粘性金属对合成高品级金刚石的影响  

Effect of viscous metals on the synthesis of high grade diamond

作　　者：薛胜辉 XUE Shenghui(Zhengzhou Sino Crystal Co.,Ltd.,Zhengzhou 450001,China)

机构地区：[1]郑州华晶金刚石股份有限公司,河南郑州450001

出　　处：《超硬材料工程》2022年第3期31-34,共4页Superhard Material Engineering

摘　　要：根据触媒材料的选择原则,在金属触媒中加入了合适比例的钼等粘性金属,在高温高压下合成出了晶形完整、晶体内部几乎没有杂质的高品级金刚石,并对金刚石的晶体缺陷和内部杂质的形成进行了研究。研究结果表明,粘性金属钼由于原子间结合力极强,金刚石在长大的过程中,使金属薄膜表面积的扩大得到了提高,并长时间大于金刚石晶体长大的速度,所以金属薄膜难以破裂,颗粒表面不会形成凹坑缺陷。在碳源供应的过程中,钼作为强的碳结合元素,容易消耗掉一部分碳原子,使碳原子的扩散变的困难,金刚石颗粒在长大时,能降低金刚石的长大速度,从而降低了晶体内部的气泡和杂质,提高了金刚石的品级。In this paper,according to the selection principle of catalyst materials,high-grade diamond with complete crystal shape and almost no impurities in the crystal is synthesized by adding appropriate proportion of molybdenum and other viscous metals to the metal catalyst at high temperature and high pressure.And,the crystal defects and the formation of internal impurities of diamond are studied.The result shows that due to the strong bonding force between atoms of viscous molybdenum,the surface area of metal film is enlarged during the growth of diamond,which is longer than the growth rate of diamond crystal.Therefore,it is difficult for the metal film to break down and the surface of particles does not form pit defects.In the process of carbon supply,molybdenum,as a strong carbon-binding element,easily consumes a part of carbon atoms,which makes the diffusion of carbon atoms difficult.When diamond particles grow,the growth rate of diamond can be reduced,thus the bubbles and impurities in the crystal can also be reduced and the grade of diamond is improved.

关 键 词：触媒 粘性金属 金属薄膜 金刚石 

分 类 号：TQ164[化学工程—高温制品工业]