Electrophoretic Deposition of Gelatin/Hydroxyapatite Composite Coatings onto a Stainless Steel Substrate

2015 ◽  
Vol 654 ◽  
pp. 195-199 ◽  
Author(s):  
Františka Frajkorová ◽  
Esther Molero ◽  
Begoña Ferrari
Keyword(s):  
Tissue Engineering ◽  
Stainless Steel ◽  
Electrophoretic Deposition ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Deposition Efficiency ◽  
Dip Coating ◽  
Gelling Temperature ◽  
Thermal Gelation

Biodegradable polymers and bioactive ceramics are being combined in a variety of novel materials for tissue engineering scaffolds. These composite systems, which combine the useful mechanical properties of polymers with the bioactivity of ceramics, seem to be a promising choice for bone tissue engineering. In recent years, the use of biopolymers that gelate on cooling has received a lot of attention with regards to the production of laminates and coatings. In this work, we report the incorporation of hydroxyapatite (HA) into a gelatin coating on stainless steel substrate using colloidal processing technology. A titania (Ti) buffer layer prepared by dip coating was inserted to improve the bonding strength between the HA/gelatin layer and stainless steel substrate. The suspensions, composed of 1 vol% of HA and three different additions of gelatin, were formulated with a focus on rheological properties for codeposition of both phases by electrophoretic deposition (EPD). The composite coatings performed by EPD were investigated in terms of deposition efficiency and kinetics over different deposition times. The EPD process was performed at both ambient temperature and the gelling temperature of the suspension. While at room temperature no electrophoretic growth of the layers was observed, the thermal gelation of gelatin promotes the growth of a homogeneous, well-adherent coating.

scholarly journals Effects of WC Particle Types on the Microstructures and Properties of WC-Reinforced Ni60 Composite Coatings Produced by Laser Cladding

Metals ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 583 ◽  
Author(s):  
Pengxian Zhang ◽  
Yibin Pang ◽  
Mingwei Yu
Keyword(s):  
Stainless Steel ◽  
Uniform Distribution ◽  
Laser Cladding ◽  
Steel Surface ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Composite Coatings ◽  
304 Stainless Steel ◽  
Stainless Steel Surface ◽  
Different Types

WC-reinforced Ni60 composite coatings with different types of WC particles were prepared on 304 stainless steel surface by laser cladding. The influences of spherical WC, shaped WC, and flocculent WC on the microstructures and properties of composite coatings were investigated. The results showed that three types of WC particles distribute differently in the cladding coatings, with spherical WC particles stacking at the bottom, shaped WC aggregating at middle and lower parts, with flocculent WC particles dispersing homogeneously. The hardnesses, wear resistances, corrosion resistances, and thermal shock resistances of the coatings are significantly improved compared with the stainless steel substrate, regardless of the type of WC that is added, and especially with regard to the microhardness of the cladding coating; the addition of spherical or shaped WC particles can be up to 2000 HV0.05 in some areas. Flocculent WC, shaped WC, and spherical WC demonstrate large to small improvements in that order. From the results mentioned above, the addition of flocculent WC can produce a cladding coating with a uniform distribution of WC that is of higher quality compared with those from spherical WC and shaped WC.

Tantalum Based High-Pressure Cold Spray Coatings on Stainless Steel Substrate

2019 ◽  
Vol 813 ◽  
pp. 429-434
Author(s):  
Jagannadh V.S.N. Sripada ◽  
Megil F. Gallant ◽  
Gobinda C. Saha ◽  
Reeti Singh ◽  
Jan Kondas
Keyword(s):  
High Pressure ◽  
Stainless Steel ◽  
Cold Spray ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Transition Element ◽  
Spray Coating ◽  
Deposition Efficiency ◽  
High Heat ◽  
Inlet Temperature

Tantalum as a transition element possesses good corrosion resistant properties, along with ductility and hardness. It is also one of the best heat-resistant material (melting point 2996°C) and is known for its high heat and electrical conductivity. In this research, Tantalum is deposited on stainless steel substrate using high-pressure cold spray (HPCS) method. Cold spray coating technology enables the deposition of powder feedstock without melting. Feedstock particles are propelled through a nozzle at supersonic velocities and they deform plastically on impact, resulting in good bonding strength to the substrate. The low temperature and solid-state deposition associated with cold spray allows refractory materials such as Ta, Mo, and W to be deposited without high temperature requirements. The objective of this work is to achieve a dense and nonporous coating microstructure with a high deposition efficiency. The hardness of as-received tantalum particles is found to be 279 HV0.3 and the microstructure is very dense. Tensile testing carried on the sample coated at a stagnation gas pressure of 50 bar and gas inlet temperature of 900°C exhibited an ultimate tensile strength of 442 MPa and adhesion strength of 77 MPa. Further mechanical properties of the coating in terms of hardness is carried out by nanoindentation. These results will be correlated with microstructural imaging and elemental analysis including morphology and composition using scanning electron microscopy and X-ray diffraction techniques.

