Pore structure and performance of magnesium phosphate cement-based porous sound absorption material
ZHENG Junfeng
XIONG Yan
YIN Xiaoming
Abstract：Taking potassium dihydrogen phosphate,re-fired MgO,borax and self-manufactured pore agent as raw materials,adopting physical foaming process to prepare magnesium phosphate cement-based porous acoustic material,combining with body-view microscope,scanning electron microscope and other means to study its microstructure,acoustic noise reduction,mechanical properties.The results show that the dry density of the cement-based acoustic material prepared with magnesium phosphate cement decreases,the pore size of the pores becomes larger,the pore distribution becomes wider,the degree of connectivity increases,the connectivity between the pores becomes larger,the acoustic noise reduction ability is strengthened,and the mechanical properties decrease.Compared with the dry density of 943 kg/m3,when the dry density is reduced to 502 kg/m3,the percentage of connected pores of cement-based acoustic material increases from 38.7％to 98.1％,and the diameter of D50 pores increases from 0.366 mm to 0.501 mm,and the noise reduction coefficient measured by the impedance tube rises from 0.40 to 0.55,and the compressive strength decreases to from 5.4 MPa to 2.7 MPa.
Keywords：magnesium phosphate cement-based porous materialssound absorption propertypore structuremechanical strength
Publication Date：2025-04-25
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 61-64,69 )