Abstract
Abstract Atmospheric plasma spraying (APS) technique is employed to prepare Fe-based amorphous coatings on T91 steel substrate under various arc powers of 30 kW, 35 kW and 40kW. The morphology and microstructure of both Fe-based powders and amorphous coatings are characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). In addition, the wear resistance and high-temperature oxidation resistance of the plasma-sprayed coatings at various arc powers are studied. It is found that with increasing the arc power, the content of the porosity and the amorphous phase in the coatings declines. Specifically, under 30 kW, 35 kW and 40 kW arc power, the porosity of the coatings is 7.96%, 6.13% and 5.75%. Correspondingly, the relative content of amorphous phase from the coatings is measured to be 96.07% (mass fraction), 73.89% and 65.54%. Moreover, under 40 kW arc power, it gives the coating the highest micro-hardness having more compact microstructure and more dispersive α-Fe grains. Besides, the coatings fabricated at high arc power exhibit less wear induced weight loss and less weight gain from high-temperature oxidation comparing with those fabricated at lower arc power.
Highlights
Atmospheric plasma spraying (APS) technique is employed to prepare Fe-based amorphous coatings on T91 steel substrate under various arc powers of 30 kW, 35 kW and 40kW
The coatings fabricated at high arc power exhibit less wear induced weight loss and less weight gain from hightemperature oxidation comparing with those fabricated at lower arc power
The results show that the corrosion resistance of Fe-Si nano-particle composite coating (FSN) was improved compared with that of Fe-Si micro-particle composite coating (FSM)
Summary
Abstract: Atmospheric plasma spraying (APS) technique is employed to prepare Fe-based amorphous coatings on T91 steel substrate under various arc powers of 30 kW, 35 kW and 40kW. The wear resistance and hightemperature oxidation resistance of the plasma-sprayed coatings at various arc powers are studied. In order to proliferate the application of Fe-based amorphous alloys, thermal spraying technique is applied as potential fabrication technique for amorphous coatings considering the feature of rapid cooling [11, 12]. Fe-based amorphous powder was used as the spraying feedstock, and atmospheric plasma spraying (APS) system was used to deposit the Fe-based alloy coatings. The microstructure, wear behavior, and hightemperature oxidation resistances of Fe-based amorphous coatings were investigated with samples deposited under different arc powers. Parameters Spraying powers (kW) Spraying distance (mm) Powder feed rate (g/min) Primary gaspressure (Ar), MPa Auxiliary gas pressure (H2), Primary gas flow (L/min) Auxiliary gas flow (L/min)
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