超声场中镍-氧化铈纳米复合材料的电铸工艺  

Preparation of Ni-CeO_2 Nano-composites by Electro-forming in an Ultrasonic Field

作　　者：薛玉君[1] 李济顺[1] 李航[1] 马伟[1] 孙勇[1] 

机构地区：[1]河南科技大学机电工程学院

出　　处：《特种铸造及有色合金》2008年第2期142-144,共3页Special Casting & Nonferrous Alloys

基　　金：河南省高校创新人才基金资助项目(2005-126);河南科技大学重大科学前期预研专项(2004ZD003);河南省机械设计及传动系统重点实验室和河南省高校先进制造技术重点学科开放实验室主任基金资助项目

摘　　要：采用电铸方法在超声场中制备了Ni-CeO2纳米复合材料,研究了超声波功率、CeO2纳米颗粒添加量、阴极电流密度对纳米复合材料中CeO2含量的影响,考察了超声波作用下的电铸速率和电流效率,并对纳米复合材料表面形貌和显微硬度进行了检测。结果表明,超声场中制备Ni-CeO2纳米复合材料的最佳工艺参数:超声波功率为300W,频率为28kHz,CeO2纳米颗粒添加量为40g/L,阴极电流密度为6A/dm2,镀液温度范围在45～60℃,在最佳工艺条件下可获得CeO2质量分数为3.0%的Ni-CeO2纳米复合材料;与无超声作用时制备的Ni-CeO2纳米复合材料相比,其表面形貌更平整、组织更致密、晶粒更细小。在电铸中引入超声波,可抑止纳米颗粒的团聚,促进纳米颗粒与基体金属均匀共沉积,进一步细化晶粒;并且可以提高电铸速率和电流效率,明显提高纳米复合材料的显微硬度。Ni-CeO2nano-composites were prepared by electroforming in an ultrasonic field.The effects of ultrasonic power,CeO2nano-particle addition and cathode current density on the content of CeO2 in the nano-composites have been investigated,and the electroforming velocity and current efficiency with the ultrasonic effect have been analyzed.The surface morphology and micro-hardness of the nano-composites have been examined.The results indicate that the desirable Ni-CeO2 nano-composites containing 3.0%CeO2 can be prepared with the CeO2 particles addition of 40 g/L and ultrasonic power of 300 W at frequency of 28 kHz and cathode current density of 6 A/dm2,exihiting more smooth morphology with more compact structure and finer grain size,compared with that of Ni-CeO2 nano-composites prepared in the absence of ultrasonic field.The ultrasonic field can promote the co-deposition of nano-particle with the matrix to further refine the grain size as a result of restraining the agglomeration of the nano-particle,and it can obviously increase the micro-hardness of the composites as well as raising the electro-forming speed and electric current efficiency.

关 键 词：超声波 电铸 CEO2 纳米复合材料 

分 类 号：TB383.1[一般工业技术—材料科学与工程]