(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 在氮气保护下由钼电阻炉中加热(1 550~1 580 ℃)制得Y-Al-Si-O-N-F氧氟氮基础玻璃。采用差示扫描量热法(DSC)测定玻璃的玻璃转变温度(tg)和析晶峰温度(tc)。利用XRD结合能谱分析(EDS)鉴定氧氟氮微晶玻璃中的物相，采用扫描电子显微镜(SEM)观察微晶玻璃样品的微观形貌。结果表明：F含量的增加降低玻璃的tg和tc，并影响微晶玻璃的微观结构以及晶体的尺寸和形貌；N含量的增加对析出晶相和微观结构产生较大影响；基础玻璃样品热处理后析出的主晶相为Y2Si2O7，次晶相随N含量的提高由莫来石(Al6Si2O13)转变成Si3Al6O12N2。与基础玻璃相比，微晶玻璃的显微硬度和抗弯强度有一定程度的提高。
关键字: Y-Al-Si-O-N-F；微晶玻璃；热处理；显微结构；力学性能
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:Y-Al-Si-O-N-F oxyfluoronitride glasses were prepared by melting batches at 1 550-1 580 ℃ under N2 atmosphere in a Si-Mo-heated resistance furnace. Differential scanning calorimeter (DSC) was used to determine the glass transition temperature (tg) and crystallization temperature (tc). Crystalline phases in the oxyfluoronitride glass-ceramics were identified by X-ray diffractometry (XRD) and energy dispersion spectrometry (EDS). The microstructures of the glass-ceramics were observed by scanning electron microscopy (SEM). The results show that the addition of fluorine lowers the tg and tc of oxyfluoronitride glasses and affects the microstructures, including crystal size and morphology. Nitrogen affects the crystallization phases and microstructures. Y2Si2O7 appears as the major crystalline phase in all glass-ceramics obtained after heat treatment, and an increase in nitrogen content favors the formation of Si3Al6O12N2 rather than mullite (Al6Si2O13). The glass-ceramics exhibit higher microhardness and bending strength compared with the corresponding glasses with different fluorine or nitrogen contents.
Key words: Y-Al-Si-O-N-F; glass-ceramics; heat treatment; microstructure; mechanical properties
