Abstract
Effects of SiC dispersions on mechanical properties have been studied for the natural mullite (fabricated from natural kaolin and Al2O3 powders)/SiC composite system. The natural mullite/SiC composites were prepared by pressureless reaction-sintering of natural kaolin, Al2O3 and SiC powders. These composites were composed of mullite with columnar-typed grains, fine SiC dispersions and amorphous grain boundary phases. The larger SiC particles (>0.3μm) were dispersed at the grain boundaries, while the finer SiC particles (<0.2μm) were located not only at the grain boundaries but also within the mullite matrix grains. The mechanical properties were strongly improved by these SiC dispersions. The Vickers hardness, fracture toughness and strength were approximately 10 GPa, 300 to 400 MPa and 2.5 to 3.0 MPam1/2, respectively. These values are much higher than those reported for monolithic natural mullites and are comparable to those for advanced mullite ceramics.
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