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Functionally graded multi-material freeze-cast structures with continuous microchannels
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DOI：10.1016/j.jeurceramsoc.2019.12.018.png)
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摘要
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We present the processing of functionally graded multi-material freeze-cast structures, i.e. structures with varying material properties but continuous and homogeneous microchannels. We demonstrate this for stepwise, continuous, highly viscous and gelation freezing to achieve freeze-cast structures of graded La0.66Ca0.24Sr0.09Mn1.05O3 (LCSM9) and La0.67Ca0.27Sr0.06Mn1.05O3 (LCSM6) ceramics. The two phases are successfully distinguished from one another by the addition of 10 wt% Ce0.9Gd0.1O2 (CGO) to the LCSM6 phase. The relative Ce-content facilitates tracking of the LCSM6 phase using energy-dispersive X-ray (EDS) elemental analysis. Coupled with scanning electron microscopy, we show well-defined interfaces with continuous microchannels between the two LCSM phases in both green and sintered samples. By implementing constant freezing rates of -1.5 K/min a consistent freezing front velocity of similar to 13 mu m/s is maintained, and we found that a structural continuity can be maintained across the LCSM9-LCSM6/CGO interface, however, with varying pore morphology depending on the various freezing procedures.
Keyword:
Freeze-casting
Functionally graded materials
Layered structure
Porous ceramics
Magnetocaloric
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6.2
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1.7W
被引数:
5.1W
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