Laser singulation of thin wafer: Die strength and surface roughness analysis of 80μm silicon dice

2009 ◽  
Vol 47 (7-8) ◽  
pp. 850-854 ◽  
Author(s):  
Nitin Sudani ◽  
Krishnan Venkatakrishnan ◽  
Bo Tan
Keyword(s):  
Surface Roughness ◽  
Roughness Analysis

Surface properties of composite resins with and without fluorides for bracket bonding / Propriedades de superfície de resinas compostas com e sem fluoretos para colagem de suportes

2021 ◽  
Vol 7 (7) ◽  
pp. 67267-67276
Author(s):  
Emillyn Jones Greijal Dias Holanda ◽  
José Guilherme Neves ◽  
Milton Santamaria-Jr ◽  
Silvia Amélia Scudeler Vedovello ◽  
Ana Rosa Costa ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Surface Properties ◽  
Color Change ◽  
Composite Resins ◽  
Hardness Tester ◽  
Significant Difference ◽  
Post Test ◽  
Roughness Analysis ◽  
Diamond Paste ◽  
Penetration Time

The aim of this study was to evaluate the surface properties of orthodontic resins with and without fluoride. Forty disks, measuring 2 mm thick by 6 mm in diameter, were made of 4 bracket-bonding composite resins (n=10): Transbond Plus Color Change-3M/Unitek (TPCC); Transbond XT- 3M/Unitek (TXT), Orthocem -FGM (OC); Orthocem UV Trace-FGM (OCUV). The discs were photoactivated for 40 seconds with irradiance of 450 mW/cm2 and manually polished in sequence by silicon carbide sandpapers with 1200 and 2000 grain size and finished with diamond paste and felt disc. The surface microhardness analysis was performed using a Shimadzu Micro Hardness Tester HMV-2,000 (Shimadzu Corporation, Kyoto, Japan) with a load of 50 gF and a 5 second penetration time. Surface roughness readings were taken using a Surf Corder Roughness Meter (SE 1700- Kosaka, Lisboa-Portugal). For data analysis, ANOVA (one-way) was used, followed by Tukey's post-test (?=0.05). The microhardness results showed a difference (p?0.05) in the means of the orthodontic resins between TPCC and TXT with the other groups. After the surface roughness analysis, the averages showed that TPCC resin showed higher roughness compared to OC and OCUV (p?0.05), and there was no statistical difference with TXT. It was concluded that statistically the composite resins with fluoride showed significant difference regarding hardness and roughness.

Surface Roughness Analysis of 3D Printed Parts Using Response Surface Modeling

2020 ◽  
Author(s):  
Emmanuelle R. Biglete ◽  
Mark Christian E. Manuel ◽  
Jennifer C. Dela Cruz ◽  
Marvin S. Verdadero ◽  
John Michael B. Diesta ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Response Surface ◽  
Surface Modeling ◽  
Response Surface Modeling ◽  
Roughness Analysis ◽  
3D Printed

Analysis on the Micro Surface Morphology of Aged Oil-Paper Used in Power Transformer

2013 ◽  
Vol 860-863 ◽  
pp. 894-898
Author(s):  
Chao Tang ◽  
Sheng Li Dai ◽  
Jiao Li
Keyword(s):  
Surface Roughness ◽  
Surface Morphology ◽  
Power Transformer ◽  
Roughness Parameter ◽  
Fiber Surface ◽  
Thermal Ageing ◽  
Molecular Arrangement ◽  
Atomic Force ◽  
Roughness Analysis ◽  
Mesh Structures

In order to analyze the ageing mechanism of oil-paper, the Atomic Force Microscope (AFM), which is one of the important instruments in nanometer area, was used in this paper for the analysis of the micro surface morphology, and a 3-D surface roughness analysis on the AFM image was presented. The AFM figures indicates that the molecular arrangement of the initial cellulose paper is close and ordered, some of the hexagonal mesh structures of the D-glucopyranose units were broken down after 100 days accelerated thermal ageing. The roughness analysis indicates that he fiber surface roughness parameter Sa increases with the deepening of ageing degree. Special attention should be paid on the increase in the surface roughness of insulation paper, as it will aggravate the oil streaming electrification when the paper is applied to the power transformers.

