Material with high-temperature wave-absorbing and heat-insulating coating and preparation method thereof

The invention discloses a material with a high-temperature wave-absorbing heat-insulating coating and a preparation method thereof, and belongs to the technical field of wave-absorbing materials. The material with the high-temperature wave-absorbing and heat-insulating coating, provided by the invention, is prepared by mechanically mixing lanthanum magnesium aluminum oxide (LAMA) powder and samarium iron nitrogen (SmFeN) powder and then spraying the mixed powder on the surface of a plate in a plasma spraying manner. Under the condition from the room temperature to the high temperature (20-990 DEG C), the reflectivity is in the frequency band range of 8-12 GHz, and under the condition that the thickness is small, the wave absorbing performance and the heat insulating performance are still good. According to the material and the preparation method disclosed by the invention, the process steps are simple, harmful and toxic pollutants are not generated in the process, and the environmental compatibility is good.