铁基触媒中碳化硼含量对含硼金刚石单晶表观活化能的影响

通过在铁基触媒中添加适量的碳化硼,制备出了具有不同硼含量的含硼金刚石单晶。利用差热分析仪,测量了含硼金刚石单晶的差热和热重。采用Kissinger方法,计算了含硼金刚石单晶在加热过程中发生氧化反应的表观活化能,对比分析掺硼量对含硼金刚石单晶热稳定性的影响。结果表明:差热和热重测量值与表观活化能计算值的变化规律基本一致;随着掺硼量的增加,含硼金刚石单晶的热稳定性先提高后降低,剧烈氧化时表观活化能随着掺硼量的增加而减小。

Influence of B4C Content in the Iron-Based Catalyst on the Apparent Activation Energy of Boron-Doped Diamond Single Crystals

The boron-doped diamond single crystals with different boron amounts were synthesized by adding B₄C in iron-based catalyst. Based on the testing data of different thermal analysis (DTA) and thermal gravity (TG) analysis during heating process, the apparent activation energies were calculated by the Kissinger method. The effect of different boron amounts on their thermal stability and oxidation resistance were analyzed in oxidation reaction. The experimental and theoretical results showed that the variation trends of the DTA and TG are consistent with that of the apparent activation energy. In the severe oxidation process, both the thermal stability and the oxidation resistance of the boron-doped diamond single crystals increase firstly and then decrease with the increasing of boron amounts.