论文信息 - Combustion Synthesis of Silicon Nitride‐Silicon Carbide Composites

Combustion Synthesis of Silicon Nitride‐Silicon Carbide Composites

The feasibility of synthesizing silicon nitride-silicon carbide composites by self-propagating high-temperature reactions is demonstrated. Various mixtures of silicon, silicon nitride, and carbon powders were ignited under a nitrogen pressure of 30 atm (∼ 3 MPa), to produce a wide composition range of Si3N4-SiC powder products. Products containing up to 17 vol% of SiC, after being attrition milled, could be hot-pressed to full density under 1700°C, 3000 psi (∼ 21 MPa) with 4 wt% of Y2O3. The microhardness and fracture toughness of these composites were superior to those of the pure β-Si3N4 matrix material and compared very well with the properties of “traditionally” prepared composites.

V. Hlavácek | J. Puszynski | C. Agrafiotis | J. Lis

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