Skip to content
  • Newsletter
  • About us
  • Contact
  • EN
  • DE
Menu
  • Newsletter
  • About us
  • Contact
  • EN
  • DE
Search
Close
  • Overview
  • Research
  • Here & now
  • Smart minds
Menu
  • Overview
  • Research
  • Here & now
  • Smart minds
  • Overview
  • Research
  • Here & now
  • Smart minds
  • Contact
  • Newsletter
  • About us
Menu
  • Overview
  • Research
  • Here & now
  • Smart minds
  • Contact
  • Newsletter
  • About us
Search
  • EN
  • DE
8. May 2019

Innovative process combination for substrate bonding of thermally sprayed coatings

IW | Corundum blasting used as a pre-treatment of coating surfaces is more and more replaced by machining processes. Researchers are developing an innovative combination of processes for the form-locked bonding of thermally sprayed coatings.

Scientists from the Institute of Materials Science (IW) and the Institute of Machining Technology (ISF) are designing novel surface structures which can reach the adhesive tensile strength required for thermally sprayed coatings without the need of a blasting process. For this purpose, a wave structure is applied to the surface of a steel shaft using a knurl milling process. Since the knurled wave structure alone cannot guarantee the required bonding quality, a rolling process is used afterwards to apply undercuts at the surface, thus improving the mechanical bonding of the coatings sprayed onto the substrate. Moreover, the spraying parameters and the post-treatments for the sprayed coatings are adapted to the new challenge.

by Manuel Rodriguez Diaz, Kai Möhwald, Florian Vogel, Dirk Biermann

Similar posts

  • Process-reliable definition of subsurface properties
  • Experiments for simulating wet welding under water
  • More durable implants by coatings with capillary texture

Benefits derived from research results

  • No extra costs for blasting system and compressed air
  • No particulate pollution at workplaces due to abrasives
  • Tailored surface structures
  • Less post-treatment
  • Reduction of coating porosity
IW_Spanende_Fertigungsverfahren_Bild1_01
The existing substrate bonding mechanisms are important for the quality of thermally sprayed coatings. (Photo: IW)
IW_Spanende_Fertigungsverfahren_Bild2_01
The aim is to substitute corundum blasting, an established process for the pre-treatment of coating surfaces, by machining processes. (Photo: ISF, IW)
IW_Spanende_Fertigungsverfahren_Bild3_01
But knurled structures alone cannot provide the mechanical bonding required to compete against corundum blasting successfully. (Photo: ISF, IW)
IW_Spanende_Fertigungsverfahren_Bild4_01
Rolling of the wave structure produces undercuts on the surface, thus improving the adhesive tensile strength considerably. (Photo: ISF, IW)
IW_Spanende_Fertigungsverfahren_Bild5_01
Due to the symmetrical arrangement of the undercuts and the post-treatment of the coating by deep rolling, adhesive tensile strength measurements reach nearly the same level as with corundum-blasted specimens. (Photo: ISF, IW)
Previous
Next

Contact

Dipl.-Ing. Manuel Rodriguez Diaz

(02302) 661-652

rodriguez@iw.uni-hannover.de

www.iw.uni-hannover.de

This Page

drucken

recommend

  • tweet 

Similar posts

  • Process-reliable definition of subsurface properties
  • Experiments for simulating wet welding under water
  • More durable implants by coatings with capillary texture

This Page

drucken

recommend

  • tweet 

ISSN 2198-1922 | Legal Information | Privacy notice | Article Sitemap