Fig. 4 demonstrates XRD patterns of spark plasma and micro-
wave sintered samples. As this figure reveals in SPS sintered sample
only Al and B4C phases are observed while in microwave sintered
sample, the interfacial reaction causes the formation of Al3BC. It
seems that B4C acted as a good absorber for microwave irradiation
[27], and causes the increase of temperature at the interfacial of
aluminum and B4C particles more than that measured by pyrom-
eter for whole of the sample, and therefore, accelerates the for-
mation of Al3BC. Viala et al. [28] reported that when the heating
temperature is lower than 933 K (660 C) and while aluminumis in
the solid state, the interaction between aluminumand B4C particles
proceeds very slowly and causes the formation of Al3BC and AlB2
compounds. At temperatures higher than 933 K, aluminum is
melted which sharply increases the reaction rate. Up to 1141 K
(868 C), the reaction products are Al3BC and AlB2, while at tem-
peratures higher than 1141 K, Al3BC is still detectable and AlB2 is
removed while Al3B48C2 (b-AlB12) is formed.
Fig. 4 demonstrates XRD patterns of spark plasma and micro-wave sintered samples. As this figure reveals in SPS sintered sampleonly Al and B4C phases are observed while in microwave sinteredsample, the interfacial reaction causes the formation of Al3BC. Itseems that B4C acted as a good absorber for microwave irradiation[27], and causes the increase of temperature at the interfacial ofaluminum and B4C particles more than that measured by pyrom-eter for whole of the sample, and therefore, accelerates the for-mation of Al3BC. Viala et al. [28] reported that when the heatingtemperature is lower than 933 K (660 C) and while aluminumis inthe solid state, the interaction between aluminumand B4C particlesproceeds very slowly and causes the formation of Al3BC and AlB2compounds. At temperatures higher than 933 K, aluminum ismelted which sharply increases the reaction rate. Up to 1141 K(868 C), the reaction products are Al3BC and AlB2, while at tem-peratures higher than 1141 K, Al3BC is still detectable and AlB2 isremoved while Al3B48C2 (b-AlB12) is formed.
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