Microstructural development of interface layers between co-sintered alumina and spinel compacts

作者：Yalamac Emre; Carry Claude; Akkurt Sedat^*

来源：Journal of the European Ceramic Society, 2011, 31(9): 1649-1659.

DOI：10.1016/j.jeurceramsoc.2011.03.020

• Al(2)O(3)
• Spinels
• Interfaces
• Sintering
• Microstructure-final

Tests were performed to investigate the microstructure of the interface between alumina and spinel materials after high temperature thermal treatment (1500 degrees C). The first test involved co-sintering of co-pressed alumina and spinel compacts. Microstructures were investigated by SEM, EDS, WDS and EBSD. A microstructurally distinct layer with columnar grains of up to 40 mu m length and 5 mu m width was observed after 16 h at 1500 degrees C. Growth rate of the columnar spinel grains from parent spinet towards alumina follows parabolic kinetics, controlled by a mixed process of O(2-) ion diffusion and interface reaction. Diffusion couples of spinel and alumina were investigated. Same columnar spinel grains were observed at the interface which grew into alumina during thermal treatment with the same kinetics as in co-sintering experiments. The shape of the phase boundaries between spinel and alumina can be a further indication of the direction of their growth.

• 出版日期2011-8