触媒组织中碳化物的含量与金刚石的生长  

Relationship between content of carbide in catalyst and growth of diamond single crystal

作　　者：李和胜[1] 亓永新[1] 崔建军[1] 李木森[1] 

机构地区：[1]山东大学材料科学与工程学院

出　　处：《材料热处理学报》2008年第4期21-24,共4页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(50772060);山东省自然科学基金(Y2007F12);山东省博士后创新项目专项基金(200702024)

摘　　要：采用粉末冶金铁基触媒在六面顶压机上高温高压合成金刚石。试验表明,在相同的工艺条件下,由于合成腔体温度和压力梯度的存在,压块不同断面上的合成效果存在明显差异。使用X射线衍射(XRD)和电子探针分析(EPMA)对不同断面上的触媒物相与成分进行了检测。结果发现,金刚石形核量较多,分布均匀,且晶形完整的触媒中存在大量碳化物;触媒中夹杂有原始石墨,碳化物形成不充分,则金刚石形核量较少。分析认为,触媒中的碳化物应该才是高温高压下金刚石生长的直接碳源。触媒熔体充分溶解石墨,碳化物充分形成对于提高金刚石的产量和质量是必需的。Diamond single crystal was synthesized at high temperature and high pressure in a six-anvil high pressure apparatus with iron-based catalyst made by powder metallurgy, It is found that the synthesized products on different section in a same assembled bulk are markedly different even under the same synthetic technology. The phase and composition of catalyst that corresponds to different synthesizing effects were investigated by means of XRD and EPMA. The results indicate that the better quality and higher yield of diamond can be obtained for the catalyst with more carbides. However, only few diamond nucleates in the catalyst with less carbide and bulk graphite. It is suggested that in order to obtain better results of diamond growth, a large number of metal carbides is essential because it likely is the direct carbon source for diamond growth at high temperature and high pressure.

关 键 词：铁基触媒 碳化物 人造金刚石 高温高压 

分 类 号：TQ164[化学工程—高温制品工业]