Structure Evolution and Reaction Mechanism of Al4SiC4 Ceramics in High-temperature Reduction Atmosphere
Al4SiC4 is a promising additive for carbon-containing refractories to improve their oxidation resistance.Al4SiC4 ceramics were synthesized from Al,Si,and C powders,which were then placed in the temperature range of 1000-1500℃ to simulate the real environment for carbon-containing refractory materials.It is experimentally showed that Al4SiC4 initially reacted with CO to form Al2O3,SiC,C and aluminosilicate glass in a reduction atmosphere in the temperature range 1000-1400 ℃.When the heating temperature was raised to 1500 ℃,Al2O3 and SiC began to react with CO to form Al6Si2O13(mullite).The two reaction processes led to the formation of protective films on surface of the carbon-containing refractories,thus inhibiting the oxidation process.
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