Mechanical behavior of (Ti,Al)N coatings exposed to elevated temperatures and an oxidative environment

Evaluation of the effect of boride layer structure on the high temperature wear behavior of borided steels

“…Unlike tensile thermal stress, compressive thermal stress is beneficial in retardation of crack initiation and/or propagation at surface layer [3,7]. In this respect, a number of scientific investigations have been made to control the thermal stress by altering the structure of the surface layers (multilayered, gradient and composite nature) formed by deposition techniques [4][5][6][8][9][10][11][12][13]. When thermochemical diffusion processes are of concern, boriding results in the formation of single (Fe 2 B) or dual-phase (Fe 2 BþFeB) surface layers on ferrous alloys depending on the process parameters [14,15].…”

Metal ion release from TiN coated CoCrMo orthopedic implant material

“…3 shows the load -cartridge output curves recorded during scanning scratch tests on the same TiN coated specimen and demonstrates the scratch resistance behavior of the TiN film on the CoCrMo substrate alloy (a total of three scratch profiles obtained from the same TiN coated specimen). In theses curves, a sudden increase in cartridge output (referring to the transducer output voltage [13]) is related to damage of the coating and thus to the critical load, where the coating fails. Also included in the same figure are the SEM results of a typical scratch produced on the surface of the TiN coated CoCrMo sample.…”

“…More details of the scratch tester and critical load measuring principles can be found in Ref. [13]. The scratch testing parameters used in this study were the following: full test force 196 mN, loading speed 5 Am/s, and scratch speed 20 Am/s.…”

A complete qualification methodology for coatings of precision glass molding tools

“…Oxidation and evaluation of the results is performed using different techniques: annealing in nitrogen/air and comparison of mechanical properties in 5 and 6 , annealing in air or vacuum and comparison of roughness in 15 and 16 , measurement of residual stresses after oxidation in air in 17 , heating in air and investigation of structure and composition after heating tests in 18 , laser surface treatment in air and its effect on roughness and hardness in 19 . In these papers, we learn about the oxidation resistance of various coatings, but the effect this has on glass molding is not investigated, since no experiments with glass contact are performed.…”