Author
Christian Seidel
Bio: Christian Seidel is an academic researcher from Siemens. The author has contributed to research in topics: Turbine blade & Coating. The author has an hindex of 4, co-authored 49 publications receiving 297 citations.
Topics: Turbine blade, Coating, Creep, Epoxy, Fire retardant
Papers
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TL;DR: In this paper, the influence of graphite nano-platelets (GNPs) on the electrical and thermal conductivity, fracture toughness and storage modulus of the nano-composite was investigated.
280 citations
Patent•
02 Aug 2013TL;DR: In this paper, an elektrisches oder elektronisches Bauteil with einer Verkapselungs- und/oder Unterfull-Masse, aufgrund derer der Warmehaushalt des Bauteils besser regulierbar ist.
Abstract: Die Erfindung betrifft ein elektrisches oder elektronisches Bauteil mit einer Verkapselungs- und/oder Unterfull-Masse, aufgrund derer der Warmehaushalt des Bauteils besser regulierbar ist. Dies insbesondere dadurch, weil als Kuhlelement ein PCM in einer elastomeren Matrix eingesetzt wird.
9 citations
TL;DR: Thermoset carbon-fiber SMCs (sheet mold compounds) can also be affected by creep under long-term loading, and a promising possibility to limit the loss of preload force due to creep was simulatively evaluated.
Abstract: The application of chopped-fiber reinforced polymers in screwed connections at high temperatures raises the question of creep under long-term loading. While up to now thermoplastic materials have mainly been the focus of attention when it comes to creep, this paper shows that thermoset carbon-fiber SMCs (sheet mold compounds) can also be affected by this phenomenon. Screwed connections were investigated regarding their loss of preload force at 120 °C ambient temperature. Additionally, strain-time diagrams were recorded at different stress levels at 120 °C in a creep test setup of a universal testing machine by using optical strain tracking of SMC coupons. The transverse modulus under compression in thickness direction was determined in the same test setup. For data application within a FEA (finite element analysis) software power law curves according to Norton-Bailey creep law were fitted in the strain-time graphs. The applicability of the obtained creep law was crosschecked with a test carried out on the loss of preload force of a screwed connection. The developed simulative methodology offers the possibility to simulate various mounting situations of the bolted connection and to investigate measures against the loss of preload force easily. A promising possibility to limit the loss of preload force due to creep was simulatively evaluated.
8 citations
Patent•
28 Oct 2010
TL;DR: In this article, a turbine blade of a steam turbine is characterized as having a highly elastic elastomeric coating on the upper blade side and/or in the turbine blade.
Abstract: The invention relates to a turbine blade (1) of rotor blading or guide blading of a turbine stage, in particular of a turbine output stage, of a steam turbine, wherein at least sections of the turbine blade (1) are composed of metal or fiber composite material, wherein at least in sections a highly elastic elastomeric coating (3) is arranged on the upper blade side and/or in the turbine blade (1), and at least in sections a metal coat (4) is provided on the upper blade surface, in particular on the highly elastic elastomeric coating (4), wherein the metal coat (4) is a thin, energy-absorbing metal coating. The invention further relates to rotor blading or guide blading of a turbine stage, in particular the output stage blading, of a steam turbine, which is characterized in that the rotor blading or guide blading comprises a plurality of turbine blades (1) designed in this way.
5 citations
Patent•
16 Jan 2012TL;DR: In this article, die Erfindung betrifft ein Faserflachengebilde, bei dem Fasern in eine Matrix eingebettet sind.
Abstract: Die Erfindung betrifft ein Faserflachengebilde, bei dem Fasern in eine Matrix eingebettet sind. Gemas der Erfindung wird eine gesteigerte mechanische Festigkeit durch Verbesserung der Adhasion zwischen der Faser und der Matrix erreicht.
4 citations
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TL;DR: In this paper, theoretical and experimental aspects of thermal conductivity in composites, from thermal energy generation to heat transfers, are reviewed, and the fundamental mechanism of thermal conduction, its mathematical aspects, and certain essential parameters to be considered in this study, such as crystallinity, phonon scattering, or filler/matrix interfaces are discussed in detail.
841 citations
TL;DR: In this article, the authors investigated the effect of three different types of nano-fillers on fracture toughness and failure mechanism of epoxy-based polymer nano-composites, including thermally reduced graphene oxide (TRGO), graphite nano-platelets (GNP), and multi-wall carbon nano-tubes (MWCNT).
450 citations
TL;DR: A survey of the literature on extending performance of epoxy resins based on carbon nanomaterials is presented in this article, where the structure-performance relationships for different carbon-nome material modified epoxy are closely analyzed.
Abstract: Carbon nanomaterials are receiving worldwide attention because of their multi-faceted superiority in thermal conductivity, flame retardancy, mechanical stability, electrical conductivity, and biocompatibility. In this review, a survey of the literature on extending performance of epoxy resins based on carbon nanomaterials is presented. The structure-performance relationships for different carbon nanomaterials modified epoxy are closely analyzed. The performance extension in mechanical, electrical, thermal conductivity, flame retardancy, antidegradation, and tribological properties of epoxy are reviewed in detail. Other application areas including biocompatibility, biodegradability, gas barrier properties, shape memory, and electromagnetic interference shielding are touched. The challenges and opportunities in carbon nanomaterials functionalized epoxy composites are also discussed.
309 citations
TL;DR: In this article, an alternating-current electric field was used to align graphene nanoplatelets (GnPs) in an epoxy polymer, and the resulting nanocomposites exhibit anisotropic properties with significantly improved electrical and thermal conductivities.
277 citations
01 Jun 2018
TL;DR: In this paper, the progress in graphene-polymer composites for electrical applications is discussed and the current optimal composites are presented, and the example of strain sensors is used to demonstrate their application.
Abstract: Electrically conductive composites comprising polymers and graphene are extremely versatile and have a wide range of potential applications. The conductivity of these composites depends on the choice of polymer matrix, the type of graphene filler, the processing methodology, and any post-production treatments. In this review, we discuss the progress in graphene-polymer composites for electrical applications. Graphene filler types are reviewed, the progress in modelling these composites is outlined, the current optimal composites are presented, and the example of strain sensors is used to demonstrate their application.
269 citations