scholarly journals Study on sputtering yield of tungsten with different particle sizes: Surface roughness dependence

2021 ◽  
Author(s):  
Tae Hyun Kwon ◽  
Sangjune Park ◽  
Jeong Min Ha ◽  
Young-Sang Youn
Keyword(s):  
Surface Roughness ◽  
Particle Sizes ◽  
Sputtering Yield

The Research on Deep and Narrow Groove Grinded by Diamond Wheel

2013 ◽  
Vol 389 ◽  
pp. 281-283 ◽  
Author(s):  
Chun Yang Tang ◽  
Long Wu ◽  
Zhi Long Li ◽  
Hua Feng Lu ◽  
Hua Yang ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Diamond Wheel ◽  
Grinding Wheel ◽  
Particle Sizes ◽  
Deep Trench ◽  
Fine Particle Size ◽  
Vitrified Bond ◽  
Flatness Error ◽  
Deep Narrow Groove ◽  
Selection Of

The deep narrow groove of the coupling plate and side with WC-CO coating was grinded by diamond wheel with metal bond and vitrified bond. The side of the deep trench flatness error was less than 0.02 mm, the bottom of the tank around the corner radius was less than 0.3mm. The type of porosity, particle sizes, surface roughness were measured by experiments, the data for the selection of the grinding wheel bond varieties. The experimental results show that grinding wheel with vitrified bond was suitable for parts of small coating porosity, fine particle size, surface roughness, and others were suitable for the grinding wheel with metal binder.

Experimental Modeling of Wind-Driven Bin-by-Bin Resuspension Factors of Freshly Fallen Radionuclides After an Energetic Release From a Radiological Dispersal Device

2015 ◽  
Vol 1 (1) ◽  
Author(s):  
Sharman Perera ◽  
Edward Waller ◽  
Ali Akhtar
Keyword(s):  
Surface Roughness ◽  
Wind Tunnel ◽  
Lanthanum Oxide ◽  
Experimental Modeling ◽  
Small Scale ◽  
Particle Sizes ◽  
Particle Resuspension ◽  
Measuring Devices ◽  
Radiological Dispersal ◽  
The Impact

Small-scale experiments were carried out to characterize the resuspension factor of radioactive lanthanum oxide powder in an environmentally controlled wind tunnel, with the majority using particle sizes less than 10 μm in order to assess the impact of wind resuspension stresses and surface roughness conditions on resuspension. Operational principles of the measuring devices used in the radionuclide resuspension experiments and corresponding uncertainties are discussed. The average bin-by-bin particle resuspension factors (ki) for particle sizes, in the range of 0.25–7.00 μm and 7.00–12.5 μm for downwind fallout locations, were calculated and are reported here as 1.14×10−3 1/m and 4.39×10−2 1/m, respectively.

Effect of Ingredient Particle Sizes on Surface Roughness Characteristics of PKS Brake Lining

2017 ◽  
Author(s):  
R. S. Fono-Tamo ◽  
Jen Tien-Chien
Keyword(s):  
Surface Roughness ◽  
Complex Structure ◽  
Palm Kernel ◽  
Mechanical Damage ◽  
Size Variation ◽  
Surface Preparation ◽  
Particle Sizes ◽  
Palm Kernel Shell ◽  
Reinforced Composite ◽  
Brake Lining

Besides pad failure due to thermal damage, brake pads can also experience mechanical damage when they are exposed to a corrosive environment. A typical solid surface like a brake pad has a complex structure and complex properties depending on the nature of the solids, the method of surface preparation, and the interaction between the surface and the environment. The surface roughness of a novel friction linings prepared using varying palm kernel shell (PKS) powder particle sizes (0.300 mm, 0.425 mm and 0.850 mm) as reinforcements were investigated. The investigation was conducted via a profilometer dotted with a diamond stylus at a speed of 0.2 m/s. The determined surface roughness parameters values were in ascending order with S0.300 having the least values (Ra = 6.13 μm, Rz = 24.04 μm and Rmax = 37.3 μm) and S0.850 having the highest values (Ra = 9.87 μm, Rz = 37.28 μm and Rmax = 53.8 μm). This was an indication that the roughness characteristics of the reinforced composite were associated to the presence of pulverised PKS particles. It was further shown by scanning electron microscope images that pulverised PKS grain sizes by nature have rough surfaces and this could have contributed to the overall roughness behaviour of the reinforced composite since PKS was the only ingredient with grain size variation in the experiment.

scholarly journals Effect of the Surface Roughness of Tungsten on the Sputtering Yield under Helium Irradiation: A Molecular Dynamics Study

Metals ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 1532
Author(s):  
Hyeonho Kim ◽  
Joongseok Kwon ◽  
Kunok Chang
Keyword(s):  
Molecular Dynamics ◽  
Surface Roughness ◽  
Experimental Studies ◽  
Experimental Results ◽  
Sputtering Yield ◽  
The Difference

Sputtering in a divertor is one of the key phenomena that affects plasma purity and temperature. In previous experimental studies, the term sputtering yield has been used to refer to net sputtering yield, which is defined as the difference between primary sputtering yield and re-deposition. Our simulations using molecular dynamics have confirmed that both primary sputtering yield and re-deposition are affected by particle curvature. In this study, the effect of particle curvature on the net sputtering yield was quantitatively evaluated, the results were compared to existing experimental studies, and the discrepancies with experimental results were discussed.

scholarly journals Experimental study on polishing process of cylindrical roller bearings

