scholarly journals Evaluation of the surface quality of spun materials using topothesy

2021 ◽  
Vol 2 (2) ◽  
pp. 208-216
Author(s):  
Tomasz Blachowicz ◽  
Michal Koruszowic
Keyword(s):  
Solid State ◽  
Structural Properties ◽  
Surface Quality ◽  
Fractal Dimensions ◽  
Helium Ion ◽  
Spatial Morphology ◽  
Ion Microscopy ◽  
Poly Acrylonitrile

Topothesy and fractal dimensions were calculated for poly(acrylonitrile) (PAN) nanofibers mats obtained by electrospinning. These methods enable quantitatively describing and thus comparing solid-state surfaces and detecting fabric errors. The obtained variety of structural properties results from different substrates and after-treatments, e.g. stabilization and carbonization. The change in spatial morphology was reported for different magnification of images obtained with the use of Helium Ion Microscopy (HIM).

scholarly journals On the reliability of highly magnified micrographs for structural analysis in materials science

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Martin Wortmann ◽  
Ashley Stephen Layland ◽  
Natalie Frese ◽  
Uwe Kahmann ◽  
Timo Grothe ◽  
...  
Keyword(s):  
Materials Science ◽  
Scientific Literature ◽  
Micromagnetic Simulations ◽  
Transmission Electron ◽  
Helium Ion ◽  
Cherry Picking ◽  
Ion Microscopy ◽  
Embedded Nanoparticles ◽  
Poly Acrylonitrile ◽  
Bare Minimum

Abstract Highly magnified micrographs are part of the majority of publications in materials science and related fields. They are often the basis for discussions and far-reaching conclusions on the nature of the specimen. In many cases, reviewers demand and researchers deliver only the bare minimum of micrographs to substantiate the research hypothesis at hand. In this work, we use heterogeneous poly(acrylonitrile) nanofiber nonwovens with embedded nanoparticles to demonstrate how an insufficient or biased micrograph selection may lead to erroneous conclusions. Different micrographs taken by transmission electron microscopy and helium ion microscopy with sometimes contradictory implications were analyzed and used as a basis for micromagnetic simulations. With this, we try to raise awareness for the possible consequences of cherry-picking for the reliability of scientific literature.

Influence of Carbon Content on Surface Quality of Solid-State Sintered SiC Ceramics

2012 ◽  
Vol 9 (4) ◽  
pp. 847-852 ◽  
Author(s):  
Jianqin Gao ◽  
Jian Chen ◽  
Guiling Liu ◽  
Yongjie Yan ◽  
Zhengren Huang
Keyword(s):  
Solid State ◽  
Carbon Content ◽  
Surface Quality ◽  
Sic Ceramics

The effect of carbon on surface quality of solid-state-sintered silicon carbide as optical materials

2014 ◽  
Vol 89 ◽  
pp. 7-12 ◽  
Author(s):  
Jian Chen ◽  
Zhengren Huang ◽  
Zhongming Chen ◽  
Ming Yuan ◽  
Yan Liu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Solid State ◽  
Surface Quality ◽  
Optical Materials ◽  
Sintered Silicon

A Study of the Solid-State Reaction for Polishing Sapphires

2012 ◽  
Vol 497 ◽  
pp. 195-199 ◽  
Author(s):  
Qian Fa Deng ◽  
Zhi Xiong Zhou ◽  
Zhao Zhong Zhou ◽  
Ju Long Yuan ◽  
Ji Cui Wang
Keyword(s):  
Solid State ◽  
Surface Quality ◽  
Material Removal Rate ◽  
Surface Finish ◽  
Solid State Reaction ◽  
Material Removal ◽  
Removal Rate ◽  
Substrate Material ◽  
Quality Requirements

As sapphire is an important substrate material, stringent surface quality requirements (i.e., surface finish and flatness) are required. In order to acquire the higher material removal rate and the better surface quality of sapphire, the solid state-reaction were introduced in this paper; abrasive of SiO2 and SiO2 with mixing the MgF2 power were compared to polish sapphire. The result showed that abrasive of SiO2 with mixing the MgF2 can obtain higher material removal rate and better surface quality. The result of the pr

scholarly journals Superior Imaging Quality of Scanning Helium-Ion Microscopy: a Look at Beam-Sample Interactions,

