NI Tianyuan, RU Hongqiang, ZHANG Cuiping, YUE Xinyan, WANG Wei
(Key Laboratory of Material Anisotropy and Texture of Ministry of Education, Northeastern University, Shenyang 110819, Liaoning, China)
Abstract: Using silicon carbide (SiC) and carbon black (C) as raw materials, paraffin wax (PW) as binder, silicon carbide was prepared through reaction sintering combined with low-pressure injection molding. The effects of dispersants on viscosities of the slurries were studied. The influence of carbon content on microstructure and mechanical properties of the silicon carbide ceramics was also evaluated. It was found that optimal slurry with a viscosity of 300 mPa•s was achieved when the hexadecylamine content and solid loading were 1 wt.% and 70 wt.%, respectively. After reaction sintering at 1450 °C, density, porosity, bending strength, fracture toughness and Vickers-Hardness (HV) of SiC sample with 7 wt.% carbon were 2.89 g/cm3, 0.06%, 259 MPa, 4.35 MPa•m1/2 and 2950, respectively.
Key words: low pressure injection molding; reaction sintered silicon carbide; dispersant; carbon content; mechanical properties