טכניון מכון טכנולוגי לישראל
הטכניון מכון טכנולוגי לישראל - בית הספר ללימודי מוסמכים  
M.Sc Thesis
M.Sc StudentLitvak Barak
SubjectWear Resistant TiSiN Nanostructured Multi-Layer
Coatings on WC-CO
DepartmentDepartment of Materials Science and Engineering
Supervisors Professor Elazar Gutmanas
Dr. Irena Gotman
Full Thesis textFull thesis text - English Version


Abstract

Thin nanocomposite films of TiSiN and TiAlSiN are used successfully as wear resistant coatings on cutting tools. The thickness of these PVD-deposited coatings, however, is limited to 2-3 micrometers since thicker layers often delaminate in service. The goal of this research is to improve the wear performance of TiSiN coatings by incorporation of nanometric metallic interlayers.

TiSiN duplex coatings with up to twenty-four 50 nm-thick Ti interlayers were deposited on WC-Co substrates by Vacuum Cathodic Arc PVD deposition technique. The coatings were characterized in terms of microstructure, internal stresses, nanohardness, adhesion to the substrate and between the sublayers, and resistance to crack propagation.

It has been demonstrated that duplex TiSiN-Ti coatings exhibit superior properties and machining efficiency compared to single-phase TiSiN layers of the same thickness.