非等溫晶化動力學
(中南大學材料科學與工程學院, 長沙 410083)
摘 要: 采用非等溫差示掃描量熱分析方法， 結合X射線衍射和紅外光譜， 研究了Al1.49Si1.45Zr0.26(TiCaMg)0.37O6.43非晶晶化動力學。 結果表明： 非晶在1223～1273 K附近發(fā)生了四方氧化鋯的析出反應， 析晶活化能為518~538 kJ/mol； 在1423~1473 K附近發(fā)生了莫來石和方石英的析出反應， 其析晶活化能為522~545 kJ/mol， 且氧化鋯的存在能有效地降低莫來石的析晶活化能。
關鍵字: 氧化鋯; 莫來石; 晶化; 動力學; 活化能
Al1.49Si1.45Zr0.26(TiCaMg)0.37O6.43
amorphous bulk
（School of Materials Science and Engineering, Central South University,
Changsha 410083, China）
Abstract: The non-isothermal crystallization kinetics of the Al1.49Si1.45Zr0.26(TiCaMg)0.37O6.43 glass was investigated by differential scanning calorimetry(DSC), infrared spectra(IR) and X-ray diffractrometry(XRD). The results show that there are two kinds of crystallization reactions during the heat treatment for Al1.49Si1.45Zr0.26(TiCaMg)0.37O6.43 glass. The first crystallization reaction occurs at 1223-1273 K and the tetragonal zirconia oxide forms, the crystallization activation energy is 518-538 kJ/mol. The second crystallization reaction occurs at 1423-1473 K. The main phases precipitated are mullite and cristobalite, the crystallization activation energy is 522-545 kJ/mol. The zirconia oxide existence can decrease the crystallization activation energy of mullite effectively.
Key words: zirconia oxide; mullite; crystallization; kinetics; activation energy
