Matrix material for a new 3D-printed diamond-impregnated bit with grid-shaped matrix

Abstract

Abstract In order to improve the efficiency of drilling hard rock formation, the matrix structure of diamond-impregnated bit is designed as grid shape, and the basic parameters of this diamond-impregnated bit with grid-shaped matrix is theoretical analyzed. Two kinds of test samples, made by two selected 3D printing materials (Inconel 718 and CoCrMo alloy), are prepared by using powder metallurgy, and the optimum sintering parameter is determined by studying the effect of sintering temperature on three-main mechanical properties, hardness, abrasive resistance and bending strength. Also the mechanical properties of Inconel 718 and cobalt chromium alloy fetal bodies sintered at the optimum sintering temperature are compared with traditional WC matrix composite. It shows that the Inconel718 and the CoCrMo alloy can possess the optimal mechanical properties when the sintering temperature is 1050\u202f°C. Meanwhile, CoCrMo alloy indicates to be more suitable for the matrix material of DIBGM due to its similar mechanical properties with WC matrix. The 3D printing working layer test and the rock cutting test confirmed the feasibility of the CoCrMo alloy acting as a matrix material, and the 3D-printed grid pieces that suitable for the hard rock with different strength are summarized as well.