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设计Fe-Cu基胎体配方,研究Fe质量分数对金刚石钻头胎体及钻进性能影响。测试不同配方下烧结试样的硬度、相对密度与三点抗弯强度,使用扫描电镜对断口进行微观分析,通过模拟钻进实验测试钻头的钻进效率与寿命。结果表明:Fe-Cu基配方胎体具有较好的烧结成型性,胎体相对密度可达到理论密度的98%;胎体硬度随Fe质量分数的增加先增加后下降,在Fe质量分数大于45%时趋于平稳、质量分数为60%时达到最大值,为35HRC;胎体三点抗弯强度的变化规律不明显,数值变化不大。断口SEM结果表明:随Fe质量分数增加,韧性下降,金刚石刻蚀加重。模拟钻进实验表明:在Fe质量分数为30%时,钻头对6~8级可钻性地层具有较好的钻进效率与寿命。
The Fe-Cu matrix was designed to study the effect of Fe content on the matrix and drilling performance of diamond drill bits. The hardness, relative density and three-point bending strength of sintered samples under different formulations were tested. The fracture surface was analyzed microscopically by SEM, and the drilling efficiency and life span of the drill were tested by simulating drilling experiments. The results show that the matrix of Fe-Cu matrix has better sintering formability and the relative density of matrix can reach 98% of the theoretical density. The hardness of matrix increases first and then decreases with the increase of Fe content. When the mass fraction of Fe is more than 45 %, It tends to be stable, the maximum value is reached at 60%, which is 35 HRC. The change law of three-point bending strength of the carcass is not obvious, and the values change little. SEM results show that the fracture toughness decreases with the increase of Fe mass fraction and the diamond etching increases. Simulated drilling experiments show that when the mass fraction of Fe is 30%, the drilling bit has better drilling efficiency and life for formations of drillability of 6 ~ 8 grades.