The particle size and particle size ratio of the raw diamond powder have a great influence on the stacking density, which is critical to the performance of polycrystalline diamond compact (PDC). In this study, diamond powders with five different particle size of 1 μm, 4 μm, 12 μm, 20 μm and 27 μm were selected. High stacking density diamond powder formulations with three filler particle ratios of 10 wt%, 20 wt% and 30 wt% were designed by using 12 μm, 20 μm and 27 μm diamond as the main particles and 1 μm and 4 μm diamond as the filler particles. The different formulations were evaluated by mechanical property tests and microscopic characterization of PDC samples to find out the optimal filler particle size as well as filler ratio in different main particle series. The results showed that the larger the main particle size in the formulation, the worse the wear resistance and the better the impact toughness of PDC. Adding decent number of fine particles with appropriate particle size could effectively improve the comprehensive performance of PDC. But the match between different main particles and filler particles was not consistent, and the three optimal formulations finally derived under the conditions in this paper were 80 wt%12 μm-20 wt%1 μm, 90 wt%20 μm-10 wt%4 μm, and 80 wt%27 μm-20 wt%4 μm. The rock cutting life of PDC with optimal formulations was all improved by 20 passes and the wear resistance was improved by 62%, 53.8% and 40.4%, respectively, compared with the single particle size control group. The impact toughness was improved by 650 J/68.4%, 1200 J/77.4% and 750 J/20%, respectively. The PDC performance variation pattern of different formulations was highly consistent with that of Co content, indicating that the decrease of Co content caused by the increase of stacking density was the main mechanism for performance enhancement of dual-particle size PDC.

中文翻译：

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双粒径金刚石配方的高堆积密度 PDC 的 HPHT 烧结和性能研究


金刚石原料粉的粒度和粒度比对堆积密度影响很大，而堆积密度对聚晶金刚石复合片（PDC）的性能至关重要。本研究选择了1μm、4μm、12μm、20μm和27μm 5种不同粒径的金刚石粉末。以12 μm、20 μm和27 μm金刚石为主要颗粒，1 μm和4 μm金刚石为填料，设计了10 wt%、20 wt%和30 wt%三种填料颗粒配比的高堆积密度金刚石微粉配方。颗粒。通过机械性能测试和 PDC 样品的微观表征来评估不同的配方，以找出最佳的填料粒径以及不同主要颗粒系列中的填料比例。结果表明，配方中主粒径越大，PDC的耐磨性越差，冲击韧性越好。添加适量、粒径合适的细颗粒可有效提高PDC的综合性能。但不同主颗粒与填料颗粒的匹配度并不一致，在本文条件下最终得出的3种最佳配方分别为80 wt%12 μm-20 wt%1 μm、90 wt%20 μm-10 wt%4 μm、80wt%27μm-20wt%4μm。优化配方的PDC岩石切削寿命较单一粒径对照组均提高20道次，耐磨性分别提高62%、53.8%和40.4%。冲击韧性分别提高了650J/68.4%、1200J/77.4%和750J/20%。 不同配方的PDC性能变化规律与Co含量高度一致，表明堆垛密度增加引起的Co含量降低是双粒径PDC性能提升的主要机制。