Please use this identifier to cite or link to this item:
|Title:||Yttria nanopowders with low degree of aggregation by a spray precipitation method||Authors:||Yin, Danlei
Kong, Ling Bing
|Keywords:||Engineering::Materials||Issue Date:||2018||Source:||Yin, D., Wang, J., Liu, P., Luo, D., Kong, L. K., Dong, Z., & Tang, D. (2018). Yttria nanopowders with low degree of aggregation by a spray precipitation method. Ceramics International, 44(16), 20472-20477. doi:10.1016/j.ceramint.2018.08.042||Journal:||Ceramics International||Abstract:||Highly sinterable Y2O3 nano-powder with low degree of agglomeration was synthesized by using a spray precipitation technology, without the use of any additives and dispersants. Compared with the precursor made by using the dripping method (D-precursor), the precursor made by the spraying method (S-precursor) had much lower degree of hard agglomeration. So did the resultant calcined Y2O3 powder (S-Y2O3 powder) as compared with the D-Y2O3 powder. Sintering behaviors of the two powders were studied. Ceramics made from the S-Y2O3 powder (S-Y2O3 ceramics) showed much higher densification rate and final density. After vacuum sintered at 1650 °C for 5 h, relative density of the D-Y2O3 ceramics was merely 97.3%, while that of the S-Y2O3 ceramics reached 99.5%. In addition, the D-Y2O3 ceramics cannot be sintered to 98% relative density by using the vacuum sintering technique, due to the high degree of agglomeration of the D-Y2O3 powder. Moreover, the S-Y2O3 ceramic exhibited homogeneous microstructure and an in-line optical transmittance of 81.6% at 1200 nm after HIP treatment. The spray precipitation method should be applicable to synthesizing other oxide powders.||URI:||https://hdl.handle.net/10356/142514||ISSN:||0272-8842||DOI:||10.1016/j.ceramint.2018.08.042||Rights:||© 2018 Elsevier Ltd and Techna Group S.r.l. All rights reserved.||Fulltext Permission:||none||Fulltext Availability:||No Fulltext|
|Appears in Collections:||MSE Journal Articles|
Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.