scholarly journals Surface Engineering of Biodegradable Implants: Emerging Trends in Bioactive Ceramic Coatings and Mechanical Treatments

2021 ◽  
Author(s):  
Sagar Nilawar ◽  
Mohammad Uddin ◽  
Kaushik Chatterjee
Keyword(s):  
Biodegradable Polymers ◽  
Surface Engineering ◽  
Ceramic Coatings ◽  
Biodegradable Implants ◽  
Emerging Trends ◽  
Bioactive Ceramic

Biodegradable polymers, metals, and ceramics have emerged as promising alternatives to prepare degradable implants in recent years as better alternatives to conventional non-degradable implants to treat a broad range of...

The Future of Plasma-Based Surface Engineering Techniques in Tribology (Keynote)

2005 ◽  
Author(s):  
Allan Matthews ◽  
Adrian Leyland
Keyword(s):  
Surface Engineering ◽  
Performance Enhancement ◽  
Bulk Material ◽  
Cost Savings ◽  
Cost Effective ◽  
Ceramic Coatings ◽  
Performance Improvements ◽  
Treatment Techniques ◽  
Wide Range ◽  
Macro Scale

Over the past twenty years or so, there have been major steps forward both in the understanding of tribological mechanisms and in the development of new coating and treatment techniques to better “engineer” surfaces to achieve reductions in wear and friction. Particularly in the coatings tribology field, improved techniques and theories which enable us to study and understand the mechanisms occurring at the “nano”, “micro” and “macro” scale have allowed considerable progress to be made in (for example) understanding contact mechanisms and the influence of “third bodies” [1–5]. Over the same period, we have seen the emergence of the discipline which we now call “Surface Engineering”, by which, ideally, a bulk material (the ‘substrate’) and a coating are combined in a way that provides a cost-effective performance enhancement of which neither would be capable without the presence of the other. It is probably fair to say that the emergence and recognition of Surface Engineering as a field in its own right has been driven largely by the availability of “plasma”-based coating and treatment processes, which can provide surface properties which were previously unachievable. In particular, plasma-assisted (PA) physical vapour deposition (PVD) techniques, allowing wear-resistant ceramic thin films such as titanium nitride (TiN) to be deposited on a wide range of industrial tooling, gave a step-change in industrial productivity and manufactured product quality, and caught the attention of engineers due to the remarkable cost savings and performance improvements obtained. Subsequently, so-called 2nd- and 3rd-generation ceramic coatings (with multilayered or nanocomposite structures) have recently been developed [6–9], to further extend tool performance — the objective typically being to increase coating hardness further, or extend hardness capabilities to higher temperatures.

Interface Biomechanical Properties between Femora and Bioactive Ceramic Coatings Prostheses during the Initial Implant Stage

2007 ◽  
Vol 336-338 ◽  
pp. 1806-1809
Author(s):  
Liu Ding Tang ◽  
W.M. Zhao ◽  
L.Y. Tian ◽  
Bing Zhe Li
Keyword(s):  
Circumferential Stress ◽  
Biomechanical Properties ◽  
Ceramic Coatings ◽  
Homogeneous Layer ◽  
Ti Alloy ◽  
Biomechanical Models ◽  
Press Fit ◽  
The Press ◽  
Shearing Strength ◽  
Bioactive Ceramic

Biomechanical models of implanting prostheses into femora by means of press fit, i.e. the mechanics of non-homogeneous layer-like composites, have been used to quantify the press-fit strength and circumferential stress of the interface, when femora are partially replaced by different thicknesses of bioactive ceramic coatings on a prosthesis surface during the initial implant stage. The maximum press-fit strength appears on the interface between femora and Ti alloy prostheses with non-coating; the press-fit strength decreases with the increased thickness of the coating. The circumferential stress displayed as the large tensile stress at the femoral side of the interface; the compressive stress, appeared at the side of the coating and Ti alloy prosthesis. The shearing strength, jointing between the prostheses and femora would be bigger with the thinner bioactive ceramic coatings. Considering the biodegradability of bioactive ceramic coatings, e.g. hydroxyapatite, HA, it is concluded that the optimum thickness of the bioactive ceramic coatings will be about 50-60 microns.

Mineralization Behavior of Bioactive Ceramic Coatings Formed by Micro-Arc Oxidation on Titanium

2007 ◽  
Vol 330-332 ◽  
pp. 629-632 ◽  
Author(s):  
Kai Hui Nan ◽  
G.X. Pei
Keyword(s):  
Calcium Phosphate ◽  
Simulated Body Fluid ◽  
Titanium Oxide ◽  
Body Fluid ◽  
Ceramic Coatings ◽  
P Elements ◽  
Micro Arc Oxidation ◽  
Bioactive Ceramic ◽  
The Difference ◽  
Titanium Oxide Films

Titanium oxide films were obtained by MAO at the applied voltages of 250-550V and their bio-mineralization behavior was investigated. The films were composed mainly of TiO2 phases in the form of anatase and rutile and enriched with Ca and P elements in the form of CaTiO3 and amorphous calcium phosphate. Their bio-mineralization behavior was evaluated in a simulated body fluid (SBF). After immersed in SBF for 72 h, white mineralized layers were observed on the samples obtained at high voltages. The bio-mineralized rate of samples increased with the applied voltages, which resulted in the difference on morphology of different samples. The structure and composition of the films have an important effect on their bio-mineralization behavior.

Increased Resistance to Mechanical Shock of Metallic Materials by Metal-Ceramic Surface Coatings

2015 ◽  
Vol 638 ◽  
pp. 316-321
Author(s):  
Carmen Biniuc ◽  
Bogdan Istrate ◽  
Corneliu Munteanu ◽  
Luca Dorin
Keyword(s):  
Mechanical Properties ◽  
Surface Engineering ◽  
Microscopic Analysis ◽  
Scratch Test ◽  
Ceramic Coatings ◽  
Experimental Results ◽  
Ceramic Surface ◽  
Mechanical Shock ◽  
Metal Powders ◽  
Metal Ceramic

In the last time, material engineering in lately developed the design and processing technology of materials in well-defined goals. Thus, they designed and achieved the metal alloys for use in strong fields required mechanical shock using methods of surface engineering. In this direction, we have developed very superficial deposition techniques by thermal spray of ceramic and metal powders, both for hard coating and to protect surfaces in refractory environments. In a controlled manner, can form new structures, which leads to an improvement in the tribological properties of the coatings obtained. In this paper are described experimental results obtained after the tests of resistance to mechanical shock testing of metal-ceramic coatings on forged titanium support. We analyzed the behavior of thermal deposited layers of ZrO2 stabilized with 8% Y2O3 and Al2O3 after applying mechanical shock test and scratch test. These materials were analyzed in terms of structural, of mechanical properties and adhesion of the surface layers using electron microscopy, X-ray diffraction, Charpy device, CETR UMT-2 tribometer. The results showed that the materials investigated have a stratified columnar structure, shows lamellar and intra - lamellar cracks and pores formed between neighbor "splat's". From microscopic analysis, after these tests, it was observed that the thermal deposited layers were not separated and there was a fingerprint on their surface. The experimental results show that the new structures obtained presents much better mechanical properties compared to the material, forged titanium, no deposit.

Bioactive Ceramic Coatings for Metallic Implants

2012 ◽  
pp. 59-84
Author(s):  
Niko Moritz ◽  
Paula Linderbäck ◽  
Timo Närhi
Keyword(s):  
Ceramic Coatings ◽  
Metallic Implants ◽  
Bioactive Ceramic
Sign in / Sign up

Export Citation Format

Share Document