自润滑孕镶金刚石钻头胎体材料初步研究

Elementary Study on Self-lubricating Matrix Material for Impregnated Diamond Bit

摘要:

为了研究具有自润滑性能的孕镶金刚石钻头胎体材料，进行了在胎体配方中添加石墨的研究。对胎体材料的抗弯强度、硬度、耐磨性和材料与白刚玉砂轮组成摩擦副时的摩擦系数进行了测定，并用扫描电子显微镜观察了磨损表面形貌。实验结果表明，添加石墨后，胎体材料的硬度和抗弯强度下降，与60目白刚玉砂轮组成摩擦副时的摩擦系数下降，耐磨性则随着石墨含量的增多先增强，后下降（超过6%后）。形貌分析表明，不含石墨的胎体材料在磨损中发生明显的塑性变形；添加石墨后，胎体材料的塑性降低，出现犁沟和剥落现象。

Abstract:

To develop matrix material with self-lubricating ability for impregnated diamond bit, research was made on addition of graphite power to conventional matrix formula. The bending strength, hardness, wear resistance and friction coefficient (with 60# white corundum grinding wheel as counter) of matrix materials were tested; the topography of wear surfaces was analyzed with scanning electric microscope. The test results showed that the bending strength and hardness of matrix material declined with graphite powder adding and the friction coefficient decreased with 60# white corundum grinding wheel; while wearing resistance increased at first with graphite content increasing, then decreased when the content of graphite exceeded 6.0%. Morphology analysis indicated that conventional matrix material produced obvious plastic deformation in wearing and the plasticity of matrix material declined with graphite adding, and furrow wears and flaking appeared.