超声波化学预镀改善烧结Nd-Fe-B表面Ni-P合金结合力  

Improved adhesion of electroless Ni-P coatings on sintered Nd-Fe-B magnets by pre-plating in ultrasonic field

作　　者：吴元騄[1] 应华根[1] 罗伟[1] 严密[1] 

机构地区：[1]浙江大学硅材料国家重点实验室材料科学与工程系,杭州310027

出　　处：《中国有色金属学报》2008年第8期1512-1516,共5页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50471041);教育部新世纪优秀人才支持计划资助项目(05-0526);教育部创新团队发展计划资助项目(IRT-0651)

摘　　要：采用超声波化学预镀方法,研究超声波功率对Ni-P镀层与烧结Nd-Fe-B磁体结合力的影响。采用扫描电镜观察镀层与磁体的表面和截面组织形貌,采用X射线衍射仪测定镀层的相组成和晶体结构。结果表明,随超声功率的增加,Ni-P镀层与磁体的结合力逐渐提高,当超声功率为150W时,镀层结合力达到最大值。与无超声场下的Ni-P化学镀层相比,经超声波预镀工艺获得的镀层组织均匀、结构致密,镀层与磁体结合紧密。分析超声波改善镀层与磁体结合力的机理,认为超声波的搅拌作用和空化作用有助于提高镀层与磁体的结合力。The effects ofpre-plating in ultrasonic field on the adhesion of electroless Ni-P coatings to sintered Nd-Fe-B magnets were investigated. The adhesion of Ni-P coatings to magnets with different ultrasonic power was measured by an adhesion tester. The surface and cross-sectional morphologies of the coatings were observed through SEM. The phase structure of the coatings was identified by X-ray diffraction patterns. The results show that the adhesion of Ni-P coating to Nd-Fe-B magnet was enhanced with increasing ultrasonic power. When increasing ultrasonic power up to 150 W, the adhesion strength reaches the maximum. Synchronously, a uniform and compact deposit can be obtained by pre-plating in ultrasonic field. It is suggested that the ultrasonic pre-plating contributes to the improvement of adhesion through two ways： stirring and cavitation action.

关 键 词：烧结ND-FE-B磁体 化学镀 NI-P镀层 结合力 

分 类 号：TG174.45[金属学及工艺—金属表面处理]