Friction–Wear Characteristics of High Velocity Oxygen Fuel Sprayed NiCrBSi Alloy Coating at Elevated Temperatures

2018 ◽  
Vol 71 (10) ◽  
pp. 2565-2573 ◽  
Author(s):  
Wen Zhao ◽  
Benguo Zhao ◽  
Dejun Kong
Keyword(s):  
High Velocity ◽  
Elevated Temperatures ◽  
Alloy Coating ◽  
High Velocity Oxygen Fuel ◽  
Wear Characteristics ◽  
Oxygen Fuel

Optimizing the Substrate Preheating Process of High Velocity Oxygen Fuel Cobalt-Based Alloy Coating on Alloyed and Carbon Steels Mechanical Properties

2018 ◽  
Vol 929 ◽  
pp. 142-149 ◽  
Author(s):  
Myrna Ariati Mochtar ◽  
Wahyuaji Narottama Putra ◽  
Raditya Perdana Rachmansyah
Keyword(s):  
Wear Resistance ◽  
High Velocity ◽  
Alloy Coating ◽  
Carbon Steels ◽  
Surface Heating ◽  
Initial Surface ◽  
High Velocity Oxygen Fuel ◽  
Alternative Material ◽  
Substrate Preheating ◽  
Oxygen Fuel

Tube boiler operating condition initiates common problems that can occur as a problem in the wear resistance material. It leads to a decreased function of the material so that it is necessary to repair or replacement. High Velocity Oxygen Fuel (HVOF) is regarded as one of the effective methods to increase the wear resistance of the material. In this study, the materials were ASTM SA213-T91 as a material commonly used for boiler tube and JIS G 3132 SPHT-2 as an alternative material. In the early stages, both of specimens were given initial surface heating with temperature variations 0, 50, 100 and 150oC. The materials were then coated with Stellite-1 using HVOF method. The material were then characterized for the microstructure, porosity, hardness distribution, and wear resistant. The results showed that the coating Stellite-1 as a top coat with HVOF method can improve the performance of the material. Microhardness increases from 220 HV to 770 HV on ASTM SA213-T91, while on the substrate JIS G 3132 SPHT-2 the microhardness increased from 120 HV to 750 HV. Better wear resistance was achieved with increasing preheating [1]. Wear resistance of the materials increased from the range 3.69x10-7at 0°C preheating up to 0.89x10-7on a specimen with initial surface heating 150oC. Porosity also decreases with the increasing preheating temperature.

Effects of Al Addition on Microstructure and Wear Resistance of High-Velocity-Oxygen-Fuel-Sprayed FeCoNiCrMn High Entropy Alloy Coating

2019 ◽  
Vol 11 (5) ◽  
pp. 685-693 ◽  
Author(s):  
Zhidan Zhou ◽  
Xiubing Liang ◽  
Yongxiong Chen ◽  
Baolong Shen ◽  
Junchao Shang ◽  
...  
Keyword(s):  
Wear Resistance ◽  
High Velocity ◽  
Alloy Coating ◽  
High Entropy Alloy ◽  
High Velocity Oxygen Fuel ◽  
High Entropy ◽  
Al Addition ◽  
Oxygen Fuel

scholarly journals The Effect of Heat Treatment on the Corrosion Resistance of Fe-Based Amorphous Alloy Coating Prepared by High Velocity Oxygen Fuel Method

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7818
Author(s):  
Chun-Ying Lee ◽  
Hung-Hua Sheu ◽  
Leu-Wen Tsay ◽  
Po-Sen Hsiao ◽  
Tzu-Jing Lin ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Corrosion Resistance ◽  
Amorphous Alloy ◽  
High Velocity ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
Alloy Coating ◽  
Corrosion Current ◽  
High Velocity Oxygen Fuel ◽  
Oxygen Fuel

In this study, Fe40Cr19Mo18C15B8 amorphous coatings were prepared using high velocity oxygen fuel (HVOF) technology. Different temperatures were used in the heat treatment (600 °C, 650 °C, and 700 °C) and the annealed coatings were analyzed by DSC, SEM, TEM, and XRD. XRD and DSC results showed that the coating started to form a crystalline structure after annealing at 650 °C. From the SEM observation, it can be found that when the annealing temperature of the Fe-based amorphous alloy coating reached 700 °C, the surface morphology of the coating became relatively flat. TEM observation showed that when the annealing temperature of the Fe-based amorphous alloy coating was 700 °C, crystal grains in the coating recrystallized with a grain size of 5–20 nm. SAED analysis showed that the precipitated carbide phase was M23C6 phase with different crystal orientations (M = Fe, Cr, Mo). Finally, the corrosion polarization curve showed that the corrosion current density of the coating after annealing only increased by 9.13 μA/cm2, which indicated that the coating after annealing treatment still had excellent corrosion resistance. It also proved that the Fe-based amorphous alloy coating can be used in high-temperature environments. XPS analysis showed that after annealing FeO and Fe2O3 oxide components increased, and the formation of a large number of crystals in the coating resulted in a decrease in corrosion resistance.

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