static high pressure and high temperature(HPHT) conditions, were prepared into nanofilm for TEM observation by RTO method. It is found originally that diamond grain is actually consisting of many tiny rod-like nanodiamonds through an orientated piling or aggregation, and the amorphous carbon was filled in the area between these nanodiamonds. It meant that a synthetic diamond grain was constructed by bundles of nanodiamonds and amorphous carbon, and this originally finding inspired us to propose and draw a completely novel microstructure model for synthetic diamond grain, which could help us to better understand the anisotropy and other macroscopic properties of diamond grains. Based on this finding, it was further inferred that the traditional concept of monocrystal of diamond called in the superhard industry may not be rigorous or correct because it was probably not consisting of pure crystalline diamond.
作者
黄海芳
黄凯
谷继腾
方克明
HUANG Haifang;HUANG Kai;GU Jiteng;FANG Keming(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Department of Chemistry,National University of Singapore,Kent Ridge 119077,Singapore)
出处
《人工晶体学报》
EI
CAS
北大核心
2020年第7期1180-1186,共7页
Journal of Synthetic Crystals
关键词
人造金刚石
微观结构
捆束状
各向异性
高压高温
RTO包埋法
synthetic diamond
microstructure
bundle-like
anisotropy
high pressure and high temperature(HPHT)
RTO method
