Microstructure and mechanical properties of CVD TiN/TiBN multilayer coatings

Publikationen: Beitrag in FachzeitschriftArtikelForschung(peer-reviewed)

Externe Organisationseinheiten

  • CERATIZIT Austria GmbH

Abstract

Application of a multilayered coating architecture based on two alternating hard materials provides a strategy to enhance the mechanical properties of hard coatings for the metal cutting industry. Within this work, the mechanical behavior of CVD TiN/TiBN multilayer coatings was correlated with their microstructure and compared to the respective single-layers. Multilayers with different bilayer periods (1400, 800, 300 and 200 nm)were prepared in an industrial-scale thermal CVD plant by alternate variation of the feed gas composition. Complementary X-ray diffraction, Raman spectroscopy and transmission electron microscopy investigations confirmed a dominating face-centered cubic TiN structure, accompanied by hexagonal TiB 2 and amorphous TiB in the B containing coatings. The addition of B and a decreasing bilayer period resulted in a decreasing grain size and increasing hardness. Micromechanical bending tests revealed an increase of strength and fracture toughness with addition of B and increasing layer number. While the highest strength was observed in a TiBN single-layered coating, the multilayered TiN/TiBN with a bilayer period of 200 nm was the hardest and at the same time toughest of the investigated coatings.

Details

OriginalspracheEnglisch
Seiten (von - bis)311-319
Seitenumfang9
FachzeitschriftSurface & coatings technology
Jahrgang370.2019
AusgabenummerJuly
DOIs
StatusVeröffentlicht - 25 Jul 2019