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1 Archives of Foundry Engineering

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Combustion synthesis of Al-Ni compounds in microwave reactor

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Naplocha K. , Granat K.

tom Vol. 8, iss. 4

153-156

Investigations of intermetallic compounds of Al-Ni system produced on the base of combustion synthesis method are presented. It was aimed to obtain homogeneous chemical constitution and porous structure used to locally reinforce castings. Production method of perform with microwave heating was elaborated. Special heating chamber with strongly focused field and possibility of exact control process was constructed. Various stoichiometric ratio samples corresponding to compounds from binary diagram were synthetized. Basing on the temperature profiles dynamics of process was analyzed, typical combustion temperatures and possible compounds were determined. Microscopic investigations with chemical analysis EDS showed considerable differences in chemical constitution and morphology of phases. Sample made from mixture of powders with composition of Al:Ni = 3:1 revealed relatively uniform porosities but considerable differences in chemical composition. With increase of Ni content the synthesis underwent at higher temperatures, with progress of reaction the melting of transient phases led to uniform chemical composition of product. Unfortunately as a result of structure fusion coagulation and closing of pores occurred excluding received structure for further attempts to infiltrate with squeeze casting method.