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Effect of graphite addition on impregnated diamond bit properties

机译：石墨 添加对 孕镶金刚石钻头 性能的影响

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摘要

Graphite was used as a solid lubricant to reduce thermal damage in diamond bit when drilling without coolant. Graphite was added to the bit matrix material to reduce friction coefficient and heat. The influence of content, granularity, and surface metallization of graphite on the mechanical property and dry friction properties of the matrix, as well as the effect of diamond lifetime in the working layer were studied. Results showed that the hardness, bending strength, and friction coefficient of matrix gradually decreased with the increase in graphite concentration. Meanwhile, the abrasion loss decreased first and then increased, and the lifetime of diamond in the working layer gradually increased. With the decrease in graphite granularity, the bending strength and friction coefficient of matrix gradually decreased, whereas the hardness, abrasion loss of matrix, and diamond lifetime in the working layer gradually increased. After surface metallization of graphite, the hardness, bending strength, friction coefficient, and abrasion loss of matrix increased, whereas the lifetime of diamond in the working layer decreased. This study lays a foundation for drilling without water.
机译：石墨用作固体润滑剂，以减少在没有冷却剂的情况下钻孔时钻石钻头的热损坏。将石墨添加到比特矩阵材料中以减少摩擦系数和热量。研究了含量，粒度和表面金属化对基质的力学性质和干摩擦性能的影响，以及金刚石寿命在工作层中的效果。结果表明，随着石墨浓度的增加，基质的硬度，弯曲强度和摩擦系数逐渐降低。同时，磨损损耗首先下降，然后增加，工作层中的金刚石的寿命逐渐增加。随着石墨粒度的降低，基质的弯曲强度和摩擦系数逐渐减小，而基质的硬度，磨损损失和工作层中的金刚石寿命逐渐增加。石墨表面金属化后，硬度，弯曲强度，摩擦系数和基质的磨损损失增加，而工作层中的金刚石的寿命减少。这项研究为没有水的钻井奠定了基础。

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