Effect of process parameter on the flowability of nanocrystalline CoNiCrAlY powder synthesized by mechanical milling  

作　　者：Annadaa Shankara Dash Indranil Manna Deepa Devapal Sharad Chandra Sharma Jyotsna Dutta Majumdar 

机构地区：[1]School of Nanoscience and Technology,IIT Kharagpur,West Bengal,India [2]BIT Mesra,Ranchi,Jharkhand,India [3]Department of Metallurgical and Materials Engineering,IIT Kharagpur,West Bengal,India [4]Vikram Sarabhai Space Centre,Thiruvanthapuram,Kerala,India

出　　处：《Particuology》2024年第9期210-223,共14页颗粒学报（英文版）

基　　金：the Indian Space Research Organization(ISRO),India,Science and Engineering Research Board,N.Delhi(POWER Fellowship,SPF/2021/000073,Dt.11-03-2021),Ministry of Human Resource Development(MHRD);Government of India(under IMPRINT-2,sanction letter IMP/2018/001162,Dt.02-01-2019);Department of Science and Technology(DST),N.Delhi(DST/TSG/AMT/2015/636/G,Dt.18-06-2018,DST/TDT/AMT/2017/074(G),Dt.12-09-2018);Alexander von Humboldt Foundation。

摘　　要：The present study concerns understanding the effect of process parameters on the characteristics and flowability of nanocrystalline CoNiCrAlY powder synthesized by mechanical milling.Mechanical milling has been conducted in a planetary ball mill with tungsten carbide(WC)ball,with ball to powder ratio of 10:1 at 300 rpm speed,using 1%stearic acid and toluene as process control agent(PCA)with time varying from 10 h to 36 h.The synthesized nanocrystalline powder were characterized by Scanning Electron Microscopy,X-ray Diffraction technique,X-ray Photoelectron Spectroscopy,and Differential Scanning Calorimetry.Subsequently,flowability in terms of Hausner ratio was assessed by Tap Density Tester.Average particle size of the powder was found to decrease from 33μm to 22μm after 10 h of milling and further increases to 43μm and 38μm after 25 and 36 h of milling,respectively,in stearic acid medium.However,in toluene medium particle size continuously decreases from 33μm to 9.7μm with increasing milling time.The particle morphology changes from spherical to platelet shape at low milling hours in both of the media.After 25 h of milling,the shape of the particles is nearly spherical for stearic acid and irregular for toluene used as a PCA.Crystallize size was found to decrease with increasing milling time from 147 nm to 7.7 nm and to 6.4 nm in stearic acid and toluene media,respectively.There was presence ofγ,γʹ,β,hcp-Co,Al_(2)O_(3)and AlOOH phases on the powder particles milled in both the medium.The measured Hausner ratio of the powders was found to vary from 1.18 to 1.32 in stearic acid medium,and was found to increase with increasing milling time.On the other hand,in toluene media flowability decreases(Hausner ratio increases from 1.33 to 1.44)with increasing milling time.

关 键 词：Mechanical milling Microstructure Process control agent(PCA) CONICRALY TOLUENE Stearic acid FLOWABILITY 

分 类 号：TB383[一般工业技术—材料科学与工程] O35[理学—流体力学]