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Microwave sintering of $MoSi_2-SiC$ composite

Panneerselvam, M and Agrawal, Ankur and Rao, KJ (2003) Microwave sintering of $MoSi_2-SiC$ composite. In: Materials Science and Engineering A, 356 (1-2). pp. 267-273.

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Microwave preparation of $MoSi_2-SiC$ composites has been studied using several strategies. Direct sintering of $MoSi_2$ and SiC mixtures using 2.45 GHz microwaves has been found to be the most successful approach. Sintered composites exhibit higher than 96.4% of theoretical density. Sintering times required are very short and of the order of only 10 min. The observed accelerated sintering has been discussed in the context of unique microwave effects. Vickers hardnesses and fracture toughnesses of the composites are in the range of 9.25/13.2 GPa and 3.2/4.5 MPa $m^{1/2}$ , respectively. Microwave sintered composites do not exhibit any pesting tendency at 550 8C even after 72 h of exposure to air. Reactive sintering of elemental powders and partially reactive sintering based on the use of one of the compounds $(MoSi_2\hspace{2mm}or\hspace{2mm} SiC)$ in the premix, do not result in good sintering and lead to the formation of unintended products such as $Mo_5Si_3$, $Si_3N_4$ and $Si_2ON_2$.

Item Type: Journal Article
Publication: Materials Science and Engineering A
Publisher: Elsevier
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: MoSi2-SiC composite;Microwave sintering;Microwave processing;Pest;Mechanical properties
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 02 Jun 2006
Last Modified: 19 Sep 2010 04:28
URI: http://eprints.iisc.ac.in/id/eprint/7296

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