Spray-drying of alumina powder for APS: effect of slurry properties and drying conditions upon particle size and morphology of feedstock

Bulletin of materials science

Bai Yu¹  Lee Soo Wohn²  Chen Huang²  Yu Fang Li¹  Zhang Jia²  Yang Jian Feng¹ 

[1] State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P.R. China$$State Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P.R. ChinaState Key Laboratory for Mechanical Behavior of Materials, Xi’an Jiaotong University, Xi’an 710049, P.R. China$$;Department of Materials Engineering. Sun Moon University, Korea$$Department of Materials Engineering. Sun Moon University, KoreaDepartment of Materials Engineering. Sun Moon University, Korea$$

关键词: Spray drying;    feedstock;    particle size;    morphology.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

In this paper, effects of variables concerning slurry properties and drying conditions on the particle size and morphology of feedstock were discussed. The results indicated that, the increase of powder loading increased 𝐷₅₀ and volume content but reduced recovery rate slightly. Other variables, such as inlet temperature, showed a maximum on the desired property. The particle size of resulting feedstock increased with the rise of feeding rate of slurry, however, decreased with the increase of atomization pressure based on the premise that atomization pressure was enough to force slurry to form the liquid membrane. For preparation of spherical feedstock, optimized variables were as follows: 60 wt.% powder in slurry, 2 wt.% PVA in slurry, inlet temperature of 60°C, atomization pressure of 13 Ã�? 10³ KPa and feeding rate of 12 ml min^-1. The volume content of feedstocks with 10â€�??45 𝜇m was above 65% and for 𝐷₅₀ it was 15.42 𝜇m. In addition, according to the heat and mass transfer equation, the drying mechanism was established, which was well in agreement with the experimental results.

【 授权许可】

Unknown