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@PHDTHESIS{Schulz:983416,
      author       = {Schulz, Marvin},
      othercontributors = {Bobzin, Kirsten and Oechsner, Matthias},
      title        = {{M}etallisch dichtende {B}eschichtungen im {A}rmaturenbau},
      volume       = {79},
      school       = {RWTH Aachen University},
      type         = {Dissertation},
      address      = {Düren},
      publisher    = {Shaker Verlag},
      reportid     = {RWTH-2024-03413},
      isbn         = {978-3-8440-9430-5},
      series       = {Schriftenreihe Oberflächentechnik},
      pages        = {1 Online-Ressource : Illustrationen},
      year         = {2024},
      note         = {Druckausgabe: 2024. - Auch veröffentlicht auf dem
                      Publikationsserver der RWTH Aachen University; Dissertation,
                      RWTH Aachen University, 2023},
      abstract     = {In almost all industrial sectors, valves are used for the
                      regulation of various media flows, which is why the valve
                      production is one of the most important economic sectors in
                      Germany. However, the valve market is highly competitive.
                      New types of coatings offer the possibility to increase
                      economic efficiency and competitiveness. In this thesis, two
                      concepts are presented for increasing the economic
                      efficiency and competitiveness through the development of
                      thermally sprayed valve coatings. On the one hand, solid
                      lubricants are integrated into established wear protective
                      coatings that are commonly used in valves, and on the other
                      hand, valve coatings that require less post-processing steps
                      are developed. Valves are usually controlled by an actuator,
                      whereby energy is lost in the form of heat during each
                      switching operation. By integrating graphite and hexagonal
                      boron nitride, friction and wear are reduced compared to
                      conventionally used valve coatings. By the use of powders
                      with a finer particle size distribution, near-net-shape
                      coatings have been developed in which the necessary surface
                      quality is achieved by direct polishing, without the need
                      for the cost-intensive grinding process. Abrasion resistance
                      tests show that the developed coatings have a higher wear
                      resistance than conventionally used valve coatings. In the
                      case of solid lubricant containing coatings this increased
                      resistance is attributed to the reduction of shear stresses
                      due to the solid lubricants and in the case of the fine
                      powder coatings due to the higher cohesion of the coating
                      and the more finely dispersed carbides. Electrochemical
                      corrosion, erosion and cavitation tests show that the
                      integration of solid lubricants reduces these resistances.
                      The reason for this is the low cohesion of the solid
                      lubricants and the additionally introduced paths at which
                      the electrolyte can infiltrate the coating. However, a
                      sufficient resistance can be achieved through a process
                      development and the integration of finer solid lubricants.
                      Due to the dense coating structure, the near-net-shape
                      coatings exhibit a higher resistance to erosion, cavitation
                      and corrosion compared to conventionally used valve coatings
                      under the investigated test conditions. A demonstrator test
                      qualified the most promising solid lubricant containing
                      coating for the use in the valve industry.},
      cin          = {419010},
      ddc          = {620},
      cid          = {$I:(DE-82)419010_20140620$},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      doi          = {10.18154/RWTH-2024-03413},
      url          = {https://publications.rwth-aachen.de/record/983416},
}