复合电镀强化金刚石颗粒对钻头性能的影响

Effect of Composite Electroplating Strengthened Diamond Particles on the Performance of Bit

为提高孕镶金刚石钻头的碎岩效率和钻进寿命,提出复合电镀强化金刚石颗粒形成钻头胎体局部非均质化的思路,将金刚石在钻头胎体中的出刃效果和包镶强度分离开来。采用化学镀和复合电镀强化了金刚石颗粒,热压烧结制备了金刚石钻头胎体。研究了金刚石颗粒在复合电镀强化后的性能变化、钻头胎体的摩擦磨损特性、金刚石在钻头胎体中的出刃状态和结合界面。结果表明,复合电镀强化金刚石颗粒表面获得一层改性金属镀层,镀层形貌致密均匀,与金刚石结合状态良好;复合电镀强化金刚石颗粒有效提高了金刚石的表面润湿性和抗冲击性能;非均质化胎体结构保证了金刚石缓慢出刃过程和出刃高度。复合电镀强化金刚石颗粒有效提高了金刚石钻头的综合性能。

To enhance the rock-crushing efficiency and drilling life of impregnated diamond drill bits, a strategy was proposed for the localized heterogenization of the drill bit matrix through composite electroplating reinforcement of diamond particles, separating the protrusion effect of diamonds in the drill bit matrix from their encapsulation strength. Diamond particles were strengthened by electroless plating and composite electroplating. Subsequently, the diamond drill head body was prepared through hot pressing sintering. Studies were conducted on the performance changes of the composite electroplating strengthened diamond particles, the friction and wear characteristics of the drill head body, and the protrusion state and binding interface of the diamonds within the drill head body. Results showed that a modified metal coating was obtained on the surface of diamond particles strengthened by composite electroplating. The morphology of the coating was dense and uniform, with good bonding with diamond. The composite electroplating strengthened diamond particles effectively improved the surface wettability and impact resistance of diamond. The heterogeneous matrix structure ensured the slow protrusion process and the protrusion height of the diamond. The composite electroplating strengthened diamond particles effectively improved the comprehensive performance of the diamond bit.