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The properties of diamond bits sintered by hot-pressed with different metal matrix materials are different, among which cobalt-based bits are popular because of their good comprehensive properties, but the price of cobalt-based bits is higher. In order to improve the cost performance, replacing cobalt (Co) with iron (Fe) is one of the common methods to improve the cost performance of diamond bits. However, the replacement of Co by Fe has adverse effects on the wear performance of diamond bits, thus affecting the working life of diamond bits, and further affecting the drilling efficiency. Therefore, it is of great significance to study the iron-based matrix modification treatment method and friction and wear performance of iron-based hot-pressed diamond bit to reduce the drilling cost and improve the drilling efficiency. The matrix material of iron-based hot-pressed diamond bit was magnetically treated by magnetic treatment equipment, and the influence of magnetic treatment parameters on the wear performance of iron-based hot-pressed diamond bit matrix was studied. Through the analysis of the worn surface morphology of the bit matrix, the influence and law of magnetic treatment on the wear resistance of the iron-based bit matrix were obtained. The results show that magnetostriction, magnetic field stress, and other factors can improve the structure of the bit matrix, and then affect the overall performance of the bit matrix. After magnetic treatment, the hardness of the bit matrix increases, the roughness decreases, the friction coefficient decreases, and the wear resistance increases.

Experimental study on wear performance of before and after magnetic treatment of hot-pressing sintering iron-based diamond bit matrix