纳米Si_3N_4/Ni复合镀层对金刚石节块性能的影响  

Effect of nano-Si_3N_4/Ni composite coatings on the properties of diamond bits

作　　者：肖长江[1] 

机构地区：[1]河南工业大学材料科学与工程学院,郑州450001

出　　处：《粉末冶金材料科学与工程》2015年第6期900-906,共7页Materials Science and Engineering of Powder Metallurgy

基　　金：河南省科技攻关计划项目(142102210406)

摘　　要：用滚镀的方法在金刚石表面镀Ni层和纳米Si_3N_4/Ni复合镀层,用扫描电子显微镜观察金刚石镀前和镀后的表面形貌,用DKY-1型单颗粒抗压强度测定仪测量金刚石单颗粒的抗压强度。用热压烧结的方法得到铁基结合剂金刚石节块,在INSTRON-5569型万能材料试验机上测量节块的抗弯强度,在NMW-1立式万能摩擦磨损试验机上测试节块的耐磨性。结果表明:在金刚石表面镀Ni层和纳米Si_3N_4/Ni复合镀层后,表面镀层均匀,纳米Si_3N_4/Ni复合镀层比纯Ni层更致密,更平滑,晶粒更细小;纳米Si_3N_4/Ni复合镀层金刚石单颗粒有更高的抗压强度;纳米Si_3N_4/Ni复合镀层金刚石铁基结合剂节块有更高的抗弯强度和更优良的耐磨性。Ni coating and nano-Si3N4/Ni composite coating on the diamond surface were prepared by a barrel plating method. The surface morphologies of single diamond particle before and after plating were observed using scanning electron microscopy and the compressive strengths measuring on DKY-1 type tester. Fe-matrix bonding diamond bits were sintered using a hot pressing method, the flexural strengths and wear resistances of bits were investigated using INSTRON-5569 universal material and NMW-1 vertical universal testing machine, respectively. The results show that plating Ni coating and nano-Si3N4/Ni composite coating on the diamond surface are uniform. Moreover, nano-Si3N4/Ni composite coating possesses denser, smoother and finer microstructure as compared to pure Ni coating, therefore the single diamond particle with a nano-Si3N4/Ni composite coating has greater compressive strength, and Fe-matrix bonding diamond bits with nano-Si3N4/Ni composite coatings have higher flexural strength and better wear resistance.

关 键 词：纳米Si3N4/Ni 复合电镀 铁基结合剂 金刚石节块 表面形貌 力学性能 

分 类 号：TB333[一般工业技术—材料科学与工程]