摘要
不锈钢纤维烧结毡用于过滤领域时,过滤介质中通常含有强腐蚀性的Cl-,使得纤维骨架发生腐蚀而断裂,从而降低其过滤性能。为此,本文以HCl溶液为腐蚀介质,探讨了腐蚀介质浓度、纤维直径、孔隙率对不锈钢纤维烧结毡经HCl溶液腐蚀后的拉伸性能的影响规律。结果表明,HCl溶液浓度为1%时,烧结毡腐蚀前后的抗拉强度基本没有变化,HCl溶液浓度增大到10%时,烧结毡的抗拉强度仅下降了1.8 MPa;经10%HCl溶液腐蚀后,当纤维直径为8μm时,烧结毡的抗拉强度降幅为2.59 MPa,而纤维直径为28μm时,烧结毡的抗拉强度降幅仅为0.19 MPa;经10%HCl溶液腐蚀后,烧结毡的孔隙率为75%时,其抗拉强度降幅为4.22 MPa,而烧结毡的孔隙率增大到95%时,其抗拉强度降幅仅为0.88 MPa。因此,对于含Cl-浓度不超过10%的过滤环境,不锈钢纤维烧结毡仍是首选过滤材料;在满足过滤精度的前提下,宜选择粗直径纤维(20~28μm)、高孔隙率(80%~85%)的烧结毡制备过滤材料。
When sintered stainless steel fiber felts is used in the field of filtration,the filtrate medium usually contains highly corrosive Cl-,causes the fiber skeleton to be corroded and fractured,thus reducing its filtration performance.HCl solution was used as corrosion medium in this paper.The effects of the concentration of corrosion medium,fiber diameter and porosity on the tensile properties of sintered stainless steel fiber felts after corrosion in the HCl solution were obtained.The results shows when the concentration of HCl solution is 1%,the tensile strength of sintered felt does not change before and after corrosion;when the concentration of HCl solution increased to10%,the tensile strength of sintered felt only decreased 1.8 MPa;after corrosion with 10%HCl solution,the tensile strength of sintered felt decreases by 2.59 MPa when fiber diameter is 8μm,and the tensile strength of sintered felt is only decrease 0.19 MPa when fiber diameter is 28μm.After corrosion with 10%HCl solution,the decrease of tensile strength is 4.22 MPa when the porosity of sintered felt is 75%,and the decrease of tensile strength is only 0.88 MPa when the porosity increased to 95%.Thus,sintered stainless steel fiber felts is still the preferred filter material for the filtration environment with Cl-concentration less than 10%.On the premise of meeting the filtration accuracy,the sintered felts should be prepared by coarse fiber with the diameter of 20~28μm and the porosity of 80%~85%.
作者
王建忠
敖庆波
刘怀礼
马军
李爱君
WANG Jianzhong;AO Qingbo;LIU Huaili;MA Jun;LI Aijun(Northwest Institute for Non-ferrous Metal Research,State Key Laboratory of Porous Metal Materials,Xi'an 710016,China)
出处
《粉末冶金工业》
CAS
北大核心
2021年第6期54-59,共6页
Powder Metallurgy Industry
基金
陕西省重点研发计划资助项目(2020KW-037)
陕西省科技资源开放共享平台(2020PT-039)。
关键词
不锈钢纤维
烧结
孔隙率
腐蚀
拉伸性能
stainless steel fiber
sintering
porosity
corrosion
tensile performance
