scholarly journals Microwave Plasmas as a Processing Tool for Tailoring the Surface Properties of Ceramic Coatings

2018 ◽  
Author(s):  
Emmanuel J. Ekoi ◽  
Muhammad Awais ◽  
Denis P. Dowling
Keyword(s):  
Surface Properties ◽  
Ceramic Coatings ◽  
Microwave Plasmas

Design of Experiment: A Statistical Approach to Understanding Factors Influencing Surface Properties of Sol-Gel Based Non-Stick Ceramic Coatings

2012 ◽  
Vol 622-623 ◽  
pp. 420-425
Author(s):  
Alex Kwasi Kumi ◽  
Allan Chelashaw ◽  
Yu Mei Zhang ◽  
Li Feng Li
Keyword(s):  
Contact Angle ◽  
Surface Properties ◽  
Coupling Agent ◽  
Silane Coupling Agent ◽  
Sol Gel ◽  
Ceramic Coatings ◽  
Curing Temperature ◽  
Factors Influencing ◽  
Silane Coupling ◽  
Advancing Contact Angle

Ceramic coatings based on sol-gel method have increasingly gained much attention in recent times. In order to ascertain important experimental factors (variables) influencing surface properties, such as adhesion, pencil hardness and advancing contact angle (non-stick) of sol coatings, a 26-1-factorial screening design with six experimental variables, precursor mole ratio, low surface energy polymer concentration, silane coupling agent (SCA) concentration, silica nanoparticles concentration (SNP’s),curing temperature and three responses ( surface properties) were investigated. The results indicate that silane coupling agent concentration, SNP’s concentration and their interaction were the most significant experimental factors influencing advancing contact angle. None of the experimental factors studied were statistically significant with respect to hardness and adhesion.

scholarly journals Gas-Discharge Plasma-Assisted Functionalization of Titanium Implant Surfaces

2010 ◽  
Vol 638-642 ◽  
pp. 700-705 ◽  
Author(s):  
Karsten Schröder ◽  
Birgit Finke ◽  
Martin Polak ◽  
Frank Lüthen ◽  
Barbara Nebe ◽  
...  
Keyword(s):  
Surface Properties ◽  
Titanium Surface ◽  
Copper Ions ◽  
Antimicrobial Properties ◽  
Ceramic Coatings ◽  
Plasma Polymer ◽  
Adhesive Properties ◽  
Cell Adhesive

A crucial factor for in-growth of metallic implants in the bone stock is the rapid cellular acceptance whilst prevention of bacterial adhesion on the surface. Such contradictorily adhesion events could be triggered by surface properties. There already exists fundamental knowledge about the influence of physicochemical surface properties like roughness, titanium dioxide modifications, cleanness, and (mainly ceramic) coatings on cell and microbial behavior in vitro and in vivo. The titanium surface can be equipped with antimicrobial properties by plasma-based copper implantation, which allows the release and generation of small concentrations of copper ions during contact with water-based biological liquids. Additionally, the titanium surface was equipped with amino groups by the deposition of an ultrathin plasma polymer. This coating on the one hand does not significantly reduce the generation of copper ions, and on the other hand improves the adhesion and spreading of osteoblast cells. The process development was accompanied by physicochemical surface analyses like XPS, FTIR, contact angle, SEM, and AFM. Very thin modified layers were created, which are resistant to hydrolysis and delamination. These titanium surface functionalizations were found to have either an antimicrobial activity or cell-adhesive properties. Intramuscular implantation of titanium samples coated with the cell-adhesive plasma polymer in rats revealed a reduced inflammation reaction compared to uncoated titanium.

Characterization of Ceramic Coatings on ZL114 Aluminum Alloy Prepared in Alkaline Electrolyte Adding Nano-Al2O3 by Micro-Arc Oxidation

2011 ◽  
Vol 418-420 ◽  
pp. 804-807 ◽  
Author(s):  
Jun Zhao ◽  
Jian Jun Xi
Keyword(s):  
Aluminum Alloy ◽  
Surface Properties ◽  
Alkaline Solution ◽  
Ceramic Coatings ◽  
Alkaline Electrolyte ◽  
Corrosion Performance ◽  
Micro Arc Oxidation

ZL114 aluminum alloy samples were treated by micro-arc oxidation using alkaline solution added different amount of nano-Al2O3to improve the surface properties. Effects of the additives were investigated by thickness, hardness, morphologies and corrosion performance. The results indicated that proper amount of nano-Al2O3had certain contribution with higher corrosion performance. And adding too much nano-Al2O3decreased the property of ceramic coatings.

