Chemische Entschichtung von Hartmetallen

Translated title of the contribution: Chemical decoating of hard metals

Gregor Kücher

Research output: ThesisMaster's Thesis

959 Downloads (Pure)

Abstract

The objective of this thesis is the increase of the quality of the hard metal-scrap recycled via the zinc process. The direct recycling of these scraps only allows the disintegration through deterioration of the binder by formation of an intermetallic compound with zinc. Subsequent the zinc is removed via vacuum distillation and the recycled material obtained is in powder form. Finally the reapplication as a raw material for the production of new hard metals is provided. However, incorporated contaminations as well as coating materials remain in the recyclate. Based on a literature and patent survey, the selection of an appropriate solution for the removal of the hard coating took place. Empirical models were developed by a program for the generation and evaluation of model-based experimental designs. By considering the obtained results a selection of a suitable parameter-region for decoating of the examined cutting inserts is possible. An insight of the decoating-reaction is achieved besides the assignment. All obtained data constitute a promising issue for a pretreatment step of the zinc process for an improvement of the recyclate free of coating material.
Translated title of the contributionChemical decoating of hard metals
Original languageGerman
QualificationDipl.-Ing.
Supervisors/Advisors
  • Ebner, Tamara, Co-Supervisor (internal)
  • Luidold, Stefan, Supervisor (internal)
Award date27 Mar 2015
Publication statusPublished - 2015

Bibliographical note

embargoed until 10-02-2020

Keywords

  • chemical recycling
  • hard metals
  • hard metal recycling
  • coating
  • CVD
  • PVD
  • TiN
  • TiAlN
  • CrN
  • zinc process
  • tungsten
  • direct recycling

Cite this