Wear studies on ZrO2-filled PEEK as coating bearing materials for artificial cervical discs of Ti6Al4V.
Polyetheretherketone (PEEK) and its composite coatings are believed to be the potential candidates' bio-implant materials. However, these coatings have not yet been used on the surface of titanium-based orthopedics and joint products and very few investigations on the tribological characteristics could be found in the published literature till date. In this study, the wettabilities, composition and micro-hardness were characterized using contact angle measurement, scanning electron microscopy (SEM) and hardness tester. The tribological tests were conducted using a ball-on-disc contact pair under 25% newborn calf serum (NCS) lubricated condition. For comparison, bare Ti6Al4V was studied. The obtained results revealed that those PEEK/ZrO2 composite coatings could improve the tribological properties of Ti6Al4V significantly. Adhesive wear and mild abrasive wear might be the dominant wear and failure mechanisms for PEEK/ZrO2 composite coatings in NCS lubricated condition. After comprehensive evaluation in the present study, 5wt.% ZrO2 nanoparticles filled PEEK coating displayed the optimum tribological characteristics and could be taken as a potential candidate for the bearing material of artificial cervical disc.
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China.
Jian
J
Song
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China. Electronic address: liuyuhong@tsinghua.edu.cn.
Yuhong
Y
Liu
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; Biomechanics and Biotechnology Lab, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China.
Zhenhua
Z
Liao
Department of Mechanical Engineering, Tsinghua University, Beijing 100084, China; Biomechanics and Biotechnology Lab, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China.
Song
S
Wang
Department of Mechanical Engineering, Indian Institute of Technology (BHU) Varanasi, Varanasi 221005, India.
Rajnesh
R
Tyagi
State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China; Biomechanics and Biotechnology Lab, Research Institute of Tsinghua University in Shenzhen, Shenzhen 518057, China. Electronic address: weiqliu@hotmail.com.
Weiqiang
W
Liu
D000497:Alloys; D001577:Benzophenones; D002574:Cervical Vertebrae / Q000187:drug effects*; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D017276:Friction; D006244:Hardness; D007403:Intervertebral Disc / Q000187:drug effects*; D007659:Ketones / Q000737:chemistry*; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011092:Polyethylene Glycols / Q000737:chemistry*; D011108:Polymers; D013052:Spectrometry, X-Ray Emission; D014025:Titanium / Q000494:pharmacology*; D015040:Zirconium / Q000737:chemistry*
D000497:Alloys; D001577:Benzophenones; D020099:Coated Materials, Biocompatible; D007659:Ketones; D011108:Polymers; C031462:titanium alloy (TiAl6V4); C063834:polyetheretherketone; D011092:Polyethylene Glycols; D015040:Zirconium; D014025:Titanium; C028541:zirconium oxide
Artificial cervical disc; Coating; PEEK; Wear; Zirconia