Abstract
To obtain a high temperature-resistant microwave absorbing coating, an Al2O3–MoSi2/Cu composite coating was prepared by atmospheric plasma spraying. Compared with a normal temperature environment, there are a few reports on Cu as an absorbent for high temperature microwave absorbing coatings. Therefore, in this regard, wave absorbing property can be improved by using a Cu absorbent. The microstructure of a Al2O3–MoSi2/Cu coating was observed, and the dielectric properties of the composite coating in the high-temperature environment of the X-band were tested. The experimental results show that with the increase in temperature, Cu transforms Cu2O in the high-temperature environment and improves the coating’s wave absorption performance with MoSi2. In addition, a 1.4 mm-thick coating showed best microwave absorbing performance at 700 °C. The reflection loss was −19.09 dB, and the effective microwave absorbing bandwidth was 2.83 GHz (Reflection Loss < −10 dB). It was found that the Al2O3–MoSi2/Cu composite coating has good wave-absorbing performance in a 700 °C high-temperature environment.
Highlights
Recent studies have shown that due to radar detection technology’s rapid development, an increasing amount of attention has been paid to radar stealth technology research.an increasing number of researchers have investigated high-temperature microwave absorbing materials [1,2,3,4,5,6,7,8,9]
An Al2 O3 –MoSi2 /Cu coating was prepared by the atmospheric plasma spraying method, and its high temperature microwave absorbing performance tested in the X-band
In the formula, f represents the frequency of the electromagnetic wave, represents the speed of the elec(c) d represents the thickness of the material, c(d) tromagnetic wave upropagation under vacuum, and j is an imaginary unit
Summary
Recent studies have shown that due to radar detection technology’s rapid development, an increasing amount of attention has been paid to radar stealth technology research.an increasing number of researchers have investigated high-temperature microwave absorbing materials [1,2,3,4,5,6,7,8,9]. The high-temperature absorbing coating prepared by the plasma spraying method has good absorbing performance [10,11,12,13]. MoSi2 are widely used in high-temperature resistant coatings due to their excellent hightemperature resistance [14,15,16]; Cu is rarely studied in a high-temperature environment as an absorbing material. This research used MoSi2 –30Al2 O3 as raw a material, prepared a MoSi2 –Al2 O3 electrothermal coating by atmospheric plasma spraying, and studied the electrothermal properties of the composite coating [18]. Shang et al [19] prepared MoSi2 /BC porous composite microwave absorbing material by the solid-phase sintering method and found that it had good absorbing performance. Wu et al [21] prepared MoSi2 /Al2 O3 coatings with different MoSi2 contents by atmospheric plasma spraying; it was found that with the increase in MoSi2 content, the electrical conductivity and dielectric loss of the coatings increased
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