Study On The Preparation Of Microcrystal Muscovite For Porous Absorption Materials

In this paper, porous absorption materials are prepared by direct calcination on the high temperature, which have high porosity and good sound absorption properties. The structure and properties of porous sound-absorbing materials are characterized by Scanning electron microscope(SEM), universal testing machine and the absorption coefficient tester. The effect of microcrystal muscovite powder particle size, sintering temperature and additives on the pore structure of the porous sound-absorbing material, compressive strength, porosity and efficiency of sound-absorbing was analyzed. The results show that:(1)The powder particle size and sintering temperature of microcrystal muscovite have a great influence on the structure and properties of porous materials. With the increase of the sintering temperature, the porosity of microcrystal muscovite porous material increase first and then reduce, the compressive strength shows the opposite trend. The optimum particle size of microcrystal muscovite to prepare porous sound-absorbing materials is 600, and the best sintering temperature is 1250 ?. In this condition, the prepared porous absorption materials have the best sound absorption property, and the biggest coefficient of sound absorption is 0.50.(2)Add a pore- forming agent to experimental materials can improve the pore structure and properties of porous sound-absorbing material. The type and dosage of pore-forming agent have a significant influence on the pore structure, compressive strength, porosity and efficiency of sound-absorbing of porous materials. In the 1210?~1260?, with the increase of the sintering temperature and the dosage of pore-forming agent, the porosity of porous materials added urea or starch has increased, and the compressive strength has reduced. The porous material added urea has a bigger porosity. The optimum dosage of urea pore- forming agent to prepare porous sound-absorbing materials is 25%,and the prepared porous absorption materials have a good sound absorption property in 1250 ?,the biggest coefficient of sound absorption is 0.62. The porous absorption material added starch as the pore-forming agent has a poor sound absorption property and the coefficient of sound absorption is small.(3) Porous sound-absorbing materials used sodium dodecyl sulfate and calcium sulfate as the blowing agents are prepared by foaming. With the increase of the sintering temperature, the aperture and porosity of porous material increase first and then reduce, the compressive strength reduce first and then increase. When the dosage of blowing agent increases, the aperture and porosity of porous materials have increased, and the compressive strength has reduced. The optimum sintering temperature to prepare porous sound-absorbing material is 1250 ?, and the optimum dosage of blowing agent is 5%. When the sintering temperature is 1250 ?, the sample has a uniform pore distribution and the number of pore is large. The porosity of porous materials added 5% sodium dodecyl sulfate or calcium sulfate is more than 80%, and the biggest porosity is 86.36% and84.42%. In optimal conditions, the absorption coefficient of porous sound-absorbing materials has a large change in the low frequency region(100Hz-1600Hz). In the high frequency region(1600Hz-6300Hz), the samples added blowing agent have a good sound absorption property. The biggest sound absorption coefficient of the sample added sodium dodecyl sulfate is 0.56, the sample added CaSO4 is 0.85.