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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},
}
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