COMPARATIVE STUDY OF WEAR BEHAVIOR OF MULTILAYER COATINGS FOR HUMAN HIP PROSTHESIS

摘要

Artificial hip joints have been implanted throughout the world into patients suffering from disabling hip joint disease, to restore their painless joint function. This means replacing the femoral head and acetabular socket with artificial prosthetic components. In order to obtain artificial implants with enhanced physical, chemical, mechanical, biological and tribological properties resulting in the accelerated self-adaptation of human body and long term performance, it is necessary to combine the advantages of materials with various properties; biocompatibility, bioactivity, excellent corrosion resistance, high fatigue and tensile strength, low modulus of elasticity, coefficient of friction, and high wear resistance. The present work focuses on investigating the wear rate of multi-layer coatings for different combinations in order to reduce the wear rate of the prosthesis. Three different combinations of multilayer coating were deposited by plasma arc spraying technique on titanium. It was found that the multi-layer coating consists of Alumina as a primary coating and Zirconia as the secondary coating provides lower wear rate and higher hardness compared to other combinations which would give optimal performance and thereby increasing its longevity.