多元纳米颗粒强化WC-青铜基金刚石钻头胎体材料

Properties of WC-bronze based matrix material for diamond bit reinforced by multielement nanoparticles

为提高孕镶金刚石钻头胎体性能,使其更好地满足钻探需求,向WC–青铜基胎体材料中加入纳米NbC和纳米WC颗粒,研究其对胎体力学性能、微观结构的影响。利用配方均匀设计法、回归分析和规划求解得到纳米颗粒的最优添加量,并烧制钻头开展室内钻进试验。结果表明:加入纳米NbC和纳米WC后,WC–青铜基胎体材料的硬度和抗弯强度最高提高25.23%和5.73%;含金刚石的胎体材料的耐磨性明显增强,其磨耗比最高升高57.4%;金刚石与胎体之间结合得更加紧密。纳米颗粒强化后的孕镶金刚石钻头的机械钻速提高19.63%,单位进尺工作层消耗减少32.84%,说明纳米颗粒能强化孕镶金刚石钻头,提高其钻进效率,并延长钻头寿命。

Nano-NbC and nano-WC were added to the WC-bronze based matrix to improve the performance of the matrix of the impregnated diamond bit.The uniform design method,regression analysis and solver were used to obtain the optimal addition.Laboratory drilling experiments of the strengthened bits were carried out.The results show that after adding nanoparticles,the hardness and the bending strength of the matrix are improved by up to 25.23%and 5.73%.The wear resistance of the diamond composites is significantly increased,with wear ratio increased by up to 57.4%,indicating that the diamond and the matrix are more closely bonded.In conclusion,adding nanoparticles has positive significance on the performance of diamond composites.The mechanical drilling speed of the strengthened bits is 19.63%higher than that of the blank diamond bit,and that the matrix wear is reduced by 32.84%,indicating that the addition of nanoparticles to the matrix can strengthen the drill bit and improve drilling efficiency.