摘要
通过在铁基触媒中加入氮化硼的方法,高温高压合成了IIb型金刚石.用光学显微镜对IIb型金刚石与Ib型金刚石的单晶形貌结构进行观察.利用冲击韧性测定仪、静压强度仪及差热分析仪对IIb型金刚石与Ib型金刚石在空气中的热稳定性进行了系统的对比研究.结果一致表明,合成的IIb型金刚石较Ib型金刚石不仅具有优异的热冲击韧性和静压强度,而且具有较好的热稳定性,并通过差热分析提出了进一步提高金刚石热稳定性的有效地途径.金刚石的热分解过程与其重量的损失是同步的,表明失重是由金刚石石墨化和氧化引起的.
The IIb type diamond was synthesized at high temperature and high pressure （HTHP） by using the technique of adding BN in a Fe-based catalyst. The appearance of the IIb type and the Ib type diamond was studied under an optical-microscope. Static compressive strength measurement, impact toughness measurement and DTA and TG analysis were used to research the thermal stability of these two types of diamonds in the atmosphere. The results demonstrate that the IIb type diamond possesses not only fine static compressive strength and thermal impact toughness, but also has excellent thermal stability. In addition, an available method is put forward to improve the thermal stability of the diamond. Thermal decomposition and mass loss of the diamond happened at the same time which shows that it is graphitization and oxidation of the diamond that causes the mass loss.
出处
《山东大学学报（工学版）》
CAS
2007年第6期41-43,65,共4页
Journal of Shandong University（Engineering Science）
基金
国家自然科学基金(50372035
50371048)
教育部高等学校博士点基金(20040422020)
关键词
IIb金刚石
高温高压
热冲击韧性
静压强度
热稳定性
the IIb type diamond
, high temperature and high pressure
thermal impact toughness
static compressive strength
thermal stability
作者简介
王美（1983-），女，山东临沂人，博士研究生，主要从事含硼金刚石的结构与性能检测E-mail：msli@sdu．edu．cn
