本文利用软压头技术，测定了人造金刚石和天然金刚石在不同温度下的强度．在室温，利用软压头技术测得的金刚石强度与常规方法所得的结果一致．高温条件下，金刚石的断裂行为取决于试验温度、平均接触压力及摩擦系数.观察到两种类型的裂纹，｛111｝解理裂纹与低温、高压力有关.而应变诱发裂纹产生于｛110｝面上，与高温、低应力有关.根据试验结果，提出了金刚石在不同温度和应力状态下的强度图．
The strength of synthetic and natural diamonds was measured as a function of temperature by using the soft impressor/slider technique.The results showed that the strength of diamond measured by using the soft impressor/slider technique at room temperature was consistent with that measured by using the normal method.
At elevated temperatures, the fracture behaviour of diamond depended on temperature, mean contact pressur and the coefficient of friction. Two types of fractures were observed, (111)
cleavage cracks were associated with high mean contact pressure and low temperature, whilst strain induced cracks were produced on (110) planes and associated with low mean contact
pressure and high temperature. A schematic map was plotted out to illustrate the fracture behaviour of diamond as a function of temperature and mean contact pressure.
参考文献
| [1] | Field J E, “The Properties of Natural and Synthetic Diamond”, 1992, London Academic. 2 Xing Guangzhong (邢广忠), PhDTHesis(博士毕业论文): Teformation of Diamond under Conditions of Sliding Friction. 1995, University of Hull, UK. 3 Field J E, Freeman C J. Phil. Mag., 1981, A43: 595. 4 Hamilton G M, Goodman L E. J. Appl. Mech., 1966, 33: 371. 5 Brookes C A, et al. J. Hard Mats., 1990, 1: 3. 6 Brookes C A, Brookes E J, Xing G. Proc. MRS Spring Meeting, 1995, San Francisco, USA. |
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