Download or read book In Vitro Behaviour of Plasma Sprayed Hydroxyapatite Coatings written by Fazilah Fazan and published by . This book was released on 1999 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Structural Changes of Plasma Sprayed Hydroxyapatite Coatings During In Vitro Testing written by CC. Berndt and published by . This book was released on 1994 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: The in-vitro behavior of hydroxyapatite (HAp) coatings depends on the thermal history of the coating after thermal spraying. As-sprayed amorphous coatings degrade in Ringer's solution. Heat treatment at 800 °C for 2 hours produces a crystalline coating which upon immersion in physiological solution displays a greater stability. Coatings are characterized for surface morphology, composition, crystallinity, roughness, and weight loss. The as-sprayed coating shows changes in the coating morphology with immersion time. Individual lamellae crack and separate from the coating. Those lamellae still intact show evidence of dissolution. After a period of 8 weeks small HAp spheres cover the surface of the as-sprayed and heat treated coatings. These morphological changes are expected to influence the rate of bone bonding. Therefore post-treatment of HAp coatings is seen as a technique to alter or control implant-tissue interactions.
Download or read book Plasma Spray Coating written by Robert B. Heimann and published by John Wiley & Sons. This book was released on 2008-07-11 with total page 354 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the past two decades, thermal spraying of metallic, ceramic and composite coatings has emerged as a powerful tool for surface engineering, with many new applications and markets continually being developed. This book will help materials scientists and engineers to choose the most appropriate combination of materials, equipment, and operation parameters for the design of high-performance coatings with new functional properties and improved service life. Includes: * a thorough treatment of the fundamental physical processes governing plasma spray technology; * a critical assessment of advantages and disadvantages of the method compared with other suface coating techniques; * a discussion of basic equipment requirements and limitations; * case studies and typical applications to solve industrial problems. Plasma-Spray Coating offers a stimulating combination of basic concepts and practical applications. Materials scientists and engineers, as well as graduate students will find this book of enormous value.
Download or read book Microplasma Sprayed Hydroxyapatite Coatings written by Arjun Dey and published by CRC Press. This book was released on 2015-03-19 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: There has been enormous growth in the use of medical implants. However, in the case of hip replacement, loosening of metallic prosthesis fixed with polymethylmethylacrylate bone cement has resulted in painstaking revision surgery, which is a major problem for the patient, surgeon, and biomedical technology itself. In fact, global recognition of thi
Download or read book Bioceramic Coatings for Medical Implants written by Robert B. Heimann and published by John Wiley & Sons. This book was released on 2015-05-26 with total page 493 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting the progress in recent years, this book provides in-depth information on the preparation, chemistry, and engineering of bioceramic coatings for medical implants. It is authored by two renowned experts with over 30 years of experience in industry and academia, who know the potentials and pitfalls of the techniques concerned. Following an introduction to the principles of biocompatibility, they present the structures and properties of various bioceramics from alumina to zirconia. The main part of the work focuses on coating technologies, such as chemical vapor deposition, sol-gel deposition and thermal spraying. There then follows a discussion of the major interactions of bioceramics with bone or tissue cells, complemented by an overview of the in-vitro testing methods of the biomineralization properties of bioceramics. The text is rounded off by chapters on the functionalization of bioceramic coatings and a look at future trends. As a result, the authors bring together all aspects of the latest techniques for designing, depositing, testing, and implementing improved and novel bioceramic coating compositions, providing a full yet concise overview for beginners and professionals.
