Effect of Y2O3 Addition on Sintering Behavior of MA-CA2-CA6 Composite
YIN Xueliang1,2, CHEN Min1, WANG Nan1, XU Lei1, PENG Kewu1,2
1 School of Metallurgy, Northeastern University, Shenyang 110819; 2 Liaoning Key Laboratory of Optimization andUtilization of Non-associated Low-grade Iron Ore in Benxi, Liaoning Institute of Science and Technology,Benxi 117000
Abstract: In order to adapt the demands for the lightweight of materials, MA-CA2-CA6 composite was prepared at 1 400—1 600 ℃ by addition of Y2O3 micro powder, and the effect of Y2O3 addition on densification behavior of the composite was discussed. The results showed that the added Y2O3 dissolved to CA6, MA phases by substituting Ca2+, Mg2+, which mainly promoted the growth of MA grains in advance, while the abnormal growth of CA6 grains with high aspect ratio were inhibited. Furthermore, the excess Y2O3 reacted with Al2O3 to form the Y3Al5O12 phase, which further inhibited the formation and abnormal growth of CA6 grains with high aspect ratio, and the growth of MA grains in advance occupied the growing space of CA6 grains, thus the microstructure of CA6 grains was a more equiaxed morphology, instead of anisotropic growth to platelet structure. Based on those factors, the sintering activity of MA-CA2-CA6 composite was synergistically promoted. As a result, MA-CA2-CA6 composite was obtained, with the apparent porosity decreased from 19.2% to 4.8% and the bulk density increased from 2.78 g/cm3 to 3.24 g/cm3 after firing at 1 600 ℃ for 2 h by addition of 2% Y2O3, and the crystal phase of MA, CA2, CA6 and a spot of Y3Al5O12 phases was interleaved distributed with textured microstructure in MA-CA2-CA6 composite, which is considered to be favorable to improve the mechanical properties of MA-CA2-CA6 composite.
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2018, Vol. 32 
