(1. 河南科技大學(xué) 機(jī)電工程學(xué)院，洛陽 471003；
2. 河南科技大學(xué) 河南省機(jī)械設(shè)計(jì)及傳動(dòng)系統(tǒng)重點(diǎn)實(shí)驗(yàn)室，洛陽 471003)
摘 要: 采用掃描電鏡和X射線衍射分析Ni-CeO2納米復(fù)合電鑄層的表面形貌和結(jié)晶取向，研究超聲波對(duì)電鑄層顯微硬度和耐磨損性能的影響。結(jié)果表明：由于電鑄過程中引入的超聲波的強(qiáng)力攪拌作用、超聲空化效應(yīng)和聲流擾動(dòng)效應(yīng)，可以有效抑制CeO2納米顆粒在鍍液中的團(tuán)聚，并促使其在電鑄層中均勻分布，進(jìn)一步細(xì)化了Ni結(jié)晶晶粒；超聲波的引入可促進(jìn)Ni晶體沿(111)和(220)晶面方向的生長，改變電鑄層的結(jié)晶取向；與無超聲波作用相比，超聲波作用下制備的納米復(fù)合電鑄層顯微硬度高、耐磨損性能優(yōu)良，在CeO2添加量為40 g/L時(shí)所制備的納米復(fù)合電鑄層的顯微硬度最高、磨損率最低。
關(guān)鍵字: CeO2納米顆粒；納米復(fù)合電鑄層；電鑄；超聲波
（1. School of Mechatronics Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. Henan Key Laboratory for Machinery Design and Transmission System,
Henan University of Science and Technology, Luoyang 471003, China）
Abstract: The surface morphologies and crystal orientation of the prepared Ni-CeO2 nanocomposite electroforming deposits were examined by scanning electron microscopy (SEM) and X-ray diffractometry (XRD), respectively. The effects of ultrasound on the microhardness and wear resistance of the nanocomposite electroforming deposits were also evaluated. The results show that because of the introduction of ultrasound in the electrodepositing process, the strong stirring effect, cavitation effect and acoustic streaming effect by ultrasound effectively restrain the agglomeration of CeO2 nanoparticles in the bath, and promote the uniform distribution of CeO2 nanoparticles in the electroforming deposit. The CeO2 nanoparticles with uniform distribution in the electroforming deposit can contribute to further refine the nickel electrocrystalline grains. The crystal growth of Ni electrocrystalline along the (111) face and (200) face is promoted in the presence of ultrasound, so that the crystal orientation of the electroforming deposit changes. The Ni-CeO2 nanocomposite deposits prepared with ultrasound exhibit higher microhardness and better wear resistance than those prepared without ultrasound. The Ni-CeO2 nanocomposite deposits with an addition of 40 g/L CeO2 nanoparticles in the presence of ultrasound have a maximal microhardness and minimal wear rate.
Key words: CeO2 nanoparticles; nanocomposite electroforming deposits; electroforming; ultrasound
