Yttria nanopowders with low degree of aggregation by a spray precipitation method

• Main Authors: Yin, Danlei, Wang, Jun, Liu, Peng, Luo, Dewei, Kong, Ling Bing, Dong, Zhili, Tang, Dingyuan
• Other Authors: School of Electrical and Electronic Engineering
• Format: Article
• Language: English
• Published: 2020
• Subjects: Engineering::Materials; Yttria Transparent Ceramics; Co-precipitation
• Online Access: https://hdl.handle.net/10356/142514
• Institution: Nanyang Technological University

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.