Crystallization and microstructures of Y�?�Si�?�Al�?�O�?�N glass�?�ceramics containing main crystal phase Y3Al5O12

Bulletin of materials science

Xiuying Li¹  Anxian Lu¹ 

[1] Department of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$Department of Materials Science and Engineering, Central South University, Changsha 410083, P.R. ChinaDepartment of Materials Science and Engineering, Central South University, Changsha 410083, P.R. China$$

关键词: Yâ€�?�Siâ€�?�Alâ€�?�Oâ€�?�N;    glassâ€�?�ceramics;    heat treatment;    crystalline phase;    microstructure.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

A glass with the nominal composition of 28Y48Si24Al83O17N (in equal percentage) was chosen as parent glass in this paper to prepare Y₃Al₅O₁₂-based glassâ€�?�ceramics. Differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to assess the crystallization process of the parent glass. YAG as the only crystalline phase appears in all glassâ€�?�ceramics produced under 1250°C. A small amount of Oâ€�?-Sialon secondary phase starts to precipitate from parent glass samples as heat treatment temperature increases to 1250°C. Grain size of the dendrite crystal which corresponds to YAG phase increases and the dendrite branches get thickened as heat treatment temperature increases. Moreover, grain size of YAG phase resulting from two-stage heat treatment is much smaller than that of YAG phase obtained by one-stage heat treatment. The results are relevant to developing improved crystallization treatments for glasses with potential for crystallization to YAG-based glassâ€�?�ceramics and for heat treatments of YAG/ð›�?-SiAlON materials.

【 授权许可】

Unknown