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Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Vortrag

Simon Killinger, Alexander Haberl, Rolf Rascher

Analysis of residual errors during computer controlled polishing

EOS Optical Technologies: Conference on Manufacturing, Tolerancing and Testing of Optical Systems (MOS) – Session 7: Plenary Session, München

2019

Abstract anzeigen

In computer controlled subapertur polishing the formation of mid spatial frequency errors (MSFE) needs special attention. In this work the formation of MSFE in feed direction is investigated using the ADAPT tool from Satisloh.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Vortrag

Sebastian Sitzberger, P. Rinck, A. Gueray, Rolf Rascher

Ultraschallunterstützte Zerspanung von Advanced Materials

3. Wissenschaftliches Forum zur ULTRASONIC-Bearbeitung, Jena

2019

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen IPH Teisnach

Vortrag

Sebastian Sitzberger, Jakob Reitberger, Rolf Rascher

Clamping system for optical components for adaptation in optical production

10th HLEM 2019 - High Level Expert Meeting Asphere Metrology on Joint Investigations, Braunschweig

2019

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen TAZ Spiegelau

Zeitschriftenartikel

Benedikt Scharfe, S. Lehmann, Thorsten Gerdes, D. Brüggemann

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites

Journal of Composites Science, vol. 3, no. 101, pp. 1-17

2019

DOI: 10.3390/jcs3040101

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In this paper, the dynamic mechanic and optical properties of composites made of Polyvinyl Butyral (PVB) and Micro Glass Flakes (MGF) with matching refractive indices (RIs) are investigated. The composite is produced by a slurry-based process using additional blade casting and lamination. It can be shown that a high degree of ordering of the MGF in the polymer matrix can be achieved with this method. This ordering, combined with the platelet-like structure of the MGF, leads to very efficient strengthening of the PVB with increasing content of the MGF. By carefully adjusting the RIs of the polymer, it is shown that haze is reduced to below 2%, which has not been achieved with irregular fillers or glass fibers.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen TAZ Spiegelau

Zeitschriftenartikel

L. Schwinger, S. Lehmann, L. Zielbauer, Benedikt Scharfe, Thorsten Gerdes

Aluminum Coated Micro Glass Spheres to Increase the Infrared Reflectance

Coatings (Special Issue "Current Research in Thin Film Deposition: Applications, Theory, Processing, and Characterisation"), vol. 9, no. 3

2019

DOI: 10.3390/coatings9030187

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The reflective properties of micro glass spheres (MGS) such as Solid Micro Glass Spheres (SMGS, “glass beads”) and Micro Hollow Glass Spheres (MHGS, “glass bubbles”) are utilized in various applications, for example, as retro-reflector for traffic road stripe paints or facade paints. The reflection behavior of the spheres can be further adapted by coating the surfaces of the spheres, e.g., by titanium dioxide or a metallic coating. Such coated spheres can be employed as, e.g., mid infrared (MIR)-reflective additives in wall paints to increase the thermal comfort in rooms. As a result, the demand of heating energy can be reduced. In this paper, the increase of the MIR-reflectance by applying an aluminum coating on MGS is discussed. Aluminum coatings are normally produced via the well-known Physical Vapor Deposition (PVD) or Chemical Vapor Deposition (CVD). In our work, the Liquid Phase Deposition (LPD) method, as a new, non-vacuum method for aluminum coating on spherical spheres, is investigated as an alternative, scalable, and simple coating process. The LPD-coating is characterized by X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and reflection measurements. The results are compared to a reference PVD-coating. It is shown that both sphere types, SMGS and MHGS, can be homogeneously coated with metallic aluminum using the LPD method but the surface morphology plays an important role concerning the reflection properties. With the SMGS, a smooth surface morphology and a reflectance increase to a value of 30% can be obtained. Due to a structured surface morphology, a reflection of only 5% could be achieved with the MHGS. However, post-treatments showed that a further increase is possible.

