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Baumann, 2012

Titel Hochverschleißfeste und konturnahe Werkzeugoberflächen durch Hochgeschwindigkeitsflammspritzverfahren
Autor/Autorin Baumann, Ingor-Theodor
Verleger Essen : Vulkan-Verl.
Erscheinungsjahr 2012
Gesamttitel Werkstofftechnologische Schriftenreihe ; Bd. 5
Hochschulschrift Zugl.: Dortmund, Techn. Univ., Diss., 2012
ISBN 978-3-8027-8813-0
Sprache Deutsch (ger)
Schlagwörter Konstruktionselement ; Verschleißschutz ; Wolframcarbide ; Cobalt ; Pulver ; Nanostrukturiertes Material ; Hochgeschwindigkeitsflammspritzen ; Endabmessungsnahe Fertigung
Bezugsquelle 31,50 € beim Vulkan-Verlag


Nanomaterials represent a novel and promising class of materials for future applications. In contrast to conventional materials, nanomaterials of the same chemical composition can provide significantly improved or enhanced structural and functional properties. This phenomenon is attributed to scaling effects of the material. Against this background, the research in nanomaterials has also attracted increasing interest in the Thermal Spray technology. Within the field of wear protection, the application of fine or nanostructured WC-Co feedstock powders in the High Velocity Oxy-Fuel flame spraying technique (HVOF) provides novel possibilities for the manufacturing of cermet coatings with improved mechanical and tribological characteristics.

In this work the processing of fine and nanostructured WC-12Co feedstock powder by means of a novel HVOF-technique is fundamentally investigated and the results are compared to those obtained with conventional powders. In addition, a holistic concept for the near net shape coating of regular shaped components is introduced. First of all, a comprehensive parameter study based on the statistical design of experiments (DOE) is carried out to optimize the spray process and the corresponding coating systems. In the next step, the impact of process parameter- and scaling effects on the process dynamics and the thermo-kinetic particle behavior in the flame, as well as on the mechanical coating properties, the microstructure, the behavior of elements an phases an on the residual stress is comprehensively discussed. The analysis comprises also the ascertainment of explanatory approaches, in particular how scaling effects can lead to advantages or disadvantages with respect to the process and the coatings. Following these analyses, the tribological behavior of the developed conventional, fine- and nanostructured WC-12Co coatings under sliding and rolling wear is scrutinized and the results are compared to those of the C45 substrate material. The last part of this work deals with the possibilities of the robot-assisted near-net shape coating of real components with a regular geometric shape. Therefore, the influence of important handling parameters on the coating application, the coating properties and on the heating of the components is analyzed. In the final step, the robot-assisted near net shape coating of regular shaped components with different exterior angles using offline programmed path planning is investigated to transfer the so gained fundamentals into practice.



Foto von Dr.-Ing. Ingor Baumann

Dr.-Ing. Ingor Baumann

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