摘要
为了提高碳化硅基多孔陶瓷的过滤性能,以碳化硅粉体、氧化铝粉体、聚醚多元醇、多亚甲基多苯基异氰酸酯、二月桂酸二丁基锡、三乙烯二胺、稳泡剂硅油(阿拉丁)为原料,通过聚氨酯发泡技术,研制了三维(3D)网状孔壁结构的碳化硅基多孔陶瓷试样,并探索了料浆固含量(固相质量分数分别为45%、50%、55%和60%)对试样显微结构、物理性能和颗粒物过滤性能的影响。结果表明:1)随着固含量的升高,试样体积密度和常温耐压强度提高,显气孔率降低;2)聚氨酯发泡过程中产生的微孔会分布在陶瓷孔壁上形成网状孔壁结构,增大颗粒物与孔壁碰撞概率,提高试样的过滤效率;同时,网状孔壁结构还可以提高试样气孔贯通性,降低其压降;3)当固含量为55%(w)时,试样体积密度约为0.57 g·cm^(-3),显气孔率为79.2%,常温耐压强度为3.7 MPa;且对颗粒物的去除率高达91.2%,具有良好的再生性能。
In order to improve the filtration performance,silicon carbide porous ceramics with network cell wall were fabricated via the polyurethane foaming method using silicon carbide powder,alumina powder,polyether polyol,polymethylene polyphenyl polyisocyanate,dibutyltin dilaurate,triethylenediamine and silicone oil(foam stabilizer)as raw materials.The effects of the solid loadings of the slurry(45%,50%,55%and 60%,by mass)on the microstructure,physical properties and their filtration properties towards particulate matters were studied.The result shows that:(1)with the increasing solid loading,the bulk density and cold compressive strength gradually increase,and the apparent porosity decreases;(2)the micropores generated during the polyurethane foaming process are distributed on the ceramic pore wall to form a network cell wall structure,which increases the collision probability between particles and the wall pores and improves the filtration efficiency;meanwhile,the network cell wall structure also improves the pore interconnectivity and reduces the press drop;(3)when the solid loading is 55%,the silicon carbide based porous ceramics have the bulk density of 0.57 g·cm^(-3),apparent porosity of 79.2%,cold compressive strength of 3.7 MPa,and the filtering efficiency of the particulate matter of 91.2%,achieving good regeneration performance.
作者
刘静静
岳卫东
熊飞
单言芳
Liu Jingjing;Yue Weidong;Xiong Fei;Shan Yanfang(Technical Support Center for Prevention and Control of Disastrous Accidents in Metal Smelting,University of Science and Technology Beijing,Beijing 100083,China;不详)
出处
《耐火材料》
CAS
北大核心
2024年第2期132-136,共5页
Refractories
基金
清华大学新型陶瓷与精细工艺国家重点实验室开放基金(KF202210)
省部共建耐火材料与冶金国家重点实验室开放基金(G202309)。
关键词
碳化硅
多孔陶瓷
聚氨酯发泡
网状孔壁
过滤效率
固含量
silicon carbide
porous ceramics
polyurethane foaming
network cell wall
filtering efficiency
solid loading
