摘要
金刚石抗压强度是衡量人造金刚石机械性能的重要参数之一。本文以Griffith微裂纹理论为基础,认为对金刚石晶体颗粒进行表面氧化处理,使表面微裂纹钝化或消除.可以增强金刚石单晶颗粒强度和韧性。热力学计算表明,处理的温度越高,氧化反应进行的越彻底。但由于金刚石内部包裹体的存在,处理的时间和温度如果超过一定范围,就会对金刚石产生损伤,抗压强度或抗压强度提高值下降。本文选用熔融态的KNO3作为氧化剂,讨论在对金刚石单晶颗粒进行强化处理过程中时间与温度对抗压强度的影响,给出了金刚石表面氧化增强处理的温度和时间的适应区间:处理温度应控制在560℃～600℃之间,处理时间应在30min～60min之间。
The mechanical strength of diamond crystal particle is usually evaluated by measuring its compressive strength. Based on the Griffith theory, this paper suggested that the compressive strength of diamond can be enhanced by means of surface oxidation. Ther-modynamic calculating indicated that, the higher the temperature is, the more thoroughly the reaction goes on. However, if the temperature and time beyond a certain range it will be contrary to the calculated result because of inclusion. The diamond will be damaged and the compressive strength or compressive strength increment will drop. This paper discussed,using fused KNO3 as oxidizer,time and temperature s influence on diamonds compressive strength in course of the surface oxidation. The result showed that the temperature should be restricted between 560C and 600C and time should be selected between 30min and 60min.
出处
《金刚石与磨料磨具工程》
CAS
2003年第1期22-25,共4页
Diamond & Abrasives Engineering
基金
教育部优秀青年教师基金
河北省归国人员博士基金
河北省教育厅博士基金资助(2001135)
