In situplasma fabrication of ceramic-like structure on polymeric implant with enhanced surface hardness, cytocompatibility and antibacterial capability

2016 ◽  
Vol 104 (5) ◽  
pp. 1102-1112 ◽  
Author(s):  
Jun Liu ◽  
Wei Zhang ◽  
Haigang Shi ◽  
Kun Yang ◽  
Gexia Wang ◽  
...  
Keyword(s):  
Surface Hardness ◽  
Polymeric Implant ◽  
Enhanced Surface

A Novel Approach for Metal Surface Modification

2007 ◽  
Vol 280-283 ◽  
pp. 1805-1806
Author(s):  
Zhi Jun Cao ◽  
Jia Chen Liu ◽  
Li Bin Liu ◽  
Hao Ye ◽  
Yan Qiu Wei
Keyword(s):  
Surface Modification ◽  
Wear Rate ◽  
Charge State ◽  
Metal Surface ◽  
Surface Hardness ◽  
Metallic Surface ◽  
New Approach ◽  
Novel Approach ◽  
Complex Shapes ◽  
Enhanced Surface

A new approach was developed for surface modification of metallic surface. By treating nano-zirconia particles and metal surface in different charge state, nano-zirconia particles can be dispersedly inlaid in metal surface owing to electrostatic and nanometer effects. By using this method, metal components of complex shapes, especially those having inside surfaces, might be easily improved, i.e., enhanced surface hardness and wear rate.

On the Microstructure and Erosion Corrosion Behavior of Laser Processed Nickel Aluminium Bronze

2020 ◽  
Vol 979 ◽  
pp. 157-161
Author(s):  
A.K. Lakshminarayanan ◽  
S.R. Koteswara Rao ◽  
K. Sridhar ◽  
A. Vignesh
Keyword(s):  
Corrosion Rate ◽  
Surface Hardness ◽  
Jet Impingement ◽  
Impact Angle ◽  
Fine Grain ◽  
Erosion Corrosion ◽  
Aluminium Bronze ◽  
Grain Formation ◽  
Processed Sample ◽  
Enhanced Surface

Slurry jet impingement test was carried out on a laser processed nickel aluminium bronze (NAB) and the results are compared with the as-cast NAB. It is observed that the invariably, erosion corrosion rate is increasing with the jet velocity. Also, as the slurry impact angle is increased, the erosion corrosion rate of laser processed and as-cast NAB decreased. The erosion corrosion rate of laser processed sample exhibited 28 % higher erosion resistance as compared to the as-cast NAB. Enhanced surface hardness and fine grain formation due to laser processed are the main reasons for the improvement in the erosion corrosion resistance.

Enhanced surface hardness by boron implantation in nitinol alloy

1996 ◽  
Vol 22 (10) ◽  
pp. 543-546 ◽  
Author(s):  
Deok-Hyung Lee ◽  
Byungwoo Park ◽  
Ashok Saxena ◽  
Thomas P. Serene
Keyword(s):  
Surface Hardness ◽  
Boron Implantation ◽  
Nitinol Alloy ◽  
Enhanced Surface

scholarly journals Effect of Precuring Warming on Mechanical Properties of Restorative Composites

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Kareem Nada ◽  
Omar El-Mowafy
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Room Temperature ◽  
Surface Hardness ◽  
Mean Value ◽  
Test Surface ◽  
Bulk Properties ◽  
Mean Values ◽  
Enhanced Surface ◽  
Diametral Tensile Strength

To investigate the effect of prepolymerization warming on composites' mechanical properties, three composites were evaluated: Clearfil Majesty (CM) (Kuraray), Z-100 (3M/ESPE), and Light-Core (LC) (Bisco). Specimens were prepared from each composite at room temperature as control and 2 higher temperatures (37∘Cand54∘C) to test surface hardness (SH), compressive strength (CS), and diametral tensile strength (DTS). Data were statistically analyzed using ANOVA and Fisher's LSD tests. Results revealed that prewarming CM and Z100 specimens significantly improved their SH mean values (P<0.05). Prewarming also improved mean CS values of Z100 specimens (P<0.05). Furthermore, DTS mean value of CM prepared at52∘was significantly higher than that of room temperature specimens (P<0.05). KHN, CS, and DTS mean values varied significantly among the three composites. In conclusion, Prewarming significantly enhanced surface hardness of 2 composites. Prewarming also improved bulk properties of the composites; however, this improvement was significant in only some of the tested materials.

Enhanced Surface Hardness by Boron Diffusion in Martensitic Stainless Steel via Cathodic Reduction and Thermal Diffusion Based Boriding (CRTD-Bor)

2015 ◽  
Vol 719-720 ◽  
pp. 25-28 ◽  
Author(s):  
G. Kartal Sireli ◽  
C. Yelkarasi ◽  
P. Ozkalafat ◽  
S. Timur ◽  
M. Urgen
Keyword(s):  
Thermal Diffusion ◽  
Single Phase ◽  
Surface Hardness ◽  
Boride Layer ◽  
Cathodic Reduction ◽  
Boron Diffusion ◽  
Cross Sectional ◽  
The Matrix ◽  
Enhanced Surface ◽  
Borided Steel

In this study, a developed new boriding method called as “Cathodic Reduction and Thermal Diffusion based Boriding” (CRTD-Bor) was applied to increase the surface hardness of 400 series steels. The cross-sectional examination of borided steel revealed that the boride layers consisted of single phase Fe2B. A dense and continuously 25μm thick Fe2B layer could be formed after 20 minutes of CRTD-Bor. The grown boride layer exhibited 1500±200 HV on top, and gradually decreased to the matrix (325 ± 25 HV).