2009 ◽  
Vol 15 (S2) ◽  
pp. 656-657
Author(s):  
D Cohen-Tanugi ◽  
N Yao
Keyword(s):  
Imaging Quality ◽  
Beam Sample ◽  
Helium Ion ◽  
Ion Microscopy

Extended abstract of a paper presented at Microscopy and Microanalysis 2009 in Richmond, Virginia, USA, July 26 – July 30, 2009

HIMaging the kidney: High resolution helium ion microscopy

2014 ◽  
pp. 32-35
Author(s):  
Teodor Paunescu ◽  
Sylvie Breton ◽  
Dennis Brown
Keyword(s):  
High Resolution ◽  
Helium Ion ◽  
Ion Microscopy

Schwingungsüberlagertes Axialformen/Superimposed Oscillated Axial Forming

2020 ◽  
Vol 110 (11-12) ◽  
pp. 838-843
Author(s):  
Philipp Müller ◽  
Bernd-Arno Behrens ◽  
Sven Hübner ◽  
Hendrik Vogt ◽  
Daniel Rosenbusch ◽  
...  
Keyword(s):  
Surface Quality ◽  
Economic Importance ◽  
Combined Effect ◽  
Wird Eine ◽  
Forming Force ◽  
Forming Process ◽  
Forming Technology ◽  
Great Economic Importance ◽  
Gear Geometry

Techniken zur Steigerung der Formgebungsgrenzen in der Umformtechnik sind von hoher wirtschaftlicher Bedeutung. In dieser Arbeit wird eine Schwingungsüberlagerung im Krafthauptfluss eines Axialformprozesses zur Ausprägung einer Verzahnungsgeometrie untersucht. Die Auswirkungen der Schwingung auf die erzielbare Ausfüllung der Zahnkavitäten werden analysiert sowie die Parameter Schmierung und Oberflächengüte der Halbzeuge in ihrer kombinierten Wirkung untersucht. Es konnte eine Reduzierung der mittleren Umformkraft sowie eine Erhöhung der Formfüllung festgestellt werden. Techniques for extending the production limits in forming technology are of great economic importance. In this research, a superimposed oscillation in the main force flow of an axial forming process to form an axial gear geometry is investigated. The effects of the superimposed oscillation on the achievable form-filling of the tooth cavities are analyzed and the parameters lubrication and surface quality of the semi-finished products are investigated in their combined effect. A reduction of the averaged forming force as well as an increase of the form-filling could be achieved.

scholarly journals Face Grinding Surface Quality of High Volume Fraction SiCp/Al Composite Materials

2021 ◽  
Vol 34 (1) ◽  
Author(s):  
Xu Zhao ◽  
Yadong Gong ◽  
Guiqiang Liang ◽  
Ming Cai ◽  
Bing Han
Keyword(s):  
Friction Coefficient ◽  
Surface Morphology ◽  
Surface Quality ◽  
Volume Fraction ◽  
High Volume ◽  
Spindle Speed ◽  
High Volume Fraction ◽  
Machining Parameters ◽  
Al Composite

AbstractThe existing research on SiCp/Al composite machining mainly focuses on the machining parameters or surface morphology. However, the surface quality of SiCp/Al composites with a high volume fraction has not been extensively studied. In this study, 32 SiCp/Al specimens with a high volume fraction were prepared and their machining parameters measured. The surface quality of the specimens was then tested and the effect of the grinding parameters on the surface quality was analyzed. The grinding quality of the composite specimens was comprehensively analyzed taking the grinding force, friction coefficient, and roughness parameters as the evaluation standards. The best grinding parameters were obtained by analyzing the surface morphology. The results show that, a higher spindle speed should be chosen to obtain a better surface quality. The final surface quality is related to the friction coefficient, surface roughness, and fragmentation degree as well as the quantity and distribution of the defects. Lower feeding amount, lower grinding depth and appropriately higher spindle speed should be chosen to obtain better surface quality. Lower feeding amount, higher grinding depth and spindle speed should be chosen to balance grind efficiently and surface quality. This study proposes a systematic evaluation method, which can be used to guide the machining of SiCp/Al composites with a high volume fraction.

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