Experimental Study on the Materials and Performance of Diamondimpregnated Cutter

Rock-breaking efficiency and wear resistance of diamond-impregnated cutter (DIC) are important evaluation indexes of comprehensive rock-breaking performance. The comprehensive performance index of DIC is influenced by its composition and sintering method. A method for screening the material composition and testing the performance of DIC was proposed in this study to improve the rock-breaking efficiency and prolong service life of diamond-impregnated bit in hard stratum. In this method, through the establishment of the test model of DIC material, the performance of DIC prepared by different sintering methods were compared, and the DIC material suitable for hard formation was determined. Performance experiments were carried out to verify the rationality of calcining DIC with the addition of composite diamond particles with 60%WC+15%FeCuXP+25%CuSn as basic material. Results show that the DIC calcined via hotpressing sintering demonstrates satisfactory wear resistance, high rock breaking efficiency, and long service life. Rate of penetration (ROP) and wear rate of single or composite grain size of DIC are positively correlated with diamond grain size. Small grain size indicates small ROP and wear rate. The comprehensive performance index of DIC with the single grain size is lower than that with composite grain size. The comprehensive performance index of the single grain size of DIC is only 0.91, while that of composite grain size of DIC reaches 0.96. This study can provide a theoretical reference for developing DIC with satisfactory wear resistance and high rock breaking efficiency. © 2021 School of Science, IHU. All rights reserved.