Fabrication and evaluation of bulk nanostructured cobalt intended for dental and orthopedic implants.
Bulk nanostructured cobalt (Co) was fabricated by a combination of high energy ball milling and warm pressing. The obtained cobalt has an average grain size of 35nm with measured hardness and elastic modulus of 7.32GPa and 211.4GPa, respectively. Dry sliding wear testing shows such bulk nanostructured Co has high sliding wear resistance. However, electrochemical study shows that such Co has a relatively high corrosion rate and no passive behavior in the artificial saliva solution. X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) analysis further reveal that the corrosion product is composed of insoluble cobalt (II) phosphate and cobalt hydroxide. The evaluation results suggest that bulk nanostructured cobalt can be a promising wear resistant material but may not be suitable for dental/orthopedic implants.
Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong, China. Electronic address: renfz@sustc.edu.cn.
Fuzeng
F
Ren
Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong, China.
Weiwei
W
Zhu
Department of Materials Science and Engineering, South University of Science and Technology of China, Shenzhen 518055, Guangdong, China.
Kangjie
K
Chu
D003035:Cobalt / Q000737:chemistry*; D003343:Corrosion; D015921:Dental Implants; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry*; D056951:Photoelectron Spectroscopy; D019736:Prostheses and Implants; D014961:X-Ray Diffraction
D015921:Dental Implants; D003035:Cobalt
Corrosion; Nanostructured cobalt; Wear; XPS