金刚石微粉强度测试方法

Strength Test Approach of Diamond Micropowder

近几十年来,我国在人造金刚石单晶和金刚石微粉的研发和生产上进展迅速,已经成为世界人造金刚石单晶和金刚石微粉生产大国,世界50%以上的人造金刚石制品来自于中国。目前金刚石单晶的评价手段较为完善,不管是单晶强度、杂质含量、粒径还是形貌等均具有成熟通用的表征方法。现在市场上多以中南钻石的金刚石单晶为参照标准,根据其强度将金刚石单晶分为1~9型。但是金刚石单晶破碎料即金刚石微粉的评价手段仍有所欠缺,尤其是金刚石微粉的强度测试方法至今仍没有市场普遍认可的表征方法。如今,金刚石微粉的强度测试方法有拉曼光谱法、红外光谱法、冲击韧性法和冷压破碎法等。文章研究对比了几种测试方法的特点,并重点介绍了拉曼光谱法测试微粉强度的案例。

In recent decades,China has made rapid progress in the research and production of single crystal diamond and diamond micropowder,and has become the world's largest producer of single crystal diamond and diamond micropowder.More than 50%of the world's synthetic diamond products come from China.Currently the single crystal diamond from ZhongNan Diamond Co.,LTD is used as reference standard in the market,and is divided into 1~9 types according to its strength.At present,there are mature and universal characterization methods for single crystal strength,impurity content,particle size and morphology.The evaluation methods of single crystal diamond are relatively all-sided.However,there is a short of evaluation methods for single crystal diamond crushed micropowder,especially the strength test method of diamond powder is still not the characterization method generally recognized by the market.Nowadays,the strength test methods of diamond micropowder include Raman spectroscopy,infrared spectroscopy,impact toughness method and cold press crushing method.In this paper,the characteristics of four testing methods are studied and compared,and the Raman spectroscopy testing and analyzing method is introduced in detail.