金刚石聚晶复合片自锐性能的试验研究

 复合片钻头的钻速与其切削齿的自锐性密切相关，钻头台架试验反映了这种内在联系，并用平均钻速（v）和平均钻速变化率（α）等指标对复合片自锐性能进行描述与评价。试验结果表明，复合片的自锐性在微观上取决于聚晶体发生串晶断裂和沿晶界断裂的程度，宏观上则依赖于复合片双层结构间在耐磨性能上互为因果的关系。

EXPERIMENTAL STUDY ON THE SELF-SHARPENING PROPERTY OF PDC

The rate of penetration of PDC bits relates closely to its self-sharpening property. This relation can be tested through rig test which is performed with standard PDC test bit. At the same time the average rate of penetration (v) and average rate of change in ROP (a) can describe the self-sharpening property of PDC. From the analyses, it is thought that different sloughing forms of polycrystalline layers are microscopic evidence for different self-sharpening of PDC. From macroscopic view, the self-sharpening of PDC depends on the mutually interdependent relation of double layers on wear resistance.