钎焊气氛对金刚石磨耗特性的影响  

Effect of Brazing Atmospheres on Wear Characteristics of Diamond

作　　者：陈燕[1] 徐鸿钧[1] 苏宏华[1] 傅玉灿[1] 徐九华[1] 

机构地区：[1]南京航空航天大学精密和微细制造技术江苏省重点试验室,南京210016

出　　处：《中国机械工程》2008年第22期2733-2737,共5页China Mechanical Engineering

基　　金：国家自然科学基金资助项目(50475040);航空科学基金资助项目(2005ZH52060);江苏省自然科学基金资助项目(BK2006723);教育部新世纪优秀人才资助项目(NCET-07-0435)

摘　　要：采用NiCr合金钎料,通过Ar气保护和真空钎焊的方法制备了钎焊金刚石耐磨性试件,并研究了钎焊气氛对金刚石磨耗特性的影响。结果表明:在试验条件完全相同的情况下,不同的钎焊气氛导致金刚石磨耗特性不同,即经真空钎焊金刚石的磨耗特性表现为破碎方式,而经Ar气保护炉中钎焊金刚石的磨耗特性初始表现为磨耗平台方式,其后随着磨耗平台面积的增大,金刚石出现破碎。最后采用Ar气保护和真空钎焊方式制作了金刚石套料钻并进行了钻削试验,由于磨耗特性的不同,Ar气保护炉中钎焊套料钻较真空钎焊套料钻具有更长的使用寿命。Applying furnace brazing in vacuum and argon gas respectively, the brazed diamond specimens with Ni-Cr brazing alloy were prepared, and the effect of brazing atmospheres on diamond wear characteristics were studied. The results show that the wear characteristics of brazed diamond in different brazing atmospheres are varied under the same experimental conditions. Broken--up is the main mechanism for brazed diamond grits in vacuum; while wear flat and broken--up are the main mechanism for those in argon gas. Finally, the contrastive grinding tests show that the tool life and wear behavior of brazed diamond core drills in different brazing atmospheres are different.

关 键 词：钎焊气氛 磨耗特性 金刚石套料钻 磨耗平台 破碎 

分 类 号：O613.71[理学—无机化学] TH117.3[理学—化学]