Nachhaltig Elektrotechnik und Medientechnik IQMA

Vortrag

Christoph Metzke, Günther Benstetter, Werner Frammelsberger, Jonas Weber, Fabian Kühnel

Temperature dependent investigation of hexagonal boron nitride films using scanning thermal microscopy

Poster presentation

6th Nano Today Conference 2019, Lisbon, Portugal

2019

Nachhaltig Elektrotechnik und Medientechnik IQMA

Zeitschriftenartikel

Z. Bi, D. Liu, Y. Zhang, L. Liu, Y. Xia, Y. Hong, H. Fan, Günther Benstetter, G. Lei, L. Yan

The evolution of He nanobubbles in tungsten under fusion-relevant He ion irradiation conditions

Nuclear Fusion, vol. 59, no. 8

2019

DOI: 10.1088/1741-4326/ab2472

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He-induced W nanofuzz growth over the W divertor target is one of the main limiting factors affecting the current design and development of fusion reactors. In this paper, based on He reaction rate model in W, we simulate the growth and evolution of He nanobubbles during W nanofuzz formation under fusion-relevant He+ irradiation conditions. Our modeling unveils the existence of He nanobubble-enriched W surface layer (<10 nm), formed due to the He diffusion in W crystal into defect sites. At an elevated temperature, the growth of He bubbles in the W surface layer prevents He atoms diffusing into the deep layer (>10 nm). The formation of W nanofuzz at the surface is attributed to surface bursting of high-density He bubbles with their radius of ~4 nm, and an increase in the surface area of irradiated W. Our findings have been well confirmed by the experimental measurements.

Nachhaltig Elektrotechnik und Medientechnik IQMA

Zeitschriftenartikel

W. Ni, L. Liu, Y. Zhang, H. Fan, G. Song, D. Liu, Günther Benstetter, G. Lei

Mass loss of pure W, W-Re alloys, and oxide dispersed W under ITER-relevant He ion irradiations

Journal of Nuclear Materials, vol. 527

2019

DOI: 10.1016/j.jnucmat.2019.151800

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In this study, polycrystalline W, W-Re alloys, and La2O3 and Y2O3 dispersion-strengthened W have been irradiated by our large-power materials irradiation experimental system (LP-MIES) at the irradiation temperature of 1360–1460 K. Our measurements show that the W nano-fuzz layer which is < 5.2 μm thick has been formed over all the specimens exposed to the low-energy (50 or 100 eV) and high-flux (1.37 × 1022–1.62 × 1022 ions/m2⋅s) He+ irradiations. The mass loss of the fuzz layer almost linearly increases with the He+ fluence, which does not show any dependence on the thickness of fuzz layer varying from 1.1 to 5.2 μm La2O3 and Y2O3 dispersions into W significantly suppress the growth of W fuzz, indicating that He diffusion and the evolution of He nano-bubbles in the near-surface can be significantly influenced due to the dispersion. After He+ (100 eV) irradiation at He+ fluence of 5.83 × 1026/m2, the mass loss of 0.1 vol% - 1.0 vol% La2O3-dispersed W is about 20% lower than the one of the pure W, and the La2O3 dispersed W exhibits the best erosion resistance among various W material grades. Our analysis indicates that both the surface sputtering of W fuzz by energetic ions and surface bursting of He nano-bubbles can be responsible for the mass loss of W under ITER-relevant He+ irradiations.

Nachhaltig Elektrotechnik und Medientechnik IQMA

Zeitschriftenartikel

C. Wen, X. Jing, F. Hitzel, C. Pan, Günther Benstetter, M. Lanza

In Situ Observation of Current Generation in ZnO Nanowire Based Nanogenerators Using a CAFM Integrated into an SEM

ACS Applied Materials & Interfaces, vol. 11, no. 17, pp. 15183-15188

2019

DOI: 10.1021/acsami.9b00447

Abstract anzeigen

In this work, we monitor in situ the movement of ZnO piezoelectric nanowires by using a conductive atomic force microscope integrated into a scanning electron microscope. This setup allows seeing the bending of the nanowires and simultaneously measuring the currents generated. We conclude that the currents generated not only come from piezoelectric effect, but also from contact potential and triboelectric effect. These contributions have been ignored in all previous reports in this field, meaning that the power conversion efficiency of these devices may have been systematically overestimated. Our study helps to clarify the working mechanism of piezoelectric nanogenerators based on ZnO nanowires.

Nachhaltig Angewandte Naturwissenschaften und Wirtschaftsingenieurwesen TC Teisnach 2 Sensorik

Vortrag

Alois Kasberger, Raimund Förg

Heißprägen von Glassubstraten als Basis kapazitiver Ultraschall-Sensorik

2. Technologietag Angewandte Sensorik (TAS), Coburg

2019

Gesund Nachhaltig Europan Campus Rottal-Inn

Beitrag (Sammelband oder Tagungsband)

S. Markov, Georg Steckenbauer, Markus Pillmayer, Marcus Herntrei

Austria: The forest as a touristic landscape

International Handbook of Forest Therapy

2019