基于降噪设计的陶粒微观结构调控的试验

Experimental Study on Microstructure Control of Porous Ceramsite Based on Noise Reduction Design

采用发泡法,在陶粒制作工艺中添加碳酸氢铵发泡剂,增加热处理程序。通过宏观试验和微观表征,控制发泡剂用量、升温速率、养护时间来调节陶粒的孔径、显孔率以及孔的有序性等微观结构,实现陶粒孔结构的可控,从而优化陶粒的吸声性能。研究表明:发泡剂的添加量越多、升温速率越高、增加热处理程序之前养护时间越短,所制备的陶粒显孔率越大、孔径越细小、孔排列的结构越有序均匀。当发泡剂的添加量为2.0 wt%、升温速率为20℃/min、热处理之前零养护时,可制备出最高显孔隙率为32.67%,平均孔径为0.31μm,孔结构有序均匀排列的多孔陶粒,并有效改善多孔材料在低频范围吸声性能;整个控制机理下所制备的多孔陶粒筒压强度都大于2.0 MPa,满足规范和使用要求。

The foaming method was used to prepare porous ceramsites as sound absorption material by add ammonium hydrogencarbonate as foaming agent and heat treatment procedure.Through macroscopic experiments and microscopic characterization,the amount of foaming agent,heating rate and curing time were controlled to adjust the pore size,pore-forming rate and pore order of the ceramsite.The achieved controllability of the pore structure of the ceramsite thereby optimized the sound absorption properties of the ceramsite.The research shows that the more the foaming agent is added,the higher the heating rate,or the shorter the curing time before the heat treatment process,the higher the porosity of the prepared ceramsite,the smaller the pore size,and the more orderly and more uniform the pore arrangement.When the addition amount of the foaming agent is 2.0 wt%,the heating rate is 20℃/min,and the curing is 0 before the heat treatment,the porous having the highest apparent porosity of 32.67%,an average pore diameter of 0.31μm,porous ceramsite with well-ordered pore structure and effective improvement of sound absorption performance of porous material in low frequency range.The porous ceramsite cylinder strength prepared under the whole control mechanism is greater than 2.0 MPa,meeting specifications and usage requirements.