Interdiffusion reaction in the CrN interlayer in the NiCrAlY/CrN/DSM11 system during thermal treatment

Microstructural characteristics and degradation mechanism of the NiCrAlY/CrN/DSM11 system during thermal exposure at 1100 °C

“…The EDS line scanning indicates that Cr-rich phase is concentrated in the center of diffusion barrier and Al-rich phase is formed at the overlayer/DB interface. It was confirmed that the Cr-rich phase was Cr 2 N, which was transformed from CrN and the Al-rich phase was AlN due to the replacement reaction of inward-diffusion Al with CrN during vacuum heat treatment [9]. From the EDS line scanning results, it can also be observed that the Al and Cr elements are distributed non-uniformly in the overlayer and most of Ti was detected in the substrate.…”

“…With the aid of tensile adhesion test, it is found that the interfacial adhesion is about 70 MPa in the annealed MCrAlY/CrN/DSM11 system (herein CrN is as a diffusion barrier), better than that with CrON diffusion barriers. After thermal exposure, the interfacial adhesion of the coating system with the CrN diffusion barrier is further improved to above 80 MPa, which is attributed to the replacement of CrN by TiN in the diffusion barrier [8,9]. However, due to the destruction of continuous CrN barrier layer, the barrier effectiveness will inevitably change and thus the oxidation-resistance will be affected.…”

Influence of Zr alloying on the mechanical properties, thermal stability and oxidation resistance of Cr–Al–N coatings

“…The increasing total power applied to the targets impedes their complete poisoning with the discharge switching from compound to metallic mode, with the consequent decrease in the nitrogen percentage in the deposited films. Such a discharge mode is also influencing significantly the deposition rate, which increases from rather low values of about 10~14.7 nm/min in low Zr coatings up to ~ 44.4 nm/min, when Zr target power density is 6 W/cm 2 (Fig. 1)).…”

“…Cr-N binary coatings have been widely used in many applications due to a good balance among wear, corrosion and mechanical properties [1,2]. Alloying of Al element into coatings can further improve their mechanical properties and oxidation resistance [3,4].…”

A study of the oxidation behavior of CrN and CrZrN ceramic thin films prepared in a magnetron sputtering system

“…CrN ceramic thin films have been widely used in many applications due to its good wear, corrosion and mechanical properties [1,2]. Alloying of Zr element into CrN ceramic thin films has attracted much interest since ZrN film is a protective film due to its high hardness, and high corrosion and wear resistance [3,4].…”