Ni-金刚石复合涂层的结构优化及基础磨削性能

摘要

Ni-diamond composite coating was prepared on 304 stainless steel substrates by electrodeposition technique.The diamond composite coating structure was optimized by adding the amount of diamond and thickening time.Grinding performance of the optimized diamond composite coating sliding against different counterparts (GCr15,SiC,304 stainless steel) was evaluated by ball disc friction and wear tester.Results show that the diamond is uniform and dense when diamond concentration is 1.5 g/L.When the thickening time is 15 min,the embedding ratio of diamond is about 2/3,and the adhesion strength is better,which is suitable for the grinding process.The wear volume of GCr15,SiC,304 stainless steel are decreased in turn,respectively,as follows:0.353 76 mm3,0.315 90 mm3,0.194 01 mm3,and the diamond composite coating have better grinding performance for GCr15.Diamond composite coating grinding SiC,GCr15,304 stainless steel have occurred abrasive wear,in addition,GCr15 also has a weak chemical wear,stainless steel has a serious chemical wear and adhesive wear.%采用电沉积技术在304不锈钢基体上制备了Ni-金刚石复合涂层.通过金刚石掺入量、加厚镀时间优化了金刚石复合涂层结构,利用球-盘式摩擦磨损试验仪研究了优化后的金刚石复合涂层对不同材料偶件(GCr15、SiC、304不锈钢)的磨削性能.结果表明:金刚石掺入量为1.5 g/L时,金刚石上砂均匀且密集;加厚镀15 min时,金刚石埋入率约为2/3,附着强度较好,适合磨削加工;GCr15、SiC、304不锈钢3种材料偶件的磨损体积依次减小,分别为:0.353 76 mm3、0.315 90 mm3、0.194 01 mm3,金刚石复合涂层对GCr15有较好的磨削性能;金刚石复合涂层磨削GCr15、SiC、304不锈钢均发生了磨粒磨损,此外,GCr15还发生了微弱的化学磨损,不锈钢发生了较明显的化学磨损和粘着磨损.