摘要
使用钎焊法制造了单层金刚石取孔钻,并与电镀单层金刚石取孔钻的加工性能进行了比较。发现由于具有高的金刚石出刃和结合强度,钎焊取孔钻的锋利度和寿命都优于电镀取孔钻。通过光学显微镜、扫描电子显微镜(SEM)、能谱分析(EDX)和X射线衍射等对钢基体钎料合金金刚石的界面微观结构和成分进行了观察和分析,发现钎料合金中的Ni,Cr元素向钢基体中有一定的扩散;而在钎料合金和金刚石上分别存在反应层。钎料合金反应层主要是金刚石表面的C原子扩散进入液相后与Cr反应生成的Cr3C2和Cr7C3,而金刚石反应层是石墨化金刚石表面的位错通道与Cr反应形成Cr3C2并渗透到一定的深度形成的。
Mono-layer diamond drill bit was fabricated by high temperature brazing.The performance of brazed drill bit was compared with the electro-plated diamond drill bit in the hole drilling of silicate glass.It was found that the sharpness and the tool life of the brazed drill bit are superior to the electro-plated one due to the higher diamond grit protrusion and cohesion between diamond and filler alloy.By observation of optical microscope,scanning electron microscope,energy dispersive X-ray analysis and X-ray diffraction analysis,the microstructure and the composition of the interfaces on steel substrate-filler alloy-diamond were investigated.The diffusion of Ni and Cr from filler alloy into steel substrate was found.Reaction layers in filler alloy and diamond were identified respectively.Main phases in filler alloy reaction layer are Cr3C2 and Cr7C3,which are the reaction products of the diffusion carbon and Cr in the filler alloy.The reaction layer in diamond may be induced by the penetration of Cr into the dislocation core of graphitized diamond and formation of Cr3C2.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第3期21-24,共4页
Transactions of The China Welding Institution
基金
国家自然科学基金资助项目(50605009)
广东省科技攻关项目(2005B10201027)
广东工业大学博士启动基金(043035)
关键词
钎焊
金刚石取孔钻
界面
微观结构
brazing
diamond drill bit
interface
microstructure
