Effects of Carbon Sources on Properties of Reaction-Bonded Silicon Carbide
The carbon black and graphite were used as carbon sources to fabricate reaction-bonded SiC,and the total content of carbon sources was 10％(mass fraction,the same below).The effects of different ratios of carbon black and graphite on properties of reaction-bonded SiC were investigated.The results show that the reaction-bonded SiC with 4％carbon black and 6％graphite has good mechanical properties,the flexural strength and fracture toughness reach to 251.7 MPa and 4.29 MPa·m1/2.The mineral composition of reaction-bonded SiC was measured by XRD,the Rietveld simulation results of XRD patterns were adopted to measure phase content.The free Si content in reaction-bonded SiC with 4％carbon black and 6％graphite is 24.44％(mass fraction).The free Si content in reaction-bonded SiC with 10％graphite reaches to 28.57％(mass fraction),which is higher than that of the former.The decrease of free Si contributes to the improvement of mechanical properties of reaction-bonded SiC.
reaction-bonded SiCcarbon blackgraphitemechanical propertyfree Si
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