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Prof. Dr.-Ing. Thorsten Gerdes

Centre for Applied Research

Technology application centre Spiegelau

Academic Director

Sortierung:
Lecture
  • M. Willert-Porada
  • Thorsten Gerdes
  • A. Rosin
  • A. Saberi
  • A. Füller
  • Rolf Rascher
  • Christine Wünsche

Flexiplant: schmelzebasierte kontinuierliche Herstellung von low TG-Glas-Preformen (mittels Minimeltertechnologie).

In: 87. Glastechnische Tagung

HVG-DGG: Service und Forschung für die Glasherstellung Bremen

  • 27.-29.05.2013 (2013)
Lecture
  • Thorsten Gerdes
  • K. Kyrgyzbayev
  • A. Rosin
  • A. Saberi
  • A. Füller
  • Rolf Rascher
  • Christine Wünsche

Aims for the development of new optical glass materials.

In: 1st European Seminar on Precision Optics Manufacturing

Technische Hochschule Deggendorf (THD)/Technologie Campus Teisnach Teisnach

  • 01.-02.04.2014 (2014)
Journal article
  • Benedikt Scharfe
  • S. Lehmann
  • Thorsten Gerdes
  • D. Brüggemann

Optical and Mechanical Properties of Highly Transparent Glass-Flake Composites.

In: Journal of Composites Science vol. 3 pg. 1-17

  • (2019)

DOI: 10.3390/jcs3040101

show abstract

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.
Journal article
  • L. Schwinger
  • S. Lehmann
  • L. Zielbauer
  • Benedikt Scharfe
  • Thorsten Gerdes

Aluminum Coated Micro Glass Spheres to Increase the Infrared Reflectance.

In: Coatings (Special Issue "Current Research in Thin Film Deposition: Applications, Theory, Processing, and Characterisation") vol. 9 pg. 187

  • (2019)

DOI: 10.3390/coatings9030187

show abstract

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.
Lecture
  • Harald Zimmermann
  • Thorsten Gerdes

Glasproduktion ohne CO2-Emissionen: Eine Utopie?.

In: 1. Fachforum Glas

Kompetenzzentrum Klimaschutz in energieintensiven Industrien Online

  • 2020 (2020)
Lecture
  • Tobias Helling
  • Thorsten Gerdes

MicroBubble – Energetische Optimierung der Herstellung von Microhohlglaskugeln durch direkte Formung aus der Schmelze. Poster.

In: 7. Tag der Forschung der THD 2020

Technische Hochschule Deggendorf Online

  • 23.07.2020 (2020)
Lecture
  • Tobias Helling
  • Thorsten Gerdes
  • Harald Zimmermann

Mikrohohlglaskugeln - Ein Nischenprodukt mit Potential.

In: Vernissage Klaus Büchler "Kunst trifft Technologie"

Spiegelau

  • 03.05.2022 (2022)
Lecture
  • Tobias Helling
  • Thorsten Gerdes
  • Harald Zimmermann

Direct forming of hollow glass microspheres out of the melt.

In: 26th International Congress on Glass

International Commission on Glass Berlin

  • 05.07.2022 (2022)
Lecture
  • Weniamin Yusim
  • Harald Zimmermann
  • L. Biennek
  • Thorsten Gerdes

The use of sodium chloride as a fining agent in all-electrical melting.

In: 26th International Congress on Glass

International Commission on Glass Berlin

  • 06.07.2022 (2022)
Lecture
  • Tobias Helling
  • Thorsten Gerdes
  • Harald Zimmermann

Prozessentwicklung zur direkten Formung von Mikrohohlglassphären aus einer Glasschmelze.

In: BayWISS-Doktorandentreffen

Online

  • 20.07.2022 (2022)
Journal article
  • Tobias Helling
  • Florian Reischl
  • A. Rosin
  • Thorsten Gerdes
  • Walter Krenkel

Atomization of Borosilicate Glass Melts for the Fabrication of Hollow Glass Microspheres.

In: Processes vol. 11 pg. 2559

  • (2023)

DOI: 10.3390/pr11092559

show abstract

Direct atomization of a free-flowing glass melt was carried out using a high-speed flame with the aim of producing tiny, self-expanding glass melt droplets to form hollow glass microspheres. Atomization experiments were carried out using a specially adapted free-fall atomizer in combination with a high-power gas burner to achieve sufficient temperatures to atomize the melt droplets and to directly expand them into hollow glass spheres. In addition, numerical simulations were carried out to investigate non-measurable parameters such as hot gas velocities and temperatures in the flame region by the finite volume-based software Star CCM+® (v. 2022.1.1), using the Reynolds-Averaged Navier–Stokes (RANS) turbulence and the segregated flow model. To calculate the combustion process, the laminar flamelet method was used. The experiments and simulations indicated that a maximum gas velocity of about 170 m/s was achieved at the point of atomization in the flame. The particle size distribution of the atomized glass droplets, either solid or hollow, ranged from 2 µm to 4 mm. Mean particle sizes in the range of 370 µm to 650 µm were highly dependent on process parameters such as gas velocity. They were in good agreement with theoretically calculated median diameters. The formation of hollow glass microspheres with the proposed concept could be demonstrated. However, only a small fraction of hollow glass spheres was found to be formed. These hollow spheres had diameters up to 50 µm and, as expected, a thin wall thickness.
Lecture
  • Tobias Helling
  • A. Rosin
  • Florian Reischl
  • Harald Zimmermann
  • Thorsten Gerdes

Influence of process parameters on the direct forming of hollow microspheres from a borosilicate glass melt.

In: 97. Glass-Technology Conference/DGG-Tagung

Deutsche Glastechnische Gesellschaft e.V. Aachen

  • 27.-29.05.2024 (2024)