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adhesion-strengths
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Coating Nano Composite HAp-Al2O3-TiO2 on Stainless Steel 316 by Sol-Gel Method
, M.Sc. Thesis Sharif University of Technology ; Afshar, Abdollah (Supervisor)
Abstract
316L stainless steel is used in implants under load in orthopedics and dentistry due to its high strength and corrosion resistance. Therefore, to improve their biocompatibility properties, bioceramic coatings with more suitable biocompatibility properties are used. Therefore, in the present study, to improve the biocompatibility and corrosion properties on 316 L metal implants, HAp / TiO2 / Al2O3 nanocomposite coating was created using the cost-effective sol-gel method. Titanium + alumina by weight percentage in these coatings were 20, 30, and 40% by weight. In this study, FTIR, XRD, DSC / TG, FE-SEM EDS, DLS tests were performed to investigate the chemical bases in nanocomposites,...
Mechanical properties of martensitic stainless steel weld/adhesive hybrid bonds
, Article Science and Technology of Welding and Joining ; Volume 23, Issue 3 , 2018 , Pages 227-233 ; 13621718 (ISSN) ; Safikhani, E ; Sharif University of Technology
Taylor and Francis Ltd
2018
Abstract
Hybrid weld-adhesive bonding (AB) was used as an approach to improve the mechanical properties of martensitic stainless steel resistance spot welds. The weld fusion zone in both techniques was composed of predominantly martensite and δ-ferrite. It was found that the presence of adhesive does not induce excess hardening effect in the fusion zone. It was shown that hybrid AB/resistance spot welding) i.e. weld-bonding) technique can double the peak load and energy absorption of the joints compared to those of the resistance spot welds. To obtain high performance weld-bonded joints, heat generation during welding should be controlled to produce weld bonds with large fusion zone size, but without...
Improved adhesion of NiTi wire to silicone matrix for smart composite medical applications
, Article Materials and Design ; Volume 30, Issue 9 , 2009 , Pages 3667-3672 ; 02641275 (ISSN) ; Hassanzadeh Nemati, N ; Bagheri, R ; Sharif University of Technology
2009
Abstract
Recent uses of intelligent composites in biomedical appliances aggrandize the necessity of bonding-strength improvement in NiTi/silicone matrix interface. SEM micrographs and pull-out tests are employed to determine the strength of the NiTi/silicone bonds in a flexible composite piece. Greater adhesion strengths are obtained due to the presence of thin oxide layer, surface roughness and frictional forces between the embedded-wires and the contacting phase. Effect of curing treatment on phase transformation temperatures of the wires is determined by electrical resistivity (ER) measurements. Results show that the curing treatment shifts the transition points of the wires towards higher...
Adhesive and cohesive properties by indentation method of plasma-sprayed hydroxyapatite coatings
, Article Applied Surface Science ; Volume 253, Issue 11 , 2007 , Pages 4960-4965 ; 01694332 (ISSN) ; Ziaei Moayyed, A. A ; Mesgar, A. S. M ; Sharif University of Technology
Elsevier
2007
Abstract
Adhesive and cohesive properties of the plasma-sprayed hydroxyapatite (HA) coatings, deposited on Ti-6Al-4V substrates by varying the plasma power level and spray distance (SD), were evaluated by an indentation method. The crystallinity and the porosity decreased with increasing both of these two parameters. The microhardness value, Young's modulus (E) and coating fracture toughness (K C ) were found to increase with a combinational increase in spray power and SD. The Knoop and Vickers indentation methods were used to estimate E and K C , respectively. The critical point at which no crack appears at the interface was determined by the interface indentation test. This was used to define the...