适用于栅格状孕镶金刚石钻头的胎体配方研究

为了提高钻进坚硬岩层的工作效率，将孕镶金刚石钻头胎体结构设计为栅格状，分析了栅格状孕镶金刚石钻头钻进岩层时的碎岩方式，并采用粉末冶金法制备Inconel 718和CoCrMo试样，通过分析不同烧结温度对两种胎体试样的硬度、耐磨性及抗弯强度的影响，确定了两种材料的最优烧结参数，并对其在该烧结温度下的力学性能进行对比分析。研究结果表明:Inconel 718和CoCrMo均具有较好的抗弯强度，满足钻进坚硬岩层对胎体抗弯强度的要求。Inconel 718的硬度比传统WC基胎体材料小，试样磨损量较大，适合用于地质灾害应急勘查等要求钻进速度快的极端情况；CoCrMo的硬度及耐磨性与传统WC基胎体接近，适合作为孕镶金刚石钻头的胎体材料。 

Matrix formula for impregnated diamond bit with grids

In order to improve the efficiency of drilling the hard rock formation, the structure of impregnated diamond bit matrix was designed as grid shape, and the rock fragmentation mechanism of impregnated diamond bit with grids matrix was theoretical analyzed while drilling hard rock formation. Also, Inconel 718 and cobalt chromium alloy samples were prepared by using powder metallurgy, the optimum sintering parameter was determined by studying the effect of sintering parameters on the hardness, abrasive resistance and bending strength. For comparison, the mechanical properties of Inconel 718 and cobalt chromium alloy fetal bodies sintered at the optimum sintering parameter were tested. The results show that Inconel 718 and cobalt chromium alloy both have a high bending strength, which meet the requirements of the bending strength of the matrix. The hardness of Inconel 718 is lower than traditional WC matrix and its abrasive resistance is faint. This is more suitable to be applied in the special working conditions of fast drilling speed, such as emergency investigation of geological disasters; besides, the hardness and abrasive resistance of cobalt chrome alloy are close to the traditional WC matrix and thus cobalt chrome alloy is more suitable to be used as an impregnated diamond bit matrix material.