Crystallization and Infrared Radiation Properties of Zn2+ Substituted α-Cordierite Based Glass-Ceramics

The Zn2+ substituted alpha-cordierite based infrared radiation Glass-Ceramics with the compositions of (Mg, Zn)(2)Al4Si5O18 were synthesized by the method of crystal growth from a homogenous glass. Infrared radiation properties of this material were measured and analyzed, and the crystallization behaviors were ensured by the methods of DTA, XRD and SEM. The results show that, as the Zn2+ solved into the crystal structure of alpha-cordierite, the infrared radiation rate of this material can be improved effectively, and the vertical emissivity in whole band can reach to 0.90. The adding of ZnO can suppress the precipitation of mu-cordierite and promote the crystallization of alpha-cordierite in MgO-Al2O3-SiO2 system glasses.