Processing of in-situ SiC reinforced AlN based composites

다국어 초록 (Multilingual Abstract)

In this study, highly dense (>97%) in-situ SiC reinforced AlN based ceramic-metal composites were produced by pressurelessreactive infiltration of 7075 aluminium alloys into porous α-Si3N4, α-Si3N4 + 4 wt. % carbon and α-Si3N4 + 8 wt. % carbonpreforms at 1400 oC for 4 hours under an argon gas atmosphere. X-ray diffraction and transmission electron microscopyanalysis of the designed α-Si3N4-Al and α-Si3N4-C-Al composites revealed that Si3N4 was completely consumed during theinfiltration process via reacting with the Al alloy and resulted in the formation of AlN and Si phases. The aim of the currentwork was to introduce a novel method to produce in-situ SiC reinforced AlN based ceramic-metal composites. Composites withrelatively low metal contents were successfully fabricated through incorporating active carbon to the starting α-Si3N4 powder,which in turn consumes the liberated metallic Si phase in the system via chemical reactions leading to the formation of SiCceramic phase. Formation of in-situ SiC, AlN and metallic Si were also confirmed by analytical transmission electronmicroscopy investigations.

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