Research on Rheological Behavior of Si3N4-SiC Composites by Gelcasting

Xiao Ran Gong; Shuang Sheng Shen; Jin Wu

doi:10.4028/www.scientific.net/AMR.1004-1005.488

Paper Titles

Statistical Classification Method of Structure Model on Compound Friction Materials
p.468

Stress Singularities near Interface Crack Tip for Mode II of Orthotropic Bi-Material
p.473

Decontamination Performance of ZnFe₂O₄/Expanded Graphite Composites
p.479

Research on Feasibility and Structural Design of Fiber Reinforced Composite Sluice Gate
p.484

Research on Rheological Behavior of Si₃N₄-SiC Composites by Gelcasting
p.488

Research on the Dynamic Buckling Characteristics of Carbon Fiber Composite Honeycomb Panel under Out-of-Plane Impact Load
p.492

Study of Wood Plastic Composites on Mechanical and Thermal Properties after Immersed into Water
p.497

Friction and Wear Performance of Ti-Al Matrix Composites under 650°C
p.501

Micro Crack Transverse Propagation Simulation of Carbon Fiber Reinforced Composites
p.505

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Research on Rheological Behavior of Si₃N₄-SiC Composites by Gelcasting

Abstract:

Using SiC particles and powder, the modified Si and α-Si₃N₄powder as the main raw material, Si₃N₄-SiC composite materials have been fabricated by gelcasting. The Si₃N₄-SiC suspension with 75vol% (volume fraction) solid loading exhibits shear thinning rheological behavior under a shear rate from 10 to 160s^-¹, which meets the requirement of the gelcasting process. The bulk density of the green bodies after solidification is 2.57 g·cm^-3 and the flexural strength 16 MPa, the green bodies have a dense and uniform structure. The bulk density and flexural strength of the Si₃N₄-SiC composites after nitriding are 2.67g·cm^-3 and 48 MPa respectively; the strength is higher than that of other industrial products without gelcasting. Well-developed intertwined fibrous Si₃N₄ crystals grow on the surface of the SiC particles to form a tight microstructure in the Si₃N₄-SiC composites after firing.