空气冲旋钻头牙齿失效分析与新材料实验研究

针对目前空气冲旋钻头钻进中牙齿频繁断裂、脱落以及磨损严重，导致破岩效率低、使用寿命短等问题，采用纳米改型技术，在硬质合金中掺杂纳米Al₂O₃制备出Al₂O₃/WC Co纳米/微米复合材料，对其性能、组织结构进行分析，对其耐磨性、耐冲击性进行实验研究，结果表明：加入3%的纳米Al₂O₃并添加适量的抑制剂和稀土元素能明显改善Al₂O₃/WC Co纳米/微米复合材料的组织结构、细化晶粒，复合材料的耐磨性和耐冲击性能得到大幅提高，较硬质合金YG8提高4～8倍。为大幅度提高钻头破岩效率，延长钻头使用寿命提供了可能性。

ANALYSIS ON THE FAILURE OF AIR FLUSH ROTARY PERCUSSIVE DRILLING BIT TEETH AND EXPERIMENTAL STUDY ON NEW MATERIALS

The teeth of Air flush Rotary percussive Drilling bit often breaks,falls and badly worn,which leads to a low efficiency of rock breaking and a short service life.To solve the problem,we adopt the Nano modification technology which adds nanoAl₂O₃ to the hard alloy,then develop the Al₂O₃/WC Co Nano/Micro Composite Material.An analysis of its performance,micro structure and an experimental study on its resistance and impact resistance are made.The results indicates that adding 3% of nano Al₂O₃,appropriate amount of inhibitors,and Rare Earth Element(REE) can distinctly improve the micro structure of Al₂O₃/WC Co Nano/Micro composite and refine grains.It also greatly increases the wear resistance and impact resistance to 4~8 times than Hard alloy(YG8).All the above provide a possibility of improving the efficiency of rock breaking and extending the bit′s service life.