Download or read book In vitro Investigation of Air plasma Sprayed Hydroxyapatite Coatings Deposited on Two Geometrically Different Substrates written by Tshepo Paul Ntsoane and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, coatings of hydroxyapatite (HAp) prepared by thermal spraying technique are investigated for biological response. Spraying was done on two geometrically different Ti-6Al-4V alloy substrates under atmospheric conditions. Subsequent immersion experiments, mimicking physiological environment, were carried out using simulated body fluids (SBF). Non-destructive techniques utilizing conventional and high-energy synchrotron diffractometry were employed for depthaÌ22́Ơ0́−resolved investigations of phase composition, crystallinity and residual stresses within the coating for both substrate geometries. Microscopy techniques were used to examine surface morphology and microstructure. In both substrate geometries and for all immersion periods, HAp is the predominant phase with tetra-calcium phosphate (TTCP) and tri-calcium phosphate (TCP) the two main thermal products. The coating deposited on cylindrical rod substrate show a higher volume fraction of HAp at the near-surface region for the as-sprayed condition and samples immersed for 7 and 28 days. Further immersion shows the former decreasing gradually while the latter saturates after 28 days. Thermal products TTCP and TCP, for the coating deposited on the flat geometry substrate decreased with immersion, while those deposited on the cylindrical rod remains roughly the same before increasing slightly. Through-thickness behavior shows the as-sprayed HAp increasing almost linearly with depth, reaching a maximum around the coating midpoint before decreasing with further depth. Immersion in SBF does not alter the general trend across the coating however it increased the volume fraction of HAp within the first half of the coating with the biggest change occurring between 7 and 28-days of immersion. The variation of HAp with depth and immersion at the three lateral positions shows agreement within error bars indicating the coating to be homogenous. The trend is observed for coating deposited on cylindrical substrate geometry. Both substrate geometries show high near-surface region crystallinity with an index of ~90%. The interface region is less crystalline with a degree of crystallinity index of 67% and 56% for the flat and cylindrical substrates, respectively. Immersion in SBF does not alter the general through-thickness trend however it increased the degree of crystallinity at both ends. Residual stresses for the coating deposited on both substrate geometries are tensile and small, not exceeding 42 MPa and 65 MPa, respectively. The stresses are mainly confined in the near-surface region with the interior region showing neglible stresses,
Download or read book Advances in Calcium Phosphate Biomaterials written by Besim Ben-Nissan and published by Springer Science & Business. This book was released on 2014-04-17 with total page 559 pages. Available in PDF, EPUB and Kindle. Book excerpt: Advances in Calcium Phosphate Biomaterials presents a comprehensive, state-of-the-art review of the latest advances in developing calcium phosphate biomaterials and their applications in medicine. It covers the fundamental structures, synthesis methods, characterization methods, and the physical and chemical properties of calcium phosphate biomaterials, as well as the synthesis and properties of calcium phosphate-based biomaterials in regenerative medicine and their clinical applications. The book brings together these new concepts, mechanisms and methods in contributions by both young and “veteran” academics, clinicians, and researchers to forward the knowledge and expertise on calcium phosphate and related materials. Accordingly, the book not only covers the fundamentals but also open new avenues for meeting future challenges in research and clinical applications. Besim Ben-Nissan is a Professor of Chemistry and Forensic Science at the University of Technology, Sydney, Australia
Download or read book Tribological Behavior of Functional Surface written by Pawel Pawlus and published by MDPI. This book was released on 2021-08-31 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: Material loss due to wear and corrosion and high resistance to motion generate high costs. Therefore, minimizing friction and wear is a problem of great importance. This book is focused on the tribological behavior of functional surfaces. It contains information regarding the improvement of tribological properties of sliding elements via changes in surface topography. Tribological impacts of surface texturing depending on the creation of dimples on co-acting surfaces are also discussed. The effects of various coatings on the minimization of friction and wear and corrosion resistance are also studied. Friction can be also reduced by introducing a new oil.
Download or read book Tribological Behavior of Atmospheric Plasma Sprayed HA CNT Coatings of Biomaterials written by Mahesh M. Manohar Sonekar and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: A MWCNT-induced hydroxyapatite, air plasma spray coatings were produced on SS-316 L, CoCrMo, and Ti6Al4V alloys at varied weight percent ratios. The shape, thickness, adhesion, structure, and content of the APS-treated samples, as well as particle distribution, were studied using an X-ray diffraction, scanning electron microscope, Fourier transform infrared, and 3D-profilometer. The study looks at dry and wet unidirectional sliding wear behaviors, as well as the influence of incorporating carbon nanotubes in different weight percent to hydroxyapatite by plasma spraying on its tribological properties in physiological condition. In-vitro investigation was conducted in controlled environment to model complicated interactions among cells growth factors. Both CNT and HA particles were absorbed into the APS layers, as evidenced by the results. Crystallinity and volume percent with open porosity were substantially higher in the APS-CNT imposed HA coating than in the control. When compared to pure HA coating, the enhanced hardness ranged from 2.4 to 5.6 GPa, the modulus of elasticity ranged from 105 to 172 GPa, and the fracture toughness from 0.6 to 2.4¬†MPa.m1/2, with a reduced wear rate of 50.2 √ó 10,àí5¬†mm3 to 4.2 √ó 10,àí5¬†mm3¬†N,àí1¬†m,àí1. CNT addition has no negative effect on osteoblast proliferation and cell viability.
