一、引言自然界中存在少量的如巴拉斯、黑金刚石之类的多晶金刚石团块。鉴于它们有独特的机械性质,试图理解这类金刚石的形成机制并在实验室中进行合成,便成为人们十分感兴趣的问题。我们用金属触媒方法进行了这类金刚石合成的尝试,观察团块形成的条件与特征、触媒在试样中的运动以及与所形成团块的性能的关系。 I. INTRODUCTION There is a small amount of polycrystalline diamond agglomerates in nature, such as Varassas, black diamonds and the like. Given their unique mechanical properties, attempts to understand the formation mechanism of such diamonds and to synthesize them in the lab have become of major interest. We tried this kind of diamond synthesis with a metal catalyst method, observing the conditions and characteristics of the formation of clumps, the movement of the catalyst in the specimen, and the relationship with the properties of the formed clumps.