Convection-Diffusion Layer in an “Open Space” for Local Surface Treatment and Microfabrication using a Four-Aperture Microchemical Pen

The features of the structure formation of diffusion layers obtained by technology, including preliminary surface treatment of steel products made of U8 steel and subsequent boriding in powder media, have been investigated. The pretreatment consisted of dynamic alloying in the superdeep penetration (SDP) mode with a SiC-based powder composition. As a result, the thickness of the diffusion layer increases, its porosity decreases, and the proportion of the high-boron FeB phase in the layer increases.

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2308 Improvement of Wear Resistance of Stainless Steel by Laser-Induced Local Surface Treatment

Proceedings of International Conference on Leading Edge Manufacturing in 21st century LEM21 ◽

10.1299/jsmelem.2015.8._2308-1_ ◽

2015 ◽

Vol 2015.8 (0) ◽

pp. _2308-1_-_2308-6_

Author(s):

Atsushi EZURA ◽

Hikaru YOSHIMINE ◽

Koki OHKAWA ◽

Kazutoshi KATAHIRA ◽

Jun KOMOTORI

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Surface Treatment ◽

Local Surface

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Application of Shot Peening and Shot Blasting to Increase Hardness and Depth of Nitride Hardened Layer to the Modified H13 Steel as Die Casting Die Materials

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.789.313 ◽

2013 ◽

Vol 789 ◽

pp. 313-319 ◽

Cited By ~ 1

Author(s):

Myrna Ariati ◽

Rizki Aldila

Keyword(s):

Surface Treatment ◽

Diffusion Layer ◽

Shot Peening ◽

White Layer ◽

Die Casting ◽

Surface Hardness ◽

Vacuum Furnace ◽

Shot Blasting ◽

Forming Process ◽

Effective Depth

In metal forming process by die casting method, nitriding plays an important role in increasing the surface hardness. The influence of shot peening and shot blasting to the modified. H13 tool steel before nitriding process has been studied. Nitriding has been done in a gas vacuum furnace, at temperature of 510°C for 5 hours. Shot peening was conducted by using steel balls with a pressure of 461 kPa. Shot blasting has been done after shot peening using SiC particles. Characterization of the sample surface before and after the variation process is focused on changing the microstructure, micro hardness distribution, depth and composition nitriding layer. It has been found that shot peening prior to nitriding increase the maximum surface hardness to 1196 HV and effective depth of diffusion layer to 72 μm. Meanwhile, the nitriding without any prior surface treatment produces a maximum hardness of HV 1101.4 with effective depth of diffusion layer of 54 μm. Shot peening prior to nitriding produces white layer thickness of 4.1 μm thicker compared to white layer developed in nitriding without shot peening which produces 3.7 μm. While on nitrided material without any preceded surface treatment did not reveal any white surface layer.

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Improvement in wear resistance of stainless steel by laser-induced local surface treatment

Journal of Advanced Mechanical Design Systems and Manufacturing ◽

10.1299/jamdsm.2016jamdsm0079 ◽

2016 ◽

Vol 10 (5) ◽

pp. JAMDSM0079-JAMDSM0079 ◽

Cited By ~ 3

Author(s):

Atsushi EZURA ◽

Hikaru YOSHIMINE ◽

Koki OHKAWA ◽

Kazutoshi KATAHIRA ◽

Jun KOMOTORI

Keyword(s):

Stainless Steel ◽

Wear Resistance ◽

Surface Treatment ◽

Local Surface

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Development of high-performance objective lens polepiece for ultrahigh resolution Analytical Electron Microscope

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100147119 ◽

1993 ◽

Vol 51 ◽

pp. 254-255

Author(s):

K. Fukushima ◽

T. Kaneyama ◽

F. Hosokawa ◽

H. Tsuno ◽

T. Honda ◽

...

Keyword(s):

Electron Microscope ◽

High Performance ◽

Open Space ◽

Materials Science ◽

Objective Lens ◽

Ultrahigh Resolution ◽

Science Field ◽

Specimen Holder ◽

Analytical Electron ◽

Analytical Electron Microscope

Recently, in the materials science field, the ultrahigh resolution analytical electron microscope (UHRAEM) has become a very important instrument to study extremely fine areas of the specimen. The requirements related to the performance of the UHRAEM are becoming gradually severer. Some basic characteristic features required of an objective lens are as follows, and the practical performance of the UHRAEM should be judged by totally evaluating them.1) Ultrahigh resolution to resolve ultrafine structure by atomic-level observation.2) Nanometer probe analysis to analyse the constituent elements in nm-areas of the specimen.3) Better performance of x-ray detection for EDS analysis, that is, higher take-off angle and larger detection solid angle.4) Higher specimen tilting angle to adjust the specimen orientation.To attain these requirements simultaneously, the objective lens polepiece must have smaller spherical and chromatic aberration coefficients and must keep enough open space around the specimen holder in it.

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Pictorial Reliefs as Organized Local Surface Shapes

PsycEXTRA Dataset ◽

10.1037/e633262013-128 ◽

2013 ◽

Cited By ~ 1

Author(s):

Johan Wagemans ◽

Andrea Van Doorn ◽

Jan Koenderink

Keyword(s):

Local Surface

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Maximum Principle in Finite Element Models for Convection-Diffusion Phenomena

10.1016/s0304-0208(08)x7173-7 ◽

1983 ◽

Keyword(s):

Finite Element ◽

Maximum Principle ◽

Finite Element Models ◽

Convection Diffusion ◽

Diffusion Phenomena

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Surface treatment with silver particles isles on Titanium cp: study of antimicrobial activity

Research Society and Development ◽

10.33448/rsd-v9i4.2662 ◽

2020 ◽

Vol 9 (4) ◽

pp. e27942662

Author(s):

Patrícia Capellato ◽

Cláudia Eliana Bruno Marino ◽

Gilbert Silva ◽

Lucas Victor Benjamim Vasconcelos ◽

Rodrigo Perito Cardoso ◽

...

Keyword(s):

Antimicrobial Activity ◽

Surface Treatment ◽

Titanium Surface ◽

Silver Clusters ◽

Silver Particles ◽

Silver Deposition ◽

Dispersed Particles ◽

Significant Difference ◽

Diffusion Assay ◽

Antibacterial Potential

During the last decades, researchers have been growing the interest in surface treatment with an antimicrobial agent. Silver nanoparticles (AgNPs) are widely used in biomedical fields due to their potent antimicrobial activity. So, in this study was investigated silver particles (isles) coated on titanium surface for dental and orthopedic application. Silver particles coating process on titanium surface were performed via sputtering that is a plasma-assisted deposition technique with and titanium without treatment was applied as comparing standard. Plasma treatment parameters were optimized so that the result was not a thin film of Ag but dispersed particles of Ag on the Ti-cp surface. The alloy surfaces were investigated using scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). In order to investigate antibacterial potential Staphylococcus aureus and Escherichia coli have been used at Agar diffusion assay. The results were analyzed by analysis of variance (ANOVA) in order to verify significant difference antimicrobial activity between samples that have shown no difference between the surfaces studied treatments. For silver deposition scattered particles (isles) over titanium surface for a 10-minute treatment, EDS revealed by silver clusters that the particles were not properly scattered onto surface, hence, the low effectiveness in antibacterial activity.

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