Download or read book Calcium Orthophosphates written by Sergey V. Dorozhkin and published by CRC Press. This book was released on 2012-06-04 with total page 863 pages. Available in PDF, EPUB and Kindle. Book excerpt: Due to a great chemical similarity with the biological calcified tissues, many calcium orthophosphates possess remarkable biocompatibility and bioactivity. Materials scientists use this property extensively to construct artificial bone grafts that are either entirely made of or only surface-coated with the biologically relevant calcium orthophospha
Download or read book Hydroxyapatite HAp for Biomedical Applications written by Michael Mucalo and published by Elsevier. This book was released on 2015-03-06 with total page 402 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydroxyapatite in the form of hydroxycarbonate apatite is the principal mineral component of bone tissue in mammals. In Bioceramics, it is classed as a bioactive material, which means bone tissue grows directly on it when placed in apposition without intervening fibrous tissue. Hydroxyapatite is hence commonly used as bone grafts, fillers and as coatings for metal implants. This important book provides an overview of the most recent research and developments involving hydroxyapatite as a key material in medicine and its application. Reviews the important properties of hydroxyapatite as a biomaterial Considers a range of specific forms of the material and their advantages Reviews a range of specific medical applications for this important material
Download or read book Hydroxyapatite Coatings for Biomedical Applications written by Sam Zhang and published by CRC Press. This book was released on 2013-05-14 with total page 473 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydroxyapatite coatings are of great importance in the biological and biomedical coatings fields, especially in the current era of nanotechnology and bioapplications. With a bonelike structure that promotes osseointegration, hydroxyapatite coating can be applied to otherwise bioinactive implants to make their surface bioactive, thus achieving faster healing and recovery. In addition to applications in orthopedic and dental implants, this coating can also be used in drug delivery. Hydroxyapatite Coatings for Biomedical Applications explores developments in the processing and property characterization and applications of hydroxyapatite to provide timely information for active researchers and newcomers alike. In eight carefully reviewed chapters, hydroxyapatite experts from the United States, Japan, Singapore, and China present the latest on topics ranging from deposition processes to biomedical applications in implants and drug delivery. This book discusses: Magnetron sputtering and electrochemical deposition The modification of hydroxyapatite properties by sol–gel deposition to incorporate other elements found in natural bones, such as zinc, magnesium, and fluorine The use of pure hydroxyapatite in drug delivery applications The growth or self-assembly of hydroxyapatite on shape memory alloy Hydroxyapatite composite coatings—with carbon nanotubes, titanium dioxide (TiO2), and others—on the titanium alloy Offering valuable insights and a wealth of data, including numerous tables and figures, this is a rich source of information for research on hydroxyapatite coatings. Each chapter also covers material that provides an accessible stepping stone for those who are new to the field.
Download or read book Hydroxyapatite written by Jagannathan Thirumalai and published by BoD – Books on Demand. This book was released on 2018-02-14 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: The goal of this book is to provide readers with a broad appraisal of topics in global advancements in theoretical and experimental facts, and practical applications of nano-HAp materials based on their synthesis, properties, prospects, and potential biomedical treatments. The perspective of this book involves the preparation of crystalline nano-HAP materials including preferential orientation, various properties and new prospects in biomimetics, bone tissue infections, biomedical implants, regenerative medicinal treatments and a wide range of technological applications. This book is categorized into two main sections: Hydroxyapatite: synthesis, properties, perspectives, and prospects; and the application of hydroxyapatite: a synergistic outlook. Individual chapters provide a base for a wide range of readers from diversified fields, including students and researchers, who will find in this book simply explained basics as well as advanced techniques of specific subjects related to these phenomena. The book is made up of nine contributions, compiled by experts from wide-ranging fields involved in biomaterials/materials in science and technology from over 15 research institutes across the globe.
Download or read book Thermal Spray 2006 written by Basil Richard Marple and published by ASM International. This book was released on 2006-01-01 with total page 395 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Assessment of Plasma sprayed Hydroxyapatite Coatings written by Mary Patricia Taylor and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Testing of Plasma Sprayed Hydroxyapatite Coatings written by Martin O'Driscoll and published by . This book was released on 1993 with total page 134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Coatings for Biomedical Applications written by Mike Driver and published by Elsevier. This book was released on 2012-02-22 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: The biomaterials sector is rapidly expanding and significant advances have been made in the technology of biomedical coatings and materials, which provide a means to improve the wear of joints, change the biological interaction between implant and host and combine the properties of various materials to improve device performance. Coatings for biomedical applications provides an extensive review of coating types and surface modifications for biomedical applications. The first part of the book explores a range of coating types and their biomedical applications. Chapters look at hydrophilic, mineral and pyrolytic carbon coatings in and ex vivo orthopaedic applications and finally at surface modification and preparation techniques. Part two presents case studies of orthopaedic and ophthalmic coatings, and biomedical applications including vascular stents, cardiopulomonary by-pass equipment and ventricular assist devices. With its clear structure and comprehensive review of research, Coatings for biomedical applications is a valuable resource to researchers, scientists and engineers in the biomedical industry. It will also benefit anyone studying or working within the biomedical sector, particularly those specialising in biomedical coatings. Provides an extensive review of coating types and surface modifications for biomedical applications Chapters look at hydrophilic coatings for biomedical applications in and ex vivo, mineral coatings for orthopaedic applications, pyrolytic carbon coating and other commonly-used biomedical coatings Presents case studies of orthopaedic and ophthalmic coatings, and biomedical applications including vascular stents, cardiopulomonary by-pass equipment and ventricular assist devices
