(1. 湖南科技大学 海洋矿产资源探采装备与安全技术国家地方联合工程实验室，湘潭 411201； 2. 中南大学 有色金属成矿预测与地质环境监测教育部重点实验室，长沙 410083)
摘 要: 基于孕镶金刚石钻头在坚硬复杂地层钻进效率低的现象，将SiC、棕刚玉和合金钢丸作为胎体耐磨性弱化颗粒添加至胎体中，采用室内钻进及SEM扫描电镜分析等手段研究硬质磨粒材质对胎体力学性能和摩擦磨损行为的影响。结果表明：在胎体中添加适当材质的硬质磨粒，可提高钻头的钻进时效，能够避免钻进打滑现象；SiC磨粒对胎体的耐磨性、抗弯强度等力学性能影响较明显，宜作为胎体耐磨性弱化颗粒，其浓度宜控制在20%~40%之间，粒径在425~500 μm之间；硬质磨粒在胎体中一方面利用其易脆性破碎的物理力学特性改善胎体微观磨损形貌，为金刚石正常出刃创造前提条件；另一方面破碎脱落的游离态磨粒利用其硬脆特性能够直接对单颗粒金刚石产生修锐效应。
关键字: 胎体耐磨性弱化；孕镶金刚石钻头；碎岩机理；硬质磨粒；耐磨匹配性
（1. National Local Joint Engineering Laboratory of Marine Mineral Resources Exploration Equipment and Safety Technology, Hunan University of Science and Technology, Xiangtan 411201, China; 2. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Central South University, Changsha 410083, China）
Abstract:Based on drilling efficiency decrease when diamond bit drilling extra-hard and strong-abrasive rocks, brown corundum, SiC and cemented carbide shot particle were taken as matrix weaken elements and put into matrix. The matrix weaken particle materials influences on matrix structure, friction and wear characteristics were studied by interior drilling test and SEM. The result show that matrix weaken particle can enhance drilling efficiency and avoiding drilling slipping. SiC particle can remarkable influence wear-resisting and bending strength of matrix, the suitable concentration is 20%-40%, grain size is 425-500 μm. The main effect of hard abrasive particles in matrix is improve the micro wear morphology for diamond exposure by brittle characteristics and sharpening diamond by hard characteristics.
Key words: weakening matrix; impregnated diamond bit; rock fragmentation mechanism; particle for weakening matrix; wear resistance
