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Title: Yttria nanopowders with low degree of aggregation by a spray precipitation method
Authors: Yin, Danlei
Wang, Jun
Liu, Peng
Luo, Dewei
Kong, Ling Bing
Dong, Zhili
Tang, Dingyuan
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.
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
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