Y2O3添加对MA-CA2-CA6复合材料烧结行为的影响

doi:10.11896/j.issn.1005-023X.2018.08.028

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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.

Key words： lightweight composite sintering microstructure mechanical properties

Published: 11 May 2018

CLC number:

TB33

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	Articles by authors
	YIN Xueliang
	CHEN Min
	WANG Nan
	XU Lei
	PENG Kewu

Cite this article:

YIN Xueliang,CHEN Min,WANG Nan, et al. Effect of Y₂O₃ Addition on Sintering Behavior of MA-CA₂-CA₆ Composite[J]. Materials Reports, 2018, 32(8): 1357-1361.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2018.08.028 OR http://www.mater-rep.com/EN/Y2018/V32/I8/1357

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