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Microwave Absorbing Mortar Using Magnetic Hollow Fly Ash Microspheres/Fe3O4 Composite as Absorbent

He, Yongjia / Cui, Yaqing / Lu, Linnu / Wang, Fazhou / Hu, Shuguang

A new type of microwave absorption cement-based material was prepared by using a magnetic hollow fly ash microspheres $(HFAM) / {Fe}_{3} O_{4}$ composite as the absorbent. Through the chemical precipitation method, a nano- ${Fe}_{3} O_{4}$ layer was coated on the surface of HFAM to obtain the $HFAM / {Fe}_{3} O_{4}$ composite. Then the composite was added into mortar to prepare microwave absorption cement-based material. The mineral components, micromorphology, and electromagnetic parameters of the $HFAM / {Fe}_{3} O_{4}$ composite and the reflection loss of the cement-based material were investigated. It was found that the $HFAM / {Fe}_{3} O_{4}$ composite had superparamagnetism, and its saturation magnetization and the residual magnetization were $32.67 emu / g$ and almost zero, respectively. The best microwave absorption of the cement-based material was obtained at 3% $HFAM / {Fe}_{3} O_{4}$ composite to cement, of which the bandwidth of the reflection loss lower than $- 10 dB$ (responding to 90% microwave absorption) was nearing 8 GHz, showing excellent microwave absorption performance.

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Microwave Absorbing Mortar Using Magnetic Hollow Fly Ash Microspheres/Fe3O4 Composite as Absorbent

He, Yongjia / Cui, Yaqing / Lu, Linnu / Wang, Fazhou / Hu, Shuguang

A new type of microwave absorption cement-based material was prepared by using a magnetic hollow fly ash microspheres $(HFAM) / {Fe}_{3} O_{4}$ composite as the absorbent. Through the chemical precipitation method, a nano- ${Fe}_{3} O_{4}$ layer was coated on the surface of HFAM to obtain the $HFAM / {Fe}_{3} O_{4}$ composite. Then the composite was added into mortar to prepare microwave absorption cement-based material. The mineral components, micromorphology, and electromagnetic parameters of the $HFAM / {Fe}_{3} O_{4}$ composite and the reflection loss of the cement-based material were investigated. It was found that the $HFAM / {Fe}_{3} O_{4}$ composite had superparamagnetism, and its saturation magnetization and the residual magnetization were $32.67 emu / g$ and almost zero, respectively. The best microwave absorption of the cement-based material was obtained at 3% $HFAM / {Fe}_{3} O_{4}$ composite to cement, of which the bandwidth of the reflection loss lower than $- 10 dB$ (responding to 90% microwave absorption) was nearing 8 GHz, showing excellent microwave absorption performance.

Microwave Absorbing Mortar Using Magnetic Hollow Fly Ash Microspheres/Fe3O4 Composite as Absorbent

He, Yongjia / Cui, Yaqing / Lu, Linnu / Wang, Fazhou / Hu, Shuguang

A new type of microwave absorption cement-based material was prepared by using a magnetic hollow fly ash microspheres $(HFAM) / {Fe}_{3} O_{4}$ composite as the absorbent. Through the chemical precipitation method, a nano- ${Fe}_{3} O_{4}$ layer was coated on the surface of HFAM to obtain the $HFAM / {Fe}_{3} O_{4}$ composite. Then the composite was added into mortar to prepare microwave absorption cement-based material. The mineral components, micromorphology, and electromagnetic parameters of the $HFAM / {Fe}_{3} O_{4}$ composite and the reflection loss of the cement-based material were investigated. It was found that the $HFAM / {Fe}_{3} O_{4}$ composite had superparamagnetism, and its saturation magnetization and the residual magnetization were $32.67 emu / g$ and almost zero, respectively. The best microwave absorption of the cement-based material was obtained at 3% $HFAM / {Fe}_{3} O_{4}$ composite to cement, of which the bandwidth of the reflection loss lower than $- 10 dB$ (responding to 90% microwave absorption) was nearing 8 GHz, showing excellent microwave absorption performance.

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Title:

Microwave Absorbing Mortar Using Magnetic Hollow Fly Ash Microspheres/Fe3O4 Composite as Absorbent

Contributors:

He, Yongjia (author) / Cui, Yaqing (author) / Lu, Linnu (author) / Wang, Fazhou (author) / Hu, Shuguang (author)

Published in:

Journal of Materials in Civil Engineering ; 30

Publication date:

2018-04-12

ISSN:

0899-1561 , 1943-5533

DOI:

https://doi.org/10.1061/(ASCE)MT.1943-5533.0002298

Type of media:

Article (Journal)

Type of material:

Electronic Resource

Language:

Unknown

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