Abstract
The extrusion forming of silicon nitride produced by imide decomposition was studied to fabricate Si3N4 ceramic parts. Green bodies were prepared from a slurry containing 60% solids (92% Si3N4, 4% Al2O3 and 4% Y2O3), 40% distilled water and 0.12% deflocculant (polyacrylic ammonium) with binder (curdlan). The green bodies were dried after formed by vacuum extrusion, and sintered in the range of 1650 to 1800°C under N2 gas at 0.9MPa. The most dense body (3.22×103kg·m-3) was obtained by sintering at 1800°C for 4h. These results indicate that dense silicon nitride parts can be produced by an extrusion method.
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