Alumina-titania coatings are widely used in industry for wear, abrasion or corrosion protection components. Such layers are commonly deposited by atmospheric plasma spraying (APS) using powder as feedstock. In this study, both Al2O3 and Al2O3-13 wt% TiO2 coatings were deposited on austenitic stainless steel coupons by suspension plasma spraying (SPS). Two commercial suspensions of nanosized Al2...

A vacuum microplasma spray system, operating on gross power levels of 1-3 kW, with powder feed rates below 1 g/min and using plasma gas mixtures of argon and hydrogen, was built and tested. In order to improve the deposition efficiency and quality of coatings, the system was analyzed and the matter of particle entrainment into the plasma jet core was identified as a critical sub-process. Partic...

There is currently a lack of suitable methods non-destructive quality assessment thermally sprayed coatings. Therefore, this study investigates the suitability polarization measurements that are adapted to special needs coatings for testing. For purpose, gel electrolyte containing 3.5% NaCl and measuring cell based on three-electrode arrangement were developed prevent corrosion medium from infi...

High-entropy alloys (HEAs) are promising structural materials due to their excellent comprehensive performances. The use of mechanically alloyed powders to deposit HEA coatings through atmospheric plasma spraying (APS) is an effective approach that can broaden the application areas of the HEAs. In this paper, a ductility-brittleness AlCoCrFeNiSi system was chosen as an object of study, and the ...

The fluorination of Yttria (Y2O3) coatings in the inner chamber wall a plasma-etching equipment causes process drift. In this paper, we investigate relationship between microstructure and fluoride layer Y2O3 prepared by aerosol deposition (AD) method compared with atmospheric plasma spraying (APS) ion plating (IP). corrosion AD-coating, which has highly dense without any pores, proceeded homoge...

The behavior modeling of Atmospheric Plasma Spray (APS) process requires a global approach which considers interrelated non-linear relationships between coating characteristics / properties in-service and process parameters (power, feedstock injection, kinematics, etc.). Such an approach would permit to reduce the development costs. To reach this objective, the knowledge of the interactions bet...

In this research, Cr2O3 ceramic nano-sized powder particles were prepared using ball milling and then granulated to reach the proper size for spraying. Afterward, nano-coatings deposited by atmospheric plasma spraying (APS) process onto stainless steel substrates. To optimize APS parameters, was carried out under six conditions with different parameters. Microstructures of elemental/milled coat...

Numerous cracks can be observed in the top coat of thermal barrier coatings (TBCs) deposited by the atmospheric plasma spraying (APS) method. These cracks can be classified into vertical and horizontal ones and they have opposite impact on the properties of TBCs. Vertical cracks reduce the residual stress in the top coat and provide strain tolerance. On the contrary, horizontal cracks trigger d...

Environmental barrier coatings (EBCs) protect SiC/SiC ceramic matrix composites from steam oxidation. Yb2Si2O7 is a promising material for the top coating of EBCs. However, thermal shock and foreign object debris can cause cracks on surface an EBC, thereby reducing its ability to overcome environmental barriers. It has been found that EBC be strengthened by adding SiC coating; this addition hea...

As a potential accident-tolerant fuel cladding material, we studied the method of preparing FeCoNiCrMo coatings on zircaloy-4 substrates by atmospheric plasma spraying (APS) technology to explore high-temperature oxidation behavior at 1100 °C in steam. Various surface analysis techniques such as X-ray diffraction, electron probe microanalysis, and scanning microscopy were used analyze phase com...