Journal of Inorganic Materials (无机材料学报) 2014/29:7 PP.706-710
β-SiAlON whiskers, belts and rods were prepared at 1650–1850 K in N2 atmosphere, respectively, by using Si, Al and Al2O3 powders as raw materials which were pressed into cuboid and burying in Si3N4 grains. The effects of growth conditions on the controllable synthesis of one-dimensional β-SiAlON preparation were investigated in detail, and their growth mechanisms were explored according to the thermodynamic calculations. The results showed that one-dimensional β-SiAlON could be controllably synthesized only by adjusting sintering temperatures. Specifically, β-SiAlON whiskers with 200–400 nm in diameter and 100–1000 in aspect ratio could be obtained at 1650 K. Increasing growth temperature from 1700 K to 1800 K, β-SiAlON belts with thickness of about 200 nm, width of 1-4 μm and length-width ratio in the range of 10-20, were produced. Further increasing temperature to 1850 K, β-Sialon rods were synthesized accordingly. Vapor-solid (VS) growth mechanism was put forward to elucidate the growth of one-dimensional β-SiAlON based on their thermodynamic calculations and microstructures.
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