Sol-gel Preparation and Infrared Radiation Property of Boron-substituted Cordierite Glass-ceramics

Shuming Wang and Fenghua Kuang School of Materials Science and Engineering,University of Science & Technology Beijing,Beijing 100083,China

摘 要：Boron for aluminum substitution in the cordierite structure has been examined by sol-gel preparation of different samples along the compositional junction Mg2Al4-xBxSi5O18 with x=0,0.5,1,1.5.By increasing the x value from 0 to 1.5 the crystallization behavior changed accordingly.Proper amount B2O3 doping can promote the sintering of amorphous cordierite gel,effectively restrain the precipitation of μ-cordierite and enhance the crystallization of α-cordierite.The substitution of B3+ for Al3+ in cordierite crystal structure can effectively improve the near-infrared spectral emissivity of this cordierite based glass-ceramics.

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