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Microstructural evolution of supra‐nanostructure Al 2 O 3 /ZrO 2 eutectic powders by combustion synthesis‐spray cooling
Author(s) -
Yu Wanjun,
Zheng Yongting,
Yu Yongdong,
Su Xiaoyue
Publication year - 2019
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16646
Subject(s) - eutectic system , materials science , microstructure , nanostructure , chemical engineering , nanoparticle , particle (ecology) , metallurgy , phase (matter) , combustion , nanotechnology , chemistry , oceanography , organic chemistry , geology , engineering
Eutectic powders with fine microstructure are difficult to synthesize by crushing eutectic bulk because of the damage of crystal structure and the introduction of milling media during preparation process. In this work, a novel combustion synthesis‐spray cooling (CSSC) method is developed to fabricate supra‐nanostructure Al 2 O 3 /ZrO 2 eutectic powders. CSSC is a kind of self‐heating technique, which simplifies operations, reduces costs and supplies ultra‐high cooling rate. The phase composition and the microstructural evolution are investigated using experiment studies and ANSYS simulation. During the process, the t‐ZrO 2 are stabilized at room temperature because of the solubility of Al 2 O 3 in ZrO 2 . The ultra‐high cooling rate greatly refined eutectic structure. Although the eutectic structure coarsens with increases in particle size, the interphase spacing of all particles reaches supra nanoscale. The work provides a route for preparing supra‐nanostructure Al 2 O 3 /ZrO 2 eutectic powders and for better understanding the microstructural evolution.