Fabrication of a cubic zirconia nanocoating on a titanium dental implant with excellent adhesion, hardness and biocompatibility

RSC Advances ◽  
2016 ◽  
Vol 6 (64) ◽  
pp. 59030-59038 ◽  
Author(s):  
Indranee Das ◽  
Shreyasi Chattopadhyay ◽  
Arnab Mahato ◽  
Biswanath Kundu ◽  
Goutam De
Keyword(s):  
Dental Implant ◽  
Annealing Temperature ◽  
Surface Hardness ◽  
Dip Coating ◽  
Layer By Layer ◽  
Cubic Zirconia ◽  
Titanium Dental Implant ◽  
Oral Implant ◽  
Excellent Adhesion ◽  
Enhanced Surface

Crystalline cubic zirconia nanocoating on cpTi with enhanced surface hardness, durability and biocompatibility, useful as an advanced oral implant was fabricated by applying layer-by-layer dip-coating at low annealing temperature.

scholarly journals Enhanced surface hardness in nitrogen-implanted silicon carbide

1996 ◽  
Vol 118 (1-4) ◽  
pp. 693-697 ◽  
Author(s):  
C. Uslu ◽  
D.H. Lee ◽  
Y. Berta ◽  
B. Park ◽  
D.B. Poker ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Surface Hardness ◽  
Enhanced Surface

Optimisation of Pulsed Nd: YAG Laser Processing of Gray Cast Iron for Enhanced Surface Properties

2014 ◽  
Vol 1024 ◽  
pp. 215-218 ◽  
Author(s):  
Fazliana Fauzun ◽  
Syarifah Nur Aqida ◽  
Md Saidin Wahab ◽  
Wahab Saidin
Keyword(s):  
Surface Roughness ◽  
Cast Iron ◽  
Gray Cast Iron ◽  
Surface Hardness ◽  
Scanning Speed ◽  
Laser Surface ◽  
Gray Cast ◽  
Laser Surface Modification ◽  
Modified Surface ◽  
Enhanced Surface

This paper presents laser surface modification of gray cast iron for enhanced surface hardness properties. A 300 W high power Nd:YAG laser system with pulse mode was used to modify gray cast iron samples surface. Laser processing was conducted using a 33 full factorial design. Three controlled parameters were laser power, pulse duration and overlap percentage. The modified surface was characterised for metallographic study, roughness and hardness. Metallographic study and surface morphology were conducted using optical microscope while hardness properties were measured using Vickers scale. Surface roughness was measured using a 2D stylus profilometer. The results show that hardness of laser modified surface increased due to grain refinement. The overlapping rates increased significantly with decreasing laser scanning speed which affected sample surface integrity. Low surface roughness obtained at the highest scanning speed of 1400 mm/min, and low power of 830 W with pulse repetition frequency of 50 Hz. Process optimization was carried out for maximum surface hardness and laser modified depth, and minimum surface roughness. These findings indicate potential application of cast iron for high wear resistant applications through laser surface modification.

Low Temperature Thermochemical Surface Treatment of Austenitic Stainless Steel for Improved Mechanical and Tribological

2009 ◽  
Vol 83-86 ◽  
pp. 489-496 ◽  
Author(s):  
A. Triwiyanto ◽  
S. Mridha ◽  
E. Haruman
Keyword(s):  
Wear Resistance ◽  
Layer Structure ◽  
Surface Hardness ◽  
Austenitic Stainless Steels ◽  
High Hardness ◽  
High Wear Resistance ◽  
Fluidised Bed ◽  
Enhanced Surface ◽  
Effective Layer ◽  
Hardness Values

This paper describes the results of four thermochemical surface treatments of austenitic stainless steels carried out at 450oC in a fluidised bed furnace and they are nitriding, carburizing and the newly developed hybrid process involving the simultaneous and sequential incorporation of nitrogen and carbon to form a dual layer structure in order to achieve much enhanced surface hardness and wear resistance without compromising the corrosion resistance of the steel. In all these treatments there formed alloyed layers with a common feature of being precipitation-free and supersaturated with nitrogen, or carbon or both in the austenite lattice which is known as S Phase or expanded austenite. However the layer thickness was not uniform in any of these treatments and an effective layer was produced after 8h treatment duration. The nitriding treatment produced thicker and harder layer compared to other treatments; the maximum hardness was over 1500 Hv for nitriding and the minimum hardness of 500 Hv for carburizing treatment. The nitriding treatment sample gave high wear resistance which corresponded to high hardness values.

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