激光焊接金刚石工具用铁钴预合金粉末的制备与性能  

Preparation and Performance of Prealloyed Powder for Laser Welding Diamond Tools

作　　者：向波[1] 谢志刚[1] 贺跃辉[1] 黄艳华[1] 秦海青 

机构地区：[1]中南大学粉末冶金国家重点实验室,湖南长沙410083 [2]桂林特邦新材料有限公司,广西桂林541004

出　　处：《机械工程材料》2007年第10期55-57,共3页Materials For Mechanical Engineering

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

摘　　要：采用共沉淀法制备了用于激光焊接金刚石工具过渡层的铁钴预合金粉末,用X射线衍射仪分析其物相组成,用扫描电镜观察其形貌特征;将预合金粉末进行热压烧结后,对其相对密度、硬度、抗弯强度和焊接性能进行了研究。结果表明:制备的粉末为FeCo(α′)相,随烧结温度的升高,烧结试样的相对密度略有增大,而硬度有所下降,抗弯强度变化较小;高温烧结试样的焊接性能优于低温烧结试样,在850℃烧结制备的试样焊接强度达到51.6 N.m。FeCo prealloyed powder for transition layer of laser welding diamond tools was fabricated by coprecipitation. The phase composition of the prealloyed powder was analysed by XRD and the morphology was observed by SEM. The relative density, hardness, bending strength and welding performance of the sintered samples fabricated by hot-press sintering with FeCo prealloyed powder were studied. The results show that the phase composition of prepared powder is FeCo（α＇） phase; relative density of sintering samples increases with the sintering temperature increased, but hardness decreases. The variation of bending strength is litter by the sintering temperature increased; the welding performance of samples fabricated by higher temperature is better than that of lower temperature, the welding strength is reach 51.6 N · m at 850 ℃.

关 键 词：铁钴预合金粉末 激光焊接 过渡层 

分 类 号：TF125[冶金工程—粉末冶金] TQ164[冶金工程—冶金物理化学]