Mechanical property of Fe-base metallic glass coating formed by gas tunnel type plasma spraying

A Solid State Approach to Synthesis Advanced Nanomaterials for Thermal Spray Applications

“…Movahedi, et al reported that the microhardness value of HVOF coatings are all have a high hardness of around 800 to 1200 HV. The value of hardness was similar to that of the bulk Febased metallic glass (Kobayashi et al;2008) but it was higher than that of electroplated chromium and the Ni-based amorphous coatings (Ni et al;. The difference in hardness v a l u e o f t h e t h r e e g r o u p s o f H V O F c o a t i n g s w e r e d e v e l o p e d b y M o v a h e d i , e t a l .…”

“…They suggested that this difference may result from the difference of the cooling rate between the APS and HVOF processes. It is regarded that the composition chosen by Movahedi, et al satisfies the three empirical rules (Pang et al; for the stabilization of the super-cooled liquid during HVOF and plasma spraying, leading to highly dense random packed atomic configurations, higher viscosity, and lower atomic diffusivity (Kobayashi et al;2008) which is primarily attributed to the high GFA.…”

High Chromium Fe-Cr-Mo-P-C Amorphous Coating Films Produced by Thermal Spraying Technique

“…Because of the cheaper method compared to other conventional ones such as the vacuum evaporation method, the amorphous alloy coating films by the thermal spraying method can be applied to the wide range of industrial applications. [1][2][3][4] High chromium Fe-Cr based amorphous alloys containing about 35 at% Cr have excellent high hardness and high corrosion resistance, [5][6][7][8] however, the alloys exhibit the high melting temperatures of about 1000 C and above. Consequently, the high chromium Fe-Cr-based amorphous alloys have not yet been well produced by previous thermal spraying methods.…”

“…The important problems in these methods may be due to the contamination of oxides and the density of pores in the thermal sprayed films. 1,2,[9][10][11][12][13] Recently, there are some research papers that were able to inhibit the oxide formation by the shield nozzle installed at the front end of the atmospheric plasma spray gun or the high velocity oxygen fuel gun. 14,15) In our previous study, we have developed the Fe 70 Cr 10 P 13 C 7 amorphous coating films produced by our developed thermal spraying gun with the cylindrical nozzle.…”

Formation of Fe-Based Amorphous Coating Films by Thermal Spraying Technique

“…[1][2][3][4] Especially, Fe-Cr based amorphous alloys have high hardness and high corrosion resistance. [5][6][7][8] However, the Fe-Cr based amorphous alloys having high melting temperatures of about 1000 C have not yet been well produced by previous thermal spraying methods.…”