Fluidic oscillator made of tungsten carbide, the core component of the fluidic hammer, has a significantly reduced service life under the erosion wear of drilling fluids with solid particles. Polycrystalline diamond composite (PDC) has the potential to solve this issue due to its extremely high hardness and wear resistance benefits. However, few studies on the slurry erosion wear of PDC have been reported. In this paper, a modified slurry erosion experimental device based on submerged abrasive water jets was used to study the erosion resistance of four grades of PDCs with grain sizes of 2–3, 5, 10 and 25 μm respectively. The erosion surface of the damaged PDC was observed by scanning electron microscope (SEM) and the erosive mechanism of the PDC was analyzed. The experimental results showed that PDC had excellent slurry erosion resistance. The erosion rate of PDC was 1/192–1/43 of that of tungsten carbide when the jet velocity was 100 m/s. The erosion rates of PDC increased with the rise of jet velocity, impact angle and erodent particle size. In addition, the erosion performance of debris represented by quartz to PDC is greater than that of weighting agents represented by barite and hematite. Further research also showed that PDC with fine grain has greater erosion resistance than PDC with coarse grain, except PDC2 ~ 3. At a high impact angle, the erosive mechanism was forming the craters due to the crushing of diamond grains and the pits due to the overall pullout of diamond grains, while at a low impact angle, the erosive mechanism was ploughing and forming directional craters.

射流锤的核心部件碳化钨制成的射流振荡器，在带有固体颗粒的钻井液的冲刷磨损下，使用寿命显着降低。聚晶金刚石复合材料 (PDC) 具有极高的硬度和耐磨性优势，有可能解决这个问题。然而，很少有关于PDC泥浆冲刷磨损的研究报道。本文采用基于浸没式磨料水射流的改良浆料冲刷实验装置，研究了粒径分别为2~3、5、10和25 μm的四种等级的PDC的抗冲刷性能。采用扫描电镜(SEM)观察受损PDC的侵蚀面，分析PDC的侵蚀机理。实验结果表明，PDC具有优异的耐泥浆侵蚀性。当射流速度为 100 m/s 时，PDC 的侵蚀速率是碳化钨的 1/192-1/43。PDC的侵蚀速率随着射流速度、冲击角和侵蚀颗粒大小的增加而增加。此外，以石英为代表的碎屑对PDC的冲刷性能大于以重晶石和赤铁矿为代表的加重剂。进一步的研究还表明，除PDC2~3外，细晶粒PDC比粗晶粒PDC具有更高的抗侵蚀能力。在大冲击角下，侵蚀机制是由于金刚石颗粒的破碎而形成陨石坑和由于金刚石颗粒的整体拉出，而在低冲击角下，侵蚀机制正在犁地并形成定向陨石坑。PDC的侵蚀速率随着射流速度、冲击角和侵蚀颗粒大小的增加而增加。此外，以石英为代表的碎屑对PDC的冲刷性能大于以重晶石和赤铁矿为代表的加重剂。进一步的研究还表明，除PDC2~3外，细晶粒PDC比粗晶粒PDC具有更高的抗侵蚀能力。在大冲击角下，侵蚀机制是由于金刚石颗粒的破碎而形成陨石坑和由于金刚石颗粒的整体拉出，而在低冲击角下，侵蚀机制正在犁地并形成定向陨石坑。PDC的侵蚀速率随着射流速度、冲击角和侵蚀颗粒大小的增加而增加。此外，以石英为代表的碎屑对PDC的冲刷性能大于以重晶石和赤铁矿为代表的加重剂。进一步的研究还表明，除PDC2~3外，细晶粒PDC比粗晶粒PDC具有更高的抗侵蚀能力。在大冲击角下，侵蚀机制是由于金刚石颗粒的破碎而形成陨石坑和由于金刚石颗粒的整体拉出，而在低冲击角下，侵蚀机制正在犁地并形成定向陨石坑。以石英为代表的碎屑对PDC的冲刷性能大于以重晶石和赤铁矿为代表的加重剂。进一步的研究还表明，除PDC2~3外，细晶粒PDC比粗晶粒PDC具有更高的抗侵蚀能力。在大冲击角下，侵蚀机制是由于金刚石颗粒的破碎而形成陨石坑和由于金刚石颗粒的整体拉出，而在低冲击角下，侵蚀机制正在犁地并形成定向陨石坑。以石英为代表的碎屑对PDC的冲刷性能大于以重晶石和赤铁矿为代表的加重剂。进一步的研究还表明，除PDC2~3外，细晶粒PDC比粗晶粒PDC具有更高的抗侵蚀能力。在大冲击角下，侵蚀机制是由于金刚石颗粒的破碎而形成陨石坑和由于金刚石颗粒的整体拉出，而在低冲击角下，侵蚀机制正在犁地并形成定向陨石坑。