(浙江大學(xué) 硅材料國(guó)家重點(diǎn)實(shí)驗(yàn)室 材料科學(xué)與工程系，杭州 310027)
摘 要: 采用超聲波化學(xué)預(yù)鍍方法，研究超聲波功率對(duì)Ni-P鍍層與燒結(jié)Nd-Fe-B磁體結(jié)合力的影響。采用掃描電鏡觀察鍍層與磁體的表面和截面組織形貌，采用X射線衍射儀測(cè)定鍍層的相組成和晶體結(jié)構(gòu)。結(jié)果表明，隨超聲功率的增加，Ni-P鍍層與磁體的結(jié)合力逐漸提高，當(dāng)超聲功率為150 W時(shí)，鍍層結(jié)合力達(dá)到最大值。與無(wú)超聲場(chǎng)下的Ni-P化學(xué)鍍層相比，經(jīng)超聲波預(yù)鍍工藝獲得的鍍層組織均勻、結(jié)構(gòu)致密，鍍層與磁體結(jié)合緊密。分析超聲波改善鍍層與磁體結(jié)合力的機(jī)理，認(rèn)為超聲波的攪拌作用和空化作用有助于提高鍍層與磁體的結(jié)合力。
關(guān)鍵字: 燒結(jié)Nd-Fe-B磁體；化學(xué)鍍；Ni-P鍍層；結(jié)合力
（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
