铁基触媒合成金刚石单晶的表观活化能计算  

Calculations of apparent activation energy of diamond single crystals synthesized by iron-based catalyst

作　　者：张元培[1,2] 张娜[1,2] 亓永新[1,2] 李木森[1,2] 

机构地区：[1]山东大学材料液态结构及其遗传性教育部重点实验室,山东济南250061 [2]山东省超硬材料工程技术研究中心,山东邹城273500

出　　处：《超硬材料工程》2009年第4期14-18,共5页Superhard Material Engineering

基　　金：国家自然科学基金(50772060);山东省自然科学基金(Y2007F12);山东省博士后科研创新专项基金(200702024)

摘　　要：采用粉末冶金方法制成铁基片状触媒,以及在铁基触媒中添加碳化硼粉,通过高温高压方法制得常规金刚石单晶和含硼金刚石单晶。根据测定的DTA实验数据,利用K iss inger和O zaw a动力学模型分别计算了两种金刚石单晶剧烈氧化时的表观活化能。结果表明,含硼金刚石单晶的表观活化能明显高于常规金刚石单晶,因而具有更高的热稳定性。而两种动力学模型的计算结果相近,证明计算的表观活化能数值基本可信。Diamond single crystals and boron-doped diamond single crystals were synthesized under high temperature and high pressure by using iron-based catalysts without and with boron carbide produced by powder metallurgy technique, respectively. On the basis of the DTA results, the apparent activation energy of two kinds of diamond single crystals in vigorous oxidation was calculated by Kissinger and Ozawa dynamic models. As a conclusion, the apparent activation energy of the boron-doped diamond single crystals is larger than that of the boron-undoped diamond so that the thermal stability of the former is much higher than the latter. And the reliable values of apparent activation energy can be obtained due to the calculations of the two models are proximity.

关 键 词：铁基触媒 含硼金刚石 表观活化能 

分 类 号：TF123[冶金工程—粉末冶金] TQ164[冶金工程—冶金物理化学]