Mechanical properties and oxidation behavior of silicon carbide-molybdenum silicides composites

作者：Magnani Giuseppe^*; Brentari Alida; Burresi Emiliano; Coglitore Antonino

来源：Ceramics International, 2013, 39(3): 3345-3351.

DOI：10.1016/j.ceramint.2012.10.024

• Composites
• Silicides
• SiC
• Oxidation

SiC-MoSi2 porous preforms with different SiC/MoSi2 weight ratios were densified by means of the melt infiltration method. Mixture of SiC-MoSi2-Mo (<=) (5)Si3(C) (<=) (1) was used as infiltrant. The resultant infiltrated composites showed high density, good mechanical properties and oxidation resistance. In particular, fracture toughness determined at 1773 K was 6.80 MPa m(1/2) and 6.28 MPa m(1/2) with SMI-80 (preform with SiC/MoSi2 weight ratio 80/20) and SMI-50 (preform with SiC/MoSi2 weight ratio 50/50) composites, respectively. The same composites showed high temperature (1773 K) flexural strength values: 214 MPa (SMI-80) and 242 MPa (SMI-50). Long term oxidation behavior was also tested at 1773 K and results confirmed the refractoriness of these materials.

• 出版日期2013-4