Author:
Andreev P V,Rostokina E Ye,Alekseeva L S,Murashov A A,Boldin M S,Balabanov S S
Abstract
Abstract
Spark plasma sintering (SPS) of mixtures based on silicon nitride nanopowders (Si3N4) was considered. A method for creating a mixture based on nanosized Si3N4 and a sintering additive of yttrium-aluminum garnet (YAG, Al5Y3O12) was developed. The precursor of the sintering additive was formed by the method of spray drying using a mixture of colloidal solutions of Al5(NO3)3(OH)12 and Y(OH)2(CH3COO). The produced mixture samples were studied by X-ray diffraction analysis and SEM. The kinetics of the SPS of the prepared mixtures was studied. The effect of preliminary annealing (up to 1000 °C) of the mixture on the formation of the YAG sintering additive have been considered, as well as the method of reactive synthesis of the sintering additive in the SPS process. It was found out that sintering of the annealed mixture does not allow forming high density ceramics. As a result of reactive sintering, ceramics based on Si2N2O were formed.
Cited by
2 articles.
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