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Home  >  Journal list  >  Journal of the Ceramic Society of Japan  >  Vol.126  No.12 (December ) (2018)  >  pp.977-983

Journal of the Ceramic Society of Japan
<<Previous article Vol.126  No.12 (December ) (2018)   pp.977 - 983 Next article>>

The adjustment of CA6 morphology and its effect on the thermo-mechanical properties of high temperature composites

Feng WANG, Xiangcheng LI, Pingan CHEN, Girish Madhav KALE, Boquan ZHU
Feng WANG
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology
Xiangcheng LI
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology
School of Chemical and Process Engineering, University of Leeds
Pingan CHEN
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology
Girish Madhav KALE
School of Chemical and Process Engineering, University of Leeds
Boquan ZHU
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology

In this paper, the morphology of CA6 was adjusted by changing the particle sizes of alumina powders (D50 = 7.26, 5.33 and 2.37 µm), and the effect of this on the thermo-mechanical properties of corundum based high temperature composites was investigated. The results indicated that when the alumina particle size was decreased from 7.26 to 2.37 µm, the morphology of calcium hexaluminate (CA6) transformed from equiaxial to platy shape. The microstructure changes of CA6 may be due to differences in CA6 nuclei numbers and the contact area between alumina and calcium dialuminate. This transformation process can proceed without liquid. Because of the transformation of the CA6 morphology, the hot modulus of rupture and residual cold modulus of rupture of corundum composites fired at 1600°C increased by 143 and 192%, respectively. The loop areas of in-situ elastic modulus also increased by 20%. The fracture ways of composites were transformed from intergranular to transgranular. Therefore, corundum-based composites with excellent properties including room temperature and high temperature properties can be obtained by adjusting the microstructure of CA6.


Keyword:
High temperature composites, CA6, Morphology adjustment, Platy shape, Thermo-mechanical properties

Received: July 20, 2018
Accepted: September 12, 2018 , Published online: December 01, 2018

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