scholarly journals Electrophoretic Deposition of Graphene Oxide on Stainless Steel Substrate

Nanomaterials ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1779
Author(s):  
Dominika Marcin Behunová ◽  
George Gallios ◽  
Vladimír Girman ◽  
Hristo Kolev ◽  
Mária Kaňuchová ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Stainless Steel ◽  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Photoelectron Spectroscopy ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Environmental Application ◽  
Transmission Electron ◽  
Pre Treatment

We demonstrated the deposition of the architecture of graphene oxide on stainless steel substrate and its potential environmental application. The synthesis and characterization of graphene oxide were described. The controlled formation of graphene oxide coatings in the form of the homogenous structure on stainless steel is demonstrated by scanning electron microscopy (SEM). The structure, morphology and properties of the material were assessed by Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, transmission electron microscopy (TEM) and atomic force microscopy (AFM). The morphology and stability of these structures are shown to be particularly related to the pre-treatment of stainless steel substrate before the electrophoretic deposition. This approach opens up a new route to the facile fabrication of advanced electrode coatings with potential use in environmental applications.

scholarly journals Synthesis, morpho-structural characterization and electrophoretic deposition of aegirine obtained by the hydrothermal method in the Si-Fe-Na-H2O system

2015 ◽  
Vol 13 (1) ◽  
pp. 51-58
Author(s):  
Marjan Randjelovic
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Stainless Steel ◽  
Electrophoretic Deposition ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Hydrothermal Process ◽  
Efficient Procedure ◽  
Selection Of ◽  
Scanning Electron

Aegirine belongs to a group of minerals known as inosilicates. In this study, a fast and efficient procedure is proposed for the synthesis of aegirine nanoparticles by means of the hydrothermal process, starting from a suspension of simple hydroxide/silicate precursors. Structural properties of the obtained mineral were assessed by the XRD technique. It was found that aegirine was the only crystalline phase present. The expected needle-like morphology, characteristic of inosilicates, was confirmed by scanning electron microscopy (SEM). Through an appropriate selection of solvents and dispersants, an electrophoretic deposition and immobilization of aegirine on stainless steel was achieved. Native layers of aegirine displayed a very smooth morphology, while after calcination, a detachment of the layers from the stainless steel substrate and the appearance of cracks in the coating was observed. This phenomenon could be prevented by the use of appropriate additives.

scholarly journals Evaluation of Surface Roughness of 316L Stainless Steel Substrate on Nanohydroxyapatite by Electrophoretic Deposition

2018 ◽  
Vol 21 (1) ◽  
pp. 28 ◽  
Author(s):  
Mohammed Jasim Kadhim ◽  
Nawal Ezzat Abdulateef ◽  
Makarim Hazim Abdulkareem
Keyword(s):  
Stainless Steel ◽  
Electrophoretic Deposition ◽  
316L Stainless Steel ◽  
Ph Value ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Nano Particles ◽  
Substrate Roughness ◽  
Force Microscopy ◽  
Emery Paper

The present work was designed on producing nanohydroxyapatite layers using electrophoretic deposition (EPD) on 316L stainless steel substrate.  The EPD coatings were prepared by the deposition of hydroxyapatite (HA)-chitosan nanocomposites on different substrate roughness (polish surface, 220 grit SiC grind, and sand blast surfaces).  Depositions were performed using the suspensions of HA nano particles (3 g/L) in the mixture of alcohol and distilled water (ethanol, 5 vol. %water and containing 0.5 g/L of chitosan dissolved in 1 vol.% acetic acid.  Coatings were achieved on the cathode at constant voltage, time and temperature (90 V, 5 min and 40 °C respectively); the  pH value was performed and fitted at 4.  After deposition, the coated samples were dried at room temperature for 24 h.  The surface topography of coatings was analyzed using atomic force microscopy (AFM).  SEM was used to postulate both the surface and the cross section morphology of the coatings.  The adhesion bonding between the deposited coatings and substrate were measured using tape tester to evaluate the adhesion bonding between the coating and substrate.  The results showed the deposited coatings on sand blasted substrate has less porosity compared with the polish surface and 220 emery paper SiC grinding substrate respectively.  The coating on the sand blasted substrate showed higher nanoroughness (122 nm), better adhesion bonding (removal area 15%) and higher thickness layer (12 µm) than that of the polish substrate and 220 emery paper SiC grinding substrate.

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