礦物棉纖維的非等溫析晶動力學研究

唐續龍; 張梅; 郭敏; 張作泰; 王習東

doi:10.13374/j.issn1001-053x.2011.12.003

礦物棉纖維的非等溫析晶動力學研究

doi: 10.13374/j.issn1001-053x.2011.12.003

1. 北京科技大學冶金與生態工程學院, 北京 100083;
2. 北京大學工學院, 北京 100871

基金項目:

國家自然科學基金資助項目(50874013)

國家重點基礎研究發展計劃資助項目(2007CB613608)

NCET-08-0723)

教育部新世紀優秀人才支持計劃資助項目(NCET-07-0071

詳細信息

通訊作者:
張梅,E-mail:zhangmei@ustb.edu.cn

中圖分類號: TQ343⁺.4
計量
- 文章訪問數: 296
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- 被引次數: 0
出版歷程
- 收稿日期: 2010-10-27
- 網絡出版日期: 2021-07-30

Non-isothermal crystallization kinetics of mineral wool fibers

1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China;
2. College of Engineering, Peking University, Beijing 100871, China

摘要

摘要: 利用差熱分析儀和X射線衍射儀研究了礦物棉纖維的析晶行為.礦物棉纖維的差熱曲線上存在兩個重疊的析晶峰.X射線衍射結果和掃描電鏡分析結果表明該礦物棉在高溫下析出兩個結晶相:鈣鎂黃長石和鈣長石,前者的析晶溫度范圍為850~920℃,后者的析晶溫度范圍為880~1 010℃.利用Ozawa方程和修正的Kissinger方程分析了兩個析晶相的析晶機理和析晶活化能.鈣鎂黃長石的Avrami指數n為0.682,屬于表面析晶機理,與掃描電鏡觀察到的結果相吻合;掃描電鏡觀察到鈣長石生長方式為三維生長方式;計算得到鈣鎂黃長石和鈣長石的晶體生長活化能E_G分別為248 kJ·mol^-1和347 kJ·mol^-1.
- 礦物棉 /
- 析晶動力學 /
- 活化能 /
- 晶體生長
Abstract: The crystallization behavior of mineral wool was investigated by means of differential thermal analysis(DTA) and X-ray diffraction(XRD).DTA curves reveal the presence of two overlap exothermic peaks and XRD