盐球渗透铸造法制备开孔泡沫铝的孔结构及压缩性能  

Pore Structure and Compressive Properties of Open-Cell Aluminum Foams Prepared by Infiltration Casting Based on NaCl Space-Holder

作　　者：王召明 刘源[2,3] 徐法庭 万坦 金云学[1] Wang Zhaoming;Liu Yuan;Xu Fating;Wan Tan;Jin Yunxue(School of Materials Science and Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China;School of Materials Science and Engineering,Tsinghua University,Beijing 100084,China;Key Laboratory for Advanced Materials Processing Technology,Ministry of Education,Tsinghua University,Beijing 100084,China)

机构地区：[1]江苏科技大学材料科学与工程学院,江苏镇江212100 [2]清华大学材料学院,北京100084 [3]清华大学先进成形制造教育部重点实验室,北京100084

出　　处：《稀有金属材料与工程》2023年第1期119-124,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51771101)。

摘　　要：使用圆盘造粒机制备近球形的NaCl颗粒,并将其用于渗透铸造制备开孔泡沫铝。盐球的平均抗压缩强度为3.9 MPa,在超声波清洗机中可在5 min内完全塌陷。通过控制热压烧结时间为0.5~2 h,热压温度700℃,可制备堆积密度在0.66~0.83 g/cm^(3)的预制体。延长热压烧结时间会使开孔泡沫铝的孔径从0.48 mm增加到1.16 mm,孔隙率从64%增加到82%。压缩实验结果表明,不同孔隙结构下泡沫体的宏观变形特征基本相同,均表现出逐层塌陷的变形特征。此外,泡沫铝的致密化应变值、弹性模量、平台屈服应力和能量吸收能力均随着孔隙率的增加而降低。当孔隙率为64%时,能量吸收能力最大(15.0 MJ·m^(-3))。Nearly spherical NaCl particles prepared by a disc granulator were used to produce open-cell aluminum foams via infiltration casting.The average compressive strength of the salt balls is 3.9 MPa,and they can be completely collapsed within 5 min in the ultrasonic cleaner.By controlling the hot-pressure sintering duration as 0.5‒2 h and the hot-pressing temperature at 700°C,the preforms with bulk density of 0.66‒0.83 g/cm3 can be prepared.Prolonging the duration of hot-pressure sintering can increase the pore size of the open-cell aluminum foams from 0.48 mm to 1.16 mm,and also increase the porosity from 64%to 82%.Compression test results show that the macroscopic deformation characteristics of the foams with different pore structures are basically the same,and they all exhibit the deformation characteristic of layer-by-layer collapse.In addition,the densification strain value,elastic modulus,plateau yield stress,and energy absorption capacity of open-cell aluminum foams are al decreased with increasing the porosity.The energy absorption capacity is the largest(15.0 MJ·m^(-3))when the porosity is 64%.

关 键 词：NaCl球 开孔泡沫铝 热压烧结 压缩性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]