金刚石在不同温度和压力下的强度及断裂

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 Diamond at Various Temperatures and Pressures

The strength of synthetic and natural diamonds was measured as a function of temperatureby using the soft impressor/slider technique.The results showed that the strength of diamond measured by using the soft impressor/slidertechnique at room temperature was consistent with that measured by using the normal method.At elevated temperatures, the fracture behaviour of diamond depended on temperature, meancontact pressur and the coefficient of friction. Two types of fractures were observed, (111) cleavagecracks were associated with high mean contact pressure and low temperature, whilst strain inducedcracks were produced on (11O) planes and associated with low mean contact pressure and hightemperature. A schematic map was plotted out to illustrate the fracture behaviour of diamond asa function of temperature and mean contart pressure.