The influencing factors of static pressure strength of diamond micro powder deposits and its influence on the mechanical properties of polycrystalline diamond composite teeth

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.