Preparation and Properties of Magnesium Oxysulfide Cement Based Foam Board Absorbing Material

Abstract

In order to better solve the problem of electromagnetic pollution in the civil building cement, to improve the absorption capacity of magnesium oxysulfide cement based materials, and to better use sulfur oxide magnesium cement foamed sheet for improvement of electromagnetic industry, this paper uses the excellent microwave absorbing properties of ferrite and the modified sulfur oxide magnesium cement foam board, and discusses the microwave absorbing performance, aiming at improving the electromagnetic pollution in daily life. The effects of ferrite and silicon carbide doping on microwave absorption properties of modified magnesium oxysulfate cement were studied. At the same time, the wave absorbing properties of the corresponding samples were detected by bow method, and the causes of the corresponding phenomena were analyzed by scanning electron microscopy (SEM). The results show that the lowest reflectance of the material is −17.9 dB at 34.1 GHz and the average reflectance of the whole band is −15.9 dB under the target frequency band of 26.5–40 GHz. Under the action of external magnetic field, the absorbing particles are affected by magnetization force, magnetic dipole and resistance coupling, and play the absorbing effect in the cement base solidified completely in the electromagnetic field environment. The lowest reflectance is −17.3dB at 36.4GHz and the average reflectance is −14.3dB for the whole band.

Keywords

magnesium oxysulfide cement / silicon carbide / ferrite / absorption properties

References

[1] Cui B D, Guan Y, Bi W L, et al. The Influence of Different Mineral Admixtures on the Heat Resistance of Magnesium Oxysulfide Cement[J]. Portland Bulletin, 2020, 39(02): 428-434. (in Chinese)

[2] Li B, Ji Z, Xie S, et al. Microwave Absorbing Properties of Cement-based Composite with Wedge-shaped Surface in Different Polarization Directions[J]. Journal of the Australian Ceramic Society, 2020: 1–10

[3] Li B, Ji Z, Xie S, et al. Electromagnetic Wave Absorption Properties of Carbon Black/cement-based Composites Filled with Porous Glass Pellets[J]. Journal of Materials Science: Materials in Electronics, 2019, 30(13): 12 416-12 425.

[4] Liu R Q, Liu J, Li Z. Research on Physical Properties of Foam Cement Based Microwave Absorbing Materials[J]. Concrete, 2017 (06): 85–87, 92(in Chinese)

[5] Shi N N, Gao P W, Li X Y. Research on the Application of Absorbing Materials in Modern Buildings[J]. Shandong Building Materials, 2007, (4):4–6(in Chinese)

[6] Zuo Y, Ye Y H. Research Progress of Cement-based Electromagnetic Shielding and Absorbing Materials[J]. Bulletin of the Chinese Ceramic Society, 2007, 26(2): 311-315. (in Chinese)

[7] Dou D R, Zhang X. Engineering Application of Cement-based Electromagnetic Eco-environmental Materials[J]. Journal of Building Materials, 2007, 10(5): 557-560. (in Chinese)

[8] Eubank W R. Calcination Studies of Magnesium Oxides[J]. Journal of Americal Ceramic Society, 1951, 34: 225-229.

[9] Wen J, Yu H F, Wu C Y, et al. Influencing Factors and Hydration Kinetics of Magnesium Oxychloride Cement Hydration Process[J]. Journal of the Chinese Ceramic Society, 2013, 41(05): 588-596. (in Chinese)

[10] Cwirzen A, Habermehl-Cwirzen K, Penttala V. Surface Decoration of Carbon Nanotubes and Mechanical Properties of Cement/carbon Nanotube Composites[J]. Advances in Cement Research, 2008, 20(2): 65-73.

[11] Wu C Y, Chen W H, Zhang H F, et al. The Hydration Mechanism and Performance of Modified Magnesium Oxysulfate Cement by Tartaric Acid[J]. Construction Building Materials, 2017, 144: 516-524.

[12] Kuenzel C, Zhang F, Ferrándiz-Ma V, et al. The Mechanism of Hydration of Mg O-hydromagnesite Blends[J]. Cement Concrete Research, 2018, 103: 123-129.

[13] Urwongse L, Sorrell C A. Phase Relationships in Magnesium Oxysulfate Cements[J]. Journal of the American Ceramic Society, 1980, 63(3): 523-526.

[14] Wu C Y, Chen W H, Zhang H F, et al. The Hydration Mechanism and Performance of Modified Magnesium Oxysulfate Cement by Tartaric Acid[J]. Construction and Building Materials, 2017, 144: 516-524.

[15] Tan Y S, Yu H F, Bi W L, et al. Hydration Behavior of Magnesium Oxysulfate Cement with Fly Ash via Electrochemical Impedance Spectroscopy[J]. Journal of Materials in Civil Engineering, 2019, 31(10): 04 019 237

[16] Xu X, Xu Y Y, Duan D L. Effect of Fineness and Components of CFBC Ash on Performance of Basic Magnesium Sulfate Cement[J]. Construction and Building Materials, 2018, 170: 801-811.

[17] Guo T, Wang H F, Yang H J, et al. The Mechanical Properties of Magnesium Oxysulfate Cement Enhanced with 517 Phase Magnesium Oxysulfate Whiskers[J]. Construction and Building Materials, 2017, 150: 844-850.

[18] Wu C Y, Yu H F, Zhang H F, et al. Effects of Phosphoric Acid and Phosphates on Magnesium Oxysulfate Cement[J]. Materials and Structures, 2015, 48(4): 907-917.

[19] RunčevsKi T, Wu C Y, Yu H F, et al. Structural Characterization of a New Magnesium Oxysulfate Hydrate Cement Phase and Its Surface Reactions with at Magnesium Thiooxide Cement Pheric Carbon Dioxide[J]. Journal of the American Ceramic Society, 2013, 96(11): 3 609-3 616.

[20] Zhang F Z. Characteristics and Application of Foamed Concrete[J]. Construction and Engineering, 2008 (23): 146

[21] Dong J M, Yu H F, Zhang L M. Test Conditions for the Legal Determination of Active MgO Content by Water[J]. Salt Lake Study, 2010, 18(01): 38-41.

[22] She W, Chen Y Q, Zhang Y S, et al. Characterizationand Simulation of Microstructure and Thermal Properties of foamed Concrete[J]. Construction and Building Materials, 2013(47): 1 278–1 291

[23] Liu H W, Peng H L, Gao P W, et al. Performance Research and Microscopic Analysis of Cement-based Wave-absorbing Material[J]. Function Material, 2015, 46(12): 12 150-12 152.

[24] Li B Y, Duan Y P, Liu S H. Wave Characteristics of Porous Aggregate Mortar[J]. Journal of Silicate, 2011, 39(10): 1 682-1 686.

[25] Sw P, Daik R, Abdullah M H. Poly(4,4’-diphenylene diphenylvinylene) as a Non-magnetic Microwave Absorbing Conjugated Polymer[J]. Thin Solid Films, 2005, 477(1–2): 125-130.

[26] Yusoff A N, Abdullah M H, Ahmad S H, et al. Electromagnetic and Absorption Properties of Some Microwave Absorbers[J]. Journal of Applied Physics., 2002, 92(2): 876-882.

[27] Cui B D, Guan Y, Bi W L. Non-isothermal Kinetic Analysis on the Thermal Decomposition of the Phase 517 from Hydration Product of Magnesium Sulfide Cement[J]. Journal of Wuhan University of Technology -Materials Science Edition, 2023, 38(02): 374-380.