激光焊接金刚石工具过渡层预合金粉末的试验研究  

An experimental study on pre-alloyed powder of transition layer for laser welding diamond tools

作　　者：秦海青[1] 谢志刚[1] 向波[2] 黄艳华[2] 

机构地区：[1]桂林矿产地质研究院国家特种矿物材料工程技术研究中心,广西桂林541004 [2]中南大学粉末冶金国家重点实验室,湖南长沙410083

出　　处：《超硬材料工程》2007年第3期7-11,共5页Superhard Material Engineering

基　　金：广西科学研究与技术开发计划项目(桂科能05112001-2B1)资助

摘　　要：目前可以用于制备激光焊接金刚石工具过渡层粉末的方法主要有机械混合法、雾化法和化学共沉淀法。化学共沉淀法生产的粉末成分均匀,实现了粉末的预合金化,并且设备简单,生产成本低。此次试验采用草酸盐化学共沉淀法,成功制备了3种不同成分的激光焊接金刚石工具过渡层预合金粉末。焊接强度测试表明,3种粉末的焊接强度均满足欧盟EN13236安全标准,其中2#粉末的焊缝强度最高。X射线物相分析结果表明,3种粉末的主相都是Co3Fe7和CoFe。此外,固定Fe与Co的质量比,加入2wt.%的铜可以有效提高预合金粉末过渡层的焊接强度和稳定性。这是因为,Cu原子完全溶入到Co3Fe7或CoFe晶胞中并形成固溶体,产生了固溶强化。At present,the methods that are adapted to manufacture transition layer powder for welding diamond tools include the following three ways：（1） commixing the components by the machine;（2） atomization;（3） chemical co-precipitation.However,the components of powder manufactured by chemical co-precipitation are uniform and pre-alloy of the powder is achieved.Moreover,the cost is low with simple equipment.So three different kinds of pre-alloyed transition layer powder for laser welded diamond tools were prepared by oxalate chemical co-precipitation method in this study.The welding intensity of these three kinds of pre-alloyed powder has met the EN13236 standard.And the welding intensity of 2# powder is the best in these kinds of pre-alloyed powder.The results of XRD indicated that all the major phases of these three kinds of pre-alloyed powder were Co3Fe7 and CoFe.Moreover,the welding intensity and stability of pre-alloyed powder were prominently improved by adding 2wt.% Cu while the quality ratio of Fe to Co is invariable.The reason is that Cu atoms enter into the crystal cell of the Co3Fe7 or CoFe completely and form solid solution to intensify welding toughness.

关 键 词：金刚石工具 激光焊接 过渡层 粉末试制 预合金 共沉淀 

分 类 号：TQ164[化学工程—高温制品工业]