Microstructure and Property of MoSi2-30Al2O3 Electrothermal Coating Prepared by Atmospheric Plasma Spraying

Abstract

With MoSi 2-30Al 2 O 3 mixed powders as the raw material, MoSi 2-30Al 2 O 3 electrothermal coating was sprayed by atmospheric plasma spraying technology. The phase composition, microstructure and thermal stability of the coating were systematically studied by XRD, SEM, electrical test and differential thermal gravity analysis. The results show that MoSi 2-30Al 2 O 3 electrothermal coating shows dense microstructure. Al 2 O 3 can improve the electrical resistivity and oxidation resistance of MoSi 2 materials in low temperature. The coating exhibits an excellent electrical-heating performance. In the heating cycle test, it could be heated to 320 ℃ stably and exhibit uniform thermal distribution in the surface area. The temperature variation in roll's central area can be controlled within 25 ℃; Oxidation and thermal stress relaxation during heating cycle would generate cracks and pores in the coating which would increase electrical resistivity.

Property of TiO2-15MgAl2O4 Electrical-Heating Coating Prepared by Atmospheric Plasma Spraying and Hydrogen Heat Treatment

“…From the temperatures shown, it can be seen that the surface temperature of the heating pipe is relatively uniform. The temperature difference in the middle of the pipe is no more than 20 • C. The temperature difference between the edges and middle of the pipe is mainly due to the heat loss by thermal radiation and convection [22,32]. Figure 6a shows the pipe sample of TM15 electrical-heating coating.…”

“…The temperature difference in the middle of the pipe is no more than 20 °C. The temperature difference between the edges and middle of the pipe is mainly due to the heat loss by thermal radiation and convection [22,32]. Figure 7 shows the temperature-time curve of TM15 coating tested by five cycles of electrification.…”

Effect of Temperature on the Microwave-Absorbing Properties of an Al2O3–MoSi2 Coating Mixed with Copper

“…Researchers have carried out in-depth studies on the wave absorption performance and high-temperature oxidation of MoSi 2 . This research used MoSi 2 -30Al 2 O 3 as raw a material, prepared a MoSi 2 -Al 2 O 3 electrothermal coating by atmospheric plasma spraying, and studied the electrothermal properties of the composite coating [18]. Shang et al [19] prepared MoSi 2 /BC porous composite microwave absorbing material by the solid-phase sintering method and found that it had good absorbing performance.…”