Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第18卷    第8期    总第113期    2008年8月

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文章编号:1004-0609(2008)08-1512-05
超声波化学预镀改善烧结Nd-Fe-B表面Ni-P合金结合力
吴元騄,应华根,罗 伟,严 密

(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)

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150 W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。

 

关键词: 烧结Nd-Fe-B磁体;化学镀;Ni-P镀层;结合力

Improved adhesion of electroless Ni-P coatings on sintered Nd-Fe-B magnets by pre-plating in ultrasonic field
WU Yuan-lu, YING Hua-gen, LUO Wei, YAN Mi

State Key Laboratory of Silicon Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

Abstract:The effects of pre-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.

 

Key words: sintered Nd-Fe-B magnets; electroless plating; Ni-P coatings; adhesion

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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