摘要:
摘要 本文研究了一种金刚石微粉堆积体静压强度的测定方法，该方法的受力状态与聚晶金刚石制品的受力状态接近，用静压破碎方法表征金刚石微粉的强度要强于传统的冲击韧性（impact toughness）检测法。在金刚石微粉堆积体静压强度实验中，金刚石微粉堆积体静压强度与金刚石微粉的形貌正相关，对于相同粒度的25-35μm微粉，类球度0.4801圆润度0.8385的HZ 25～35μm微粉的静压强度为95.1而类球度0.3260/圆润度0.7286的EZ 25～35μm微粉静压强度为55.6。金刚石微粉堆积体静压强度还与金刚石微粉的内部杂质含量相关，对于8-12微粉，内部杂质总含量15×10-6的二型料静压强度为94.73，内部杂质总含量10×10-6的四型料静压强度为98.78，内部杂质总含量5×10-6的八型料静压强度为99.07。金刚石微粉堆积体静压强度还与金刚石微粉的粒度负相关，修订后的模型用于同时对比两种不同粒径的金刚石微粉的静压强度。经对比检测4～8μm微粉的静压强度为97.9，15～25μm微粉的静压强度为85.4，8～16μm微粉的静压强度为82.3。本实验还取用金刚石混合粉做静压强度检测，并组装合成聚晶金刚石复合齿，同时检测聚晶金刚石复合齿的力学性能，结果表明混合粉与聚晶金刚石复合齿的力学性能正相关。由于金刚石微粉堆积体静压强度与金刚石微粉理化参数以及聚晶金刚石复合齿的力学性能紧密相关，静压强度检测方法可以作为评价金刚石微粉性能的一项重要参数。
Abstract:
ABSTRACT In this paper, a method for measuring the static pressure strength of diamond micropowder is studied, the stress state of this method is similar to that of polycrystalline diamond products, and the strength of diamond micropowder characterized by static pressure crushing method is stronger than that characterized by traditional impact toughness method. In the static pressure strength experiment of the diamond micropowder stack, the static pressure strength of the diamond micropowder stack is positively correlated with the morphology of the diamond micropowder, The HZ 25～35 μmpowder with sphericity of 0.4801 and roundness of 0.8385 had a static strength of 95.1, while the EZ 25～35μm powder with sphericity of 0.3260/roundness of 0.7286 had a static strength of 55.6. The static pressure strength of diamond micropowder is also related to the internal impurity content of diamond micropowder. For 8～12μm micropowder, the static pressure strength of the second type material with the total internal impurity content of 15×10-6 is 94.73, the static pressure strength of the fourth type material with the total internal impurity content of 10×10-6 is 98.78, and the static pressure strength of the eighth type material with the total internal impurity content of 5×10-6 is 99.07. The static pressure strength of diamond micropowder is also negatively correlated with the particle size of diamond micropowder, and the revised model is used to compare the static pressure strength of two different particle sizes of diamond micropowder simultaneously. The static pressure strength of 4 ~ 8 μmmicropowder is 97.9, that of 15 ~ 25 μmmicropowder is 85.4, and that of 8 ~ 16 μmmicropowder is 82.3. In this experiment, the mixed diamond powder was used to test the static pressure strength, and the polycrystalline diamond composite teeth were assembled. At the same time, the mechanical properties of the polycrystalline diamond composite teeth were tested. The results showed that the mixed powder was positively correlated with the mechanical properties of the polycrystalline diamond composite teeth. Because the static pressure strength of diamond powder is closely related to the physical and chemical parameters of diamond powder and the mechanical properties of polycrystalline diamond composite teeth, the static pressure strength testing method can be used as an important parameter to evaluate the performance of diamond powder.
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