MoS2对热压Fe基金刚石钻头胎体性能的影响研究  

Effects of MoS2 on the matrix performance of hot-pressed Fe-based diamond drill bit

作　　者：章文姣[1] 谭松成[2] 潘秉锁[2] 金鑫 孔祥清[1] 龙尚琳 ZHANG Wenjiao;TAN Songcheng;PAN Bingsuo;JIN Xin;KONG Xiangqing;LONG Shanglin(School of Civil and Architectural Engineering,Liaoning University of Technology,Jinzhou 121001,China;Faculty of Engineering,China University of Geosciences(Wuhan),Wuhan 430074,China;CCTEG Xi’an Research Institute(Group)Co.,Ltd.,Xi’an 710077,China)

机构地区：[1]辽宁工业大学土木建筑工程学院,辽宁锦州121001 [2]中国地质大学(武汉)工程学院,湖北武汉430074 [3]中煤科工西安研究院(集团)有限公司,陕西西安710077

出　　处：《煤田地质与勘探》2023年第4期170-178,共9页Coal Geology & Exploration

基　　金：国家自然科学基金项目(42272365、41972327);岩土钻掘与防护教育部工程研究中心开放基金项目(201903);辽宁工业大学大学生创新创业训练计划项目(X2021082)。

摘　　要：金刚石钻头是勘探工作中的常见破岩工具,但金刚石热稳定性较差,在钻进过程中会不断产生热量,干旱缺水条件下钻头自冷却对钻进效率的提高具有非常重要的意义。为降低干钻条件下钻头胎体与岩石界面间的摩擦因数从而减少钻进过程中金刚石的热损伤,在热压Fe基金刚石钻头胎体中添加二硫化钼(MoS2),研究MoS2含量对Fe基钻头胎体相对密度、洛氏硬度、抗弯强度以及与白刚玉砂轮干磨时的磨损量和摩擦因数的影响,并用扫描电子显微镜(SEM)和能谱仪(EDS)等测试仪器分析了抗弯强度和摩擦磨损试验后的试样断口和表面的形貌及物相成分。试验结果表明,在试验范围内,Fe基胎体相对密度与MoS2含量关系不大,但是与未添加MoS2的Fe基胎体相比,其相对密度提高了约2.5%,达98%以上。Fe基胎体洛氏硬度随着MoS2含量的增加先增大后减小,在MoS2体积分数为8%时胎体硬度最大,洛氏硬度HRB值达101.3。Fe基胎体抗弯强度随着MoS2含量的增加先增大后减小,在MoS2体积分数为2%时胎体抗弯强度最大,达1140 MPa。Fe基胎体磨损量随着MoS2含量的增加先减小后增大,在MoS2体积分数为4%时磨损量最小,为0.376 g。Fe基胎体与岩石界面间的摩擦因数则随着MoS2含量的增加而逐渐下降,在MoS2体积分数为10%时摩擦因数最小,为0.325。抗弯强度断裂试样断口形貌和物相分析表明,MoS2的加入降低了Fe基胎体显微组织的连续性。摩擦磨损试验后试样形貌分析表明,MoS2的加入降低了摩擦磨损过程中的粘着磨损和塑性变形。研究成果为减少干钻条件下金刚石磨损和热损伤,提高胎体耐磨性,延长钻头寿命奠定了理论基础。Diamond drill bit is a common rock breaking tool in various exploration works,but the diamond in drill bit has poor thermal stability.As heat is constantly generated during the drilling process,the self-cooling of diamond drill bit under the condition of drought and water shortage is very important to improve the drilling efficiency.In order to decrease the friction coefficient between bit matrix and rock interface under dry drilling condition and reduce the thermal damage of diamond during drilling,molybdenum disulfide(MoS2)was added into the Fe-based diamond bit matrix,and research was performed for the effects of MoS2 content on the relative density,Rockwell hardness and flexure strength of Fe-based bit matrix,as well as the wear loss and friction coefficient during the dry grinding with white corundum grinding wheel.Besides,the morphology and phase composition on the fracture and surface of the specimens after flexure strength test and the friction-wear test were analyzed by the test instruments such as scanning electron microscope(SEM)and the energy dispersive spectrometer(EDS).The test results show that the relative density of Fe-based matrix has little relationship with MoS2 content within the test range,but the relative density of Fe-based matrix containing MoS2 is increased by about 2.5%to more than 98%compared with the Fe-based matrix without MoS2.The Rockwell hardness of Fe-based matrix increases at first and then decreases with the increasing of MoS2 content,and the HRB value is up to 101.3 at the MoS2 volume fraction of 8%.The flexural strength of Fe-based matrix also increases at first and then decreases with the increasing of MoS2 content,and the flexural strength is maximized to 1140 MPa at the MoS2 volume fraction of 2%.The wear loss of Fe-based matrix decreases at first and then increases with the increasing of MoS2 content,and the wear loss is minimized to 0.376 g at the MoS2 volume fraction of 4%.The friction coefficient between the Fe-based matrix and rock interface decreases gradually with t

关 键 词：MOS2 金刚石钻头 热压Fe基胎体 机械性能 摩擦学性能 

分 类 号：TG74[金属学及工艺—刀具与模具] TQ164[化学工程—高温制品工业]