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一、引言 众所周知,天然金刚石中有一种大颗粒多晶体金刚石(俗称黑金刚石)。它比单晶体金刚石更适于钻进非均质、颗粒粗、摩擦性大的中硬岩石。这种金刚石是由微细金刚石和微量杂质所组成,其特点是脆性低、韧性好。但是这种金刚石的产量稀少,且性能受自然条件影响质量有较大的变化,所以没有得到应有的广泛使用。因此,探索这种金刚石形成的条件及其有关机制问题,受到国内外有关单位的重视。我们采用磨料级人造金刚石作原料,先经净化处理,在77千巴左右利用外加镍管扩散镍的方法,烧结出大颗粒多晶体金刚石,并结合一些实验现象,进行了一些探讨。
I. Introduction As we all know, there is a natural diamond in large polycrystalline diamond (commonly known as black diamond). It is more suitable than single-crystal diamond drilling into non-homogeneous, coarse particles, friction in the hard rock. This diamond is composed of fine diamonds and trace impurities, characterized by low brittleness and good toughness. However, the production of such diamonds is scarce, and the performance of natural conditions have greatly affected the quality of change, it did not get the due widespread use. Therefore, to explore the diamond formation conditions and related mechanisms, by the relevant units at home and abroad attention. We use abrasive grade synthetic diamond as the raw material, after the purification treatment, the use of nickel plus nickel tube diffusion method at about 77 kilobatts, sintering of large-particle polycrystalline diamond, combined with some experimental phenomena, some discussions.