2019 ◽  
Vol 52 (9-10) ◽  
pp. 1272-1281 ◽  
Author(s):  
Duc Nam Nguyen ◽  
Ngoc Le Chau ◽  
Thanh-Phong Dao ◽  
Chander Prakash ◽  
Sunpreet Singh
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Taguchi Method ◽  
Abrasive Particle ◽  
Particle Sizes ◽  
Machining Parameters ◽  
Polishing Process ◽  
Bearing Life ◽  
Optimal Surface ◽  
Cylindrical Roller

The surface quality and accuracy of the geometry of the cylindrical rollers are important factors for bearing life. This paper presents effects of machining parameters on the surface roughness, topography and roundness of cylindrical rollers through the lapping and polishing experiments. And then the surface roughness of the cylindrical rollers is optimized. The results found that the surface roughness of rollers is significantly changed in lapping process with different abrasive particle sizes, while the surface roughness has slightly reduced in polishing process. It also indicated that the smoother surfaces with better roughness can be obtained after lapping and polishing process. In addition, the surface roughness of cylindrical rollers is rapidly reduced from Ra of 0.5 µm to Ra of 0.063 µm after the 3-h lapping process and Ra of 0.013 µm after the 1-h polishing process. The surface topography of rollers can be achieved by the smoother surface when loads are from 25 to 35 N in lapping process, and the loads are from 35 to 40 N in polishing process. Finally, the Taguchi method is applied to optimize the surface roughness in polishing process. The result found that the optimal surface roughness achieves 0.015 µm with respect to the time of 35 min and type of 4000# Al2O3.

Study on the Effect of Streambed Substrate on Invertebrate Diversity

2014 ◽  
Vol 937 ◽  
pp. 491-494
Author(s):  
Zhi Wen Luo ◽  
Wen Yan Wu ◽  
Kun Le
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Species Richness ◽  
Field Experiment ◽  
Stream Ecosystems ◽  
Particle Sizes ◽  
Invertebrate Community ◽  
Invertebrate Diversity ◽  
Invertebrate Composition ◽  
Substrate Particle

Invertebrates are important components of stream ecosystems. A field experiment was conducted to study the effects of substrate particle size, shape and roughness on the composition and biodiversity of invertebrates. The results show that the particle sizes, porosity,and interstial dimensions of the substrate affect the invertebrate community,while the shape and surface roughness of the substrate do not strongly affect the benthos composition and density. The invertebrate composition in the gravel is stable. The density and species richness in the gravels, leaf humus and are much higher than those in the black silt and sands.

Effects of Combination of Powders with Different Particle Sizes on Surface Roughness and Internal Defects of IN738 Alloy Formed by Selective Laser Melting

2021 ◽  
Vol 58 (1) ◽  
pp. 0114003
Author(s):  
胡勇 Hu Yong ◽  
杨小康 Yang Xiaokang ◽  
康文江 Kang Wenjiang ◽  
丁雨田 Ding Yutian ◽  
许佳玉 Xu Jiayu ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Selective Laser Melting ◽  
Particle Sizes ◽  
Laser Melting ◽  
Internal Defects ◽  
In738 Alloy

scholarly journals The Condition of Ni-Cr Alloy Surface After Abrasive Blasting with Various Parameters

2019 ◽  
Vol 29 (3) ◽  
pp. 1439-1444
Author(s):  
Weronika Czepułkowska ◽  
Emilia Wołowiec-Korecka ◽  
Leszek Klimek
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Statistical Analysis ◽  
Metal Surface ◽  
Statistical Significance ◽  
Alloy Surface ◽  
Particle Sizes ◽  
Roughness Parameters ◽  
Abrasive Particles ◽  
Abrasive Blasting

Abstract The parameters of abrasive blasting process directly affect the condition of the metal surface, changing the degree of surface roughness and wettability, depending on the size of the used particle, the pressure or type of abrasive. The aim of this study was to analyze the condition of Ni-Cr alloy surface after abrasive blasting using various process variants. The samples were blasted by Al2O3 abrasive using various particle sizes and pressures of the process. Basic and specific roughness parameters were investigated, and a surface wettability test was performed, and the percentage share of abrasive particles penetrated in the surface after abrasive blasting was also examined. The most considerable differences in the condition of the surface were observed with the change in the particle size of Al2O3. Statistical analysis confirmed the statistical significance of all these relationships.

scholarly journals Magnetic Abrasive Finishing of Beta-Titanium Wire Using Multiple Transfer Movement Method

2020 ◽  
Vol 10 (19) ◽  
pp. 6729
Author(s):  
Sung Sik Nam ◽  
Jeong Su Kim ◽  
Sang Don Mun
Keyword(s):  
Surface Roughness ◽  
Particle Sizes ◽  
Magnetic Abrasive Finishing ◽  
Beta Titanium ◽  
Processing Power ◽  
Finishing Process ◽  
Abrasive Finishing ◽  
Titanium Wire ◽  
Magnetic Abrasives ◽  
Diamond Paste

Titanium is often used in various important applications in transportation and the healthcare industry. The goal of this study was to determine the optimum processing of magnetic abrasives in beta-titanium wire, which is often used in frames for eyeglasses because of its excellent elasticity among titanium alloys. To check the performance of the magnetic abrasive finishing process, the surface roughness (Ra) was measured when the specimen was machined at various rotational speeds (700, 1500, and 2000 rpm) in the presence of diamond paste of various particle sizes (0.5, 1, and 3 μm). We concluded that the surface roughness (Ra) was the best at 2000 rpm, 1 μm particle size, and 300 s processing time, and the surface roughness of β-titanium improved from 0.32 to 0.05 μm. In addition, the optimal conditions were used to test the influence of the finishing gap, and it was found that the processing power was superior at a gap of 3 mm than at 5 mm when processing was conducted for 300 s.

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