Sintering of B₄C-SiC Composites with ALN-Y₂O₃ Addition

Abstract:

One suitable material candidate to improve B₄C mechanical properties is SiC. B₄C-SiC ceramic composites are very promising armor materials because B₄C and SiC are intrinsically very hard. In this work a pressureless sintering study of B₄C-SiC ceramics was made. B₄C-SiC mixtures were prepared with SiC concentration from 10 to 50 wt%. Without the external applied pressure during sintering it was necessary to add sintering aid. The additive system AlN-Y₂O₃ was investigated as sintering aid. Samples were densified by pressureless sintering at 2000 °C/30 min in an argon atmosphere. B₄C-SiC composites were analyzed by XRD and SEM. Bulk density and total weight loss were also measured. Density higher than 93 % of the theoretical value was determined and microhardness of 30.3 GPa was achieved for composite with 10 wt% of SiC sintered with AlN-Y₂O₃ additive.

• Periodical: Materials Science Forum (Volumes 727-728)
• Pages: 850-855
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.727-728.850
• Online since: August 2012
• Authors: Rosa Maria da Rocha, Francisco Cristóvão Lourenço de Melo
• Keywords: Boron Carbide, Composite, Covalent Ceramics, Silicon Carbide (SiC), Sintering

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