(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 分別研究核化溫度、核化時間和晶化溫度對Mg8.88Y5.92Al10.15Si15.22O52.65N7.19(摩爾分數(shù)，%)氧氮玻璃析晶行為的影響。此外，還對比研究了兩步和一步熱處理制度對此玻璃析晶行為的影響。用DSC曲線初步確定玻璃成核和晶化溫度范圍，再用傳統(tǒng)方法確定玻璃的最佳熱處理制度；用X-射線衍射儀鑒定微晶玻璃中的物相；用掃描電鏡觀察微晶玻璃的微觀結(jié)構(gòu)。結(jié)果表明：對于此組成玻璃，熱處理制度嚴重影響微晶玻璃的析晶度和微觀形貌，但對析出相的種類影響較小；所制備的微晶玻璃中均含YMgSi2O5N(48-1632)、MgSiO3(19-0768)和Mg3Al2(SiO4)3 (15-0742)相，其中YMgSi2O5N為主晶相，呈棒狀。
關(guān)鍵字: 熱處理制度；Mg-Y-Al-Si-O-N玻璃；晶相；析晶度；顯微結(jié)構(gòu)
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:A glass with the composition of Mg8.88Y5.92Al10.15Si15.22O52.65N7.19 (in mole fraction, %) was chosen as parent glass. The influence of nucleation temperature, nucleation time and crystallization temperature on the crystallization behavior of this glass was studied. Furthermore, the effect of one-stage heat treatment on the crystallization behavior of this glass was also investigated in comparison with two-stage heat treatment. The temperature ranges for nucleation and crystallization were both determined by DSC curve of the glass. Based on the DSC curve, the optimum heat treatment schedule was determined by classical method. The crystalline phases in the glass-ceramics were identified by X-ray diffraction. The microstructures of the glass-ceramics were observed by scanning electron microscopy. The results indicate that for this glass, heat treatment has great effects on volume fraction of the crystalline phases and the microstructures of the glass-ceramics, whereas the effect on the type of the crystalline phases precipitated is small. All glass-ceramics contain YMgSi2O5N(48-1632), MgSiO3(19-0768) and Mg3Al2(SiO4)3(15-0742) phases. Rod-shape YMgSi2O5N as the dominant phase appears in all glass-ceramics.
Key words: heat treatment schedule; Mg-Y-Al-Si-O-N glasses; crystalline phase; volume fraction of crystalline phases; microstructure
