Zn^(2+)固溶α-堇青石玻璃陶瓷晶化及红外辐射性能

Crystallization and Infrared Radiation Properties of Zn^(2+) Substituted α-Cordierite Based Glass-Ceramics

采用熔融-晶化法制备组成为(Mg,Zn)2Al4Si5O18的Zn2+固溶α-堇青石红外玻璃陶瓷,系统分析Zn2+固溶对材料红外辐射性能的影响,并利用差热(DTA)分析、X射线衍射(XRD)仪、扫描电镜(SEM)等分析方法对ZnO掺杂MgO-Al2O3-SiO2系玻璃陶瓷的晶化行为进行研究。结果表明:Zn2+固溶到堇青石晶体结构中可以有效改善玻璃陶瓷的红外辐射性能,其法向全波段辐射率提高到0.90以上。研究还发现,ZnO掺杂对MgO-Al2O3-SiO2系玻璃陶瓷的晶化行为有重要影响,其促进α-堇青石的析出,抑制μ-堇青石的形成。

The Zn2+ substituted α-cordierite based infrared radiation Glass-Ceramics with the compositions of (Mg, Zn)2Al4Si5O18 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 α-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 μ-cordierite and promote the crystallization of α-cordierite in MgO-Al2O3-SiO2 system glasses.