The development of silicon carbide (SiC) based composites using MoSi 2 as the secondary electroconductive phase for the matrix was investigated. A mixture of SiC and 10 vol % MoSi2 was hot pressed at 1900°C, without any addition of sintering aids. An improvement of the final; relative density from 60 to 86% was obtained with the addition of 2 wt% of Y2O3. In the reinforced composite containing 30 vol% of MoSi2, the fracture toughness increased of about 27 % in comparison with the reference SiC material. It was observed that the addition of MoSi 2 particles to the Sic matrix caused a gradual decrease of the electrical resistivity of the composites. The hardness of the composites decreased with increasing the MoSi2 content, while the Young's Modulus existed near the SiC reference value.

High strength and toughness electroconductive SiC-based composites

BALBO, Andrea;
2006

Abstract

The development of silicon carbide (SiC) based composites using MoSi 2 as the secondary electroconductive phase for the matrix was investigated. A mixture of SiC and 10 vol % MoSi2 was hot pressed at 1900°C, without any addition of sintering aids. An improvement of the final; relative density from 60 to 86% was obtained with the addition of 2 wt% of Y2O3. In the reinforced composite containing 30 vol% of MoSi2, the fracture toughness increased of about 27 % in comparison with the reference SiC material. It was observed that the addition of MoSi 2 particles to the Sic matrix caused a gradual decrease of the electrical resistivity of the composites. The hardness of the composites decreased with increasing the MoSi2 content, while the Young's Modulus existed near the SiC reference value.
2006
D., Sciti; L., Silvestroni; Balbo, Andrea; S., Guicciardi; G., Pezzotti
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/532686
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