FABRICATION OF DLC COATED COBALT-CEMENTED TUNGSTEN CARBIDE MICRO-DRILLS AND THEIR CUTTING PERFORMANCE  

DLC涂层硬质合金微钻的制备及其切削性能(英文)

作　　者：马玉平[1] 陈明[1] 向道辉[1] 孙方宏[1] 

机构地区：[1]上海交通大学机械与动力工程学院

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2007年第2期89-93,共5页南京航空航天大学学报（英文版）

基　　金：国家自然科学基金(50475026,50275095,50575135)资助项目;航空基础科学基金(04H57001)资助项目;教育部新世纪杰出人才基金(NCET-04-0384)资助项目~~

摘　　要：In machining the particle reinforced aluminum based composite material with high Si content using the cobalt-cemented tungsten carbide micro cutting tools, diamond like carbon （DLC） films are deposited on cobalt-cemented tungsten carbide micro-drills with two-step pretreatment method. Characteristics of DLC coated tools are investigated in bias-enhanced HFCVD system with the optimized hot filament arrangement. The optimization deposition technology is obtained and the wear mechanism of cutting tools is analyzed. The drilling performance of DLC coated tools is verified by the experiments of cutting particle reinforced aluminum based composite material （Si 15% in volume） compared with uncoated ones. Experimental results show that the two-step pretreatment method is appropriate for complex shaped cemented carbide substrates and ensures the good adhesive strength between the diamond film and the substrate. The cutting performance of DLC coated tool is enhanced 10 times when machining the Si particle reinforced aluminum based metal matrix composite compared with that of uncoated ones under the same cutting conditions.在硬质合金微型刀具加工高硅铝合金等难加工材料时,通过采用改进的热丝CVD装置开展了DLC涂层硬质合金微钻制备工艺优化,得到了最优沉积工艺,并配合高速加工高硅铝合金(Si15%)材料微小孔钻削性能对比试验,分析了刀具的磨损机理。结果表明:两步预处理方法适合复杂形状硬质合金衬底的预处理方法。钻削高硅铝合金时,DLC涂层具有低摩擦系数和高耐磨损特性,同等切削条件下,涂层微钻的切削寿命比未涂层硬质合金微钻提高了10倍。

关 键 词：DLC film bias-enhanced HFCVD cobalt-cemented tungsten carbide cutting tool micro-drilling cutting performance 

分 类 号：TB331[一般工业技术—材料科学与工程] TG701[金属学及工艺—刀具与模具]