WC含量对金刚石钻头胎体性能的影响研究

Effect of WC content on the properties of impregnated diamond bit matrix

以 WC-Cu-Co 基金属结合剂为基础，研究 WC 质量分数对结合剂性能的影响。对不同质量分数WC 配方的三点抗弯强度、磨损失重、硬度进行了测试，利用 XRD 对烧结试样进行了成分分析，通过扫描电镜对试样断口形貌进行了观察，最后通过微钻实验验证实际钻进效果。研究结果表明：随着 WC 质量分数的增加，胎体的三点抗弯强度τ0在一定范围内呈现先上升然后迅速下降的趋势；磨损失重Δm 值呈现明显的下降趋势；硬度 HRB 则呈上升趋势。XRD 结果表明：形成的新相主要是 Ni17 Sn3。试样断口的SEM 照片表明：WC 质量分数不宜过高，以 WC 质量分数为40%的效果最好。微钻实验表明：WC 质量分数为30%和40%时，金刚石钻头分别具有最佳的钻进寿命和钻进效率，此配方体系可完全适用于（6~8级）中硬地层。

Based on the WC-Cu-Co metal bond,the influence of WC content on the metal matrix were researched.Three point bending strength,weight loss and hardness of different WC content were analyzed. x-ray diffractometry （XRD）, scanning electron microscope （SEM） and micro-drill experiment were adopted to analyze the matrixes＆#39;microstructure and practical drilling effect.Results showed that the matrix＆#39;s three point bending strength τ0 increased to the maximum,and then reduced with increasing WC content,that weight loss Δm decreased regularly and that hardness HRB tended to increase.XRD showed that Ni1 7 Sn3 was formed as the new phase and SEM showed that 40% WC would be better.Micro-drill experiment showed that 30 wt% and 40 wt% WC in matrix were suitable for medium-hard formation.