Surface properties of sol–gel-based fluorine-containing ceramic coatings

2018 ◽  
Vol 87 (1) ◽  
pp. 113-124
Author(s):  
Mustafa Hulusi Uğur ◽  
Emrah Çakmakҫı ◽  
Atilla Güngör ◽  
Nilhan Kayaman-Apohan
Keyword(s):  
Surface Properties ◽  
Sol Gel ◽  
Ceramic Coatings

Characterisation and In Vitro Bioactivity of UV-Treated Anodised Titanium

2015 ◽  
Vol 1125 ◽  
pp. 450-454
Author(s):  
Te Chuan Lee ◽  
M.F.M. Rathi ◽  
M.Y.Z. Abidin ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris
Keyword(s):  
Surface Properties ◽  
Uv Light ◽  
Treatment Method ◽  
Ceramic Coatings ◽  
Light Treatment ◽  
Disodium Salt ◽  
X Ray ◽  
Ceramic Films ◽  
Titanium Foils

Anodic oxidation is an electrochemical method for the production of ceramic films on a metallic substrate. It has been widely used to deposit the ceramic coatings on the metals surface. Recently, ultraviolet (UV) light treatment is gaining recognition as a new potential surface treatment method. This study aims to investigate the effect of UV light treatment on the surface properties and in vitro bioactivity of anodised titanium. At first, the titanium foils were anodised in mixture of β-glycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA). Subsequently, the anodised titanium was pre-treated with UVA lamp (peak wavelength of 365 nm) and immersed in simulated body fluid (SBF). Field emission scanning electron microscopy (FESEM), X-ray diffractometer (XRD) and goniometer were used to characterise the surface properties, crystallinity and surface wettability of untreated titanium (UT), anodised titanium (AT) and UV-treated anodised titanium (UTAT). UTAT became more hydrophilic if compared to the UAT. The result of SBF showed that bone-like apatite was precipitated on the surface of UTAT. The results indicated that hydrophilic surface is able to accelerate the growth of bone-like apatite.

Effect of Bath Temperature on Surface Properties of Anodised Titanium for Biomedical Application

2016 ◽  
Vol 840 ◽  
pp. 175-179 ◽  
Author(s):  
Te Chuan Lee ◽  
Mohd Hafifi Hafizat Mazlan ◽  
Mohamad Imran Abbas ◽  
Hasan Zuhudi Abdullah ◽  
Maizlinda Izwana Idris
Keyword(s):  
Surface Properties ◽  
Biomedical Application ◽  
Bath Temperature ◽  
Ceramic Coatings ◽  
Disodium Salt ◽  
Calcium Acetate ◽  
Titanium Foil ◽  
Acetate Monohydrate ◽  
X Ray ◽  
Glancing Angle

Anodic oxidation is an electrochemical method to deposit ceramic coatings on the metals substrate to improve the bioactivity. This study aims to investigate the effect of bath temperature on the surface properties of anodised titanium. High-purity titanium foil was modified by anodising in mixture of β-glycerophosphate disodium salt pentahydrate (β-GP) and calcium acetate monohydrate (CA). The experiments were carried out at 350 V, 30 mA.cm-2 for 10 minutes at different bath temperature (4-100 °C). Field emission scanning electron microscopy (FESEM), glancing angle X-ray diffractometer (GAXRD) and goniometer were used to characterise the surface morphology, mineralogy and wettability of anodised titanium, respectively. The results showed that porosity and crystallinity of surface decreased as increasing of bath temperature. Interestedly, the α-tricalcium phosphate (α-TCP) was deposited on the samples which anodisation at higher bath temperature (≥ 60 °C) and resulted high hydrophilicity behaviour even the surface was found relatively smooth.

scholarly journals Ceramics Coated Metallic Materials: Methods, Properties and Applications

2020 ◽  
Author(s):  
Dongmian Zang ◽  
Xiaowei Xun
Keyword(s):  
Surface Properties ◽  
Surface Coating ◽  
Ceramic Coatings ◽  
Bulk Materials ◽  
Water Separation ◽  
Surface Functionality ◽  
Coated Metal ◽  
Oil Water Separation ◽  
Oil Water ◽  
Metal Materials

Surface coating can allow the bulk materials to remain unchanged, while the surface functionality is engineered to afford a more wanted characteristic. Ceramic coatings are considered as ideal coatings on metal which can significantly improve the surface properties of metal materials including anti-fouling, self-cleaning, corrosion resistance, wear resistance, oil/water separation and biocompatibility. Furthermore, various techniques have been utilized to fabricate a range of different ceramic coatings with more desirable properties on metal materials, which make the materials widely used in service environment. This chapter focus will be on the types, fabrication methods, surface properties and applications of ceramics coated metal materials.