Surface roughness analysis of ceramic bracket slots using atomic force microscope

2010 ◽  
Vol 40 (5) ◽  
pp. 294 ◽  
Author(s):  
Ki-Ho Park ◽  
Hyun-Joo Yoon ◽  
Su-Jung Kim ◽  
Gi-Ja Lee ◽  
Hun-Kuk Park ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Atomic Force Microscope ◽  
Atomic Force ◽  
Roughness Analysis ◽  
Ceramic Bracket

scholarly journals Prediction and parametric optimization of surface roughness of electroless Ni-Co-P coating using Box-Behnken design

2019 ◽  
Vol 28 (1) ◽  
pp. 153-161 ◽  
Author(s):  
Subhasish Sarkar ◽  
Arghya Mukherjee ◽  
Rishav Kumar Baranwal ◽  
Jhumpa De ◽  
Chanchal Biswas ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Parametric Optimization ◽  
Bath Temperature ◽  
Sodium Hypophosphite ◽  
X Ray Diffraction ◽  
Box Behnken Design ◽  
X Ray ◽  
Xrd Study ◽  
Roughness Analysis ◽  
Electroless Ni

AbstractThe current study focuses on the parametric optimization of electroless Ni-Co-P coating considering surface roughness as a response using Box-Behnken Design (BBD) of experiment. The two bath parameters namely the concentration of cobalt sulphate and sodium hypophosphite were varied along with the bath temperature to predict the variation in surface roughness. Analysis of variance (ANOVA) method has been applied to determine the interactions of the substantial factors which dominate the surface roughness of the coating. The process parameters for surface roughness of the coating were optimized by successfully utilizing the statistical model of Box-Behnken Design (BBD) of experiment. From the BBD model, the optimum condition for the deposition of the coating has been evaluated. In that specific condition, the surface roughness of the as-deposited coating is found to be 0.913μm. Scanning Electron Microscopy (SEM), Energy Dispersive X-ray Spectroscopy (EDX), and X-Ray Diffraction (XRD) study have been utilized to characterize the electroless Ni-Co-P coating deposited in optimized condition.

Effect of various factors influencing the generation of hemispherical micro features using non-conformal RMEDM

2019 ◽  
Vol 2 (2) ◽  
pp. 110-122 ◽  
Author(s):  
T. Roy ◽  
R. Balasubramaniam
Keyword(s):  
Surface Roughness ◽  
Electrical Discharge Machining ◽  
Flat Bottom ◽  
Machining Time ◽  
Micro Electrical Discharge Machining ◽  
Bottom Hole ◽  
Roughness Analysis ◽  
Feature Based ◽  
Different Shapes ◽  
Micro Features

Non-conformal reverse micro electrical discharge machining (NC-RMEDM) is a variant of conventional RMEDM developed by the present authors wherein modification in the tool is carried out to generate different shapes of micro features. In this study, the effect of various factors like flat bottom and taper bottom hole, inversing the position of tool and workpiece and changing the hole depth have been experimentally investigated to determine the optimal combination required for generating hemispherical shaped micro features. It was found that hemispherical shaped micro feature can be generated by employing tapered bottom blind hole as tool. Buoyancy assisted machining (BAM) with traverse of workpiece (anode) downwards into the tool (cathode) and vice versa, i.e., buoyancy opposed machining (BOM) with traverse of tool downwards into the workpiece were carried out to study the generation of hemispherical micro feature based on inversion of electrode positions. Although both BAM and BOM generated hemispherical shaped feature, BAM is preferred due to reduced machining time as opposed to BOM. Also, increasing the hole depths led to altering the shape of micro feature from hemispherical to cylindrical with hemispherical end and coni-spherical end. An array of hemispherical micro features was fabricated based on the finding from this study, and surface roughness analysis was carried out which showed that irrespective of the position of micro feature on the array, surface roughness at the tip and base of the micro feature is lower as compared to side portion.

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