中文摘要：

为了更加科学地设计低温低压无冲洗介质条件下的金刚石钻头胎体，基于金刚石钻头干钻时出现高温摩擦热的现象，采用向胎体中添加石墨作为润滑剂的方案，以减小胎体的摩擦因数，降低摩擦热．研究石墨的体积分数、粒度对胎体力学性能和不同环境下对胎体摩擦性能的影响，结果表明：随着石墨体积分数的增加，胎体的硬度，抗弯强度，常温常压、低温低压下的摩擦因数逐渐减小，磨损量先减小后增大，当石墨体积分数增加到7．5％时，磨损量达最小值．随着胎体中石墨粒度的减小，胎体的抗弯强度和常温常压、低温低压下的摩擦因数逐渐减小，胎体的硬度和磨损量逐渐增大．摩擦磨损后胎体的形貌分析表明，加入石墨后，胎体在不同环境下的磨损均减轻，可实现对钻头胎体的润滑作用．

英文摘要：

To design diamond bit matrix more scientific without the fluid medium under low temperature and low pressure,based on the high friction heat when diamond bits drill in the dry condition,a new method of adding graphite to the bit matrix is adopted to reduce the matrix＇s friction coefficient and friction heat.The effect of the content and the particle size of graphite on the matrix mechanical properties and friction performance under different environment is studied.The research results show that with increasing of the graphite content,the hardness,the bending strength and the friction coefficient of the matrix under normal temperature pressure,and low temperature pressure decrease gradually,while the abrasion loss decreases firstly,then increases,and from which the minimum abrasion loss is obtained when the graphite content reaches 7.5%.With the decreasing of the graphite particle size,the bending strength and the friction coefficient of the matrix decrease gradually,while the hardness and the abrasion loss of the matrix increases little by little.The feature analysis of the matrix after friction and wear also shows that to add proper graphite in the bit matrix can reduce its wear and help to lubricate the interface between the matrix and the drilled rock.