Potential Solutions to Increase the Corrosion Resistance of Metallic Surgical Instruments Using Different Types of Ceramic Coatings

2014 ◽  
Vol 614 ◽  
pp. 206-211 ◽  
Author(s):  
Ionescu Razvan ◽  
Iulian Vasile Antoniac ◽  
Mihai Cosmin Cotrut ◽  
Florin Miculescu ◽  
Vasile Eugeniu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Surface Properties ◽  
Protective Coatings ◽  
Physiological Saline ◽  
Medical Personnel ◽  
Ceramic Coatings ◽  
Surgical Instruments ◽  
Medical Instrumentation ◽  
Specific Method ◽  
Coating Materials

The overwhelming majority of medical instrumentation are executed form metalic materials, form the category of austenitic steinlees steel and titan alloys, which poses a good rezistance to corrosion, appropriate mechanical properties, and a good biocompatibility. The lifetime for the medical instrumentation is generaly low due to the modification of surface properties of metal tools from poor maintenance by medical personnel performing decontamination and sterilization operations (having no knowledge of material science), or the the improper use of chemical reagents or low quality of water used in decontamination processes. Identified solutions to improve surface properties of these parts of surgical instruments made ​​of metallic consist of deposition of protective coatings. In this experimental study, we perform different coatings on a substrate made by stainless steel type 316L. We use different coating materials, each deposited ​​by a specific method: hard ceramic biomaterials (TiO2 and YSZ - yttria stabilized zirconia) deposited by the method of deposition and plasma, respectively zirconium carbonitride (mono and multilayer) deposited by cathodic arc deposition method. The obtained coatings was analyzed using scanning electron microscopy coupled with EDS in order to characterize the morphology and composition of the coatings. The selected samples were tested for corrosion resistance. Corrosion resistance was determined by linear polarization technique, which involves plotting the potentiodynamic polarization curves of-1 V (vs. OC) to 1 V (vs SCE), with a scan rate of 0.5 mV / s. The corrosion tests was performed in physiological saline infusion (NaCl concentration 7%) at room temperature (25 ± 1 ° C) according to ASTM G15-97a. As a general conclusion we can say that layers ZrCN based presents the best parameter values ​​of corrosion and therefore the best corrosion resistance in the case of surgical instruments.

Electron microscopy studies of plasma-sprayed materials

1983 ◽  
Vol 41 ◽  
pp. 70-71
Author(s):  
K.R. Subramanian ◽  
A.H. King ◽  
H. Herman
Keyword(s):  
Plasma Spraying ◽  
Substrate Surface ◽  
Flame Temperature ◽  
Ceramic Coatings ◽  
Metallic Substrates ◽  
Hot Plasma ◽  
Almost All ◽  
Plasma Sprayed ◽  
Hostile Environments ◽  
Plasma Spraying Process

Plasma spraying is a technique which is used to apply coatings to metallic substrates for a variety of purposes, including hardfacing, corrosion resistance and thermal barrier applications. Almost all of the applications of this somewhat esoteric fabrication technique involve materials in hostile environments and the integrity of the coatings is of paramount importance: the effects of process variables on such properties as adhesive strength, cohesive strength and hardness of the substrate/coating system, however, are poorly understood.Briefly, the plasma spraying process involves forming a hot plasma jet with a maximum flame temperature of approximately 20,000K and a gas velocity of about 40m/s. Into this jet the coating material is injected, in powder form, so it is heated and projected at the substrate surface. Relatively thick metallic or ceramic coatings may be speedily built up using this technique.

Biological and Surface Properties of C-Type Virus Particles Produced by Novikoff Ascites Hepatoma Cells

1977 ◽  
Vol 35 ◽  
pp. 388-389
Author(s):  
D.C. Hixson ◽  
J.C. Chan ◽  
J.M. Bowen ◽  
E.F. Walborg
Keyword(s):  
Surface Properties ◽  
Ricinus Communis ◽  
Rat Kidney ◽  
Leukemia Virus ◽  
Viral Envelope ◽  
Virus Particles ◽  
Chemically Induced ◽  
Sarcoma Virus ◽  
Hepatocarcinoma Cells ◽  
Type C

Several years ago Karasaki (1) reported the production of type C virus particles by Novikoff ascites hepatocarcinoma cells. More recently, Weinstein (2) has reported the presence of type C virus particles in cell cultures derived from transplantable and primary hepatocellular carcinomas. To date, the biological function of these virus and their significance in chemically induced hepatocarcinogenesis are unknown. The present studies were initiated to determine a possible role for type C virus particles in chemically induced hepatocarcinogenesis. This communication describes results of studies on the biological and surface properties of type C virus associated with Novikoff hepatocarcinoma cells.Ecotropic and xenotropic murine leukemia virus (MuLV) activity in ascitic fluid of Novikoff tumor-bearing rats was assayed in murine sarcoma virus transformed S+L- mouse cells and S+L- mink cells, respectively. The presence of sarcoma virus activity was assayed in non-virus-producing normal rat kidney (NRK) cells. Ferritin conjugates of concanavalin A (Fer-Con wheat germ agglutinin (Fer-WGA), and Ricinus communis agglutinins I and II (Fer-RCAI and Fer-RCAII) were used to probe the structure and topography of saccharide determinants present on the viral envelope.

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