Influence of Substrate Temperature on the Structure and Cohesive/Adhesive Strength of Fe–Co–Si–B–Nb Metallic Glass Coating Films Produced by Thermal Spraying

Abstract

The influence of the substrate temperature on the structure, pore distribution and cohesive/adhesive strength of FeCo-based metallic glass coating films has been examined. The metallic glass coating films have been produced by a thermal spraying technique using our developed cylindrical nozzle on SS400 substrates. The splat morphology of the sprayed particles changed from an irregular splash to a disk shape at a transition temperature of about 300°C. When the substrate temperature increased to the transition temperature region (300323°C), the porosity in the boundaries between the sprayed coating films and the substrates decreased. This can be produced by the strong increase in the wettability of the sprayed particles which is accompanied with a morphological change from splashed to disk-shaped particles. At temperatures ranging from 375 to 400°C, the porosity in both the boundary and inside regions decreased, and the volume fraction of the amorphous phase increased with temperature, resulting in a increase in the cohesive/adhesive strength up to about 27 MPa.

Prevention of Hydrogen Embrittlement Using Ultra Rapid Cooling Thermal Spraying Gun

“…Additionally, little oxidization is also expected to be obtained. 24,25) Because the elongation of the coated bolt was greater than that of the naked bolt, it was confirmed that less hydrogen embrittlement occurred in the coated bolt than in the naked bolt as shown in Fig. 7.…”

Influence of Heat Treatment on the Microstructure and Wear Properties of Arc-Sprayed FeCrAl/Al Coating

“…The adhesion strength slightly improved because of the increase in temperature, which affected the sprayed particles along the interface. Komaki et al [31,32] stated that the structure of particles and pores along the coating-substrate interface affect the adhesion strength. An increase in temperature improved the wettability of particles along the interface, thus improving the bonding of splat particles.…”

Synthesis of Co-based Metallic Glass Coatings by Pneumatic Squeezing Method

“…Sonuç olarak altlık malzemesi olarak kullanılan aluminyum ve çelik plakaların yüzey sertlikleri, yüzeylerine kaplanan amorf tabaka sayesinde yaklaşık 1000 Hv sertlik değerine yükselmiştir. Ölçülen sertlik değeri Komaki ve ark.nın termal spreyleme yöntemi ile ürettikleri CoFe-esaslı kaplama ile uyumludur [Komaki M. Et al. , 2012].…”