Characterization of powder flow properties from micron to nanoscale using FT4 powder rheometer and PT-X powder tester  

作　　者：Hui Du Haifeng Lu Jie Tang Haifeng Liu 

机构地区：[1]Shanghai Engineering Research Center of Coal Gasification,East China University of Science and Technology,Shanghai,200237,China

出　　处：《Particuology》2023年第4期1-10,共10页颗粒学报（英文版）

基　　金：support from the National Natural Science Foundation of China(grant No.51876066);Shanghai Engineering Research Center of Coal Gasification(grant No.18DZ2283900).

摘　　要：The rapid development of nanotechnology has led to a need to further understand the physical char-acteristics of nanoparticles.In this paper,the flow characteristics of micro-nano alumina particles with different particle sizes were characterized.The FT4 powder rheometer and the PT-X powder tester were used to measure the compression,friction,and dynamic properties of powders.Powder compressibility increased significantly as the particle size decreased from 27 μm to 30 nm.Pressure distribution in the silo was measured and predicted by Janssen's theory,with errors mostly less than 10%.The basic flow energy and the specific energy of the three powders were 4983,1734,and 244 mJ,and 6.80,11.70,and 6.70 mJ/g,respectively,indicating that there was no linear relationship between the change in flowability and particle size.The dynamic properties of the powders change from particle-dominated to agglomeration-dominated as the particle size decreases.The conclusion is supported by the results of field emission scanning electron microscopy.

关 键 词：Micro-nano powders Flow properties COMPRESSIBILITY Frictional properties Pressure distribution 

分 类 号：TB383[一般工业技术—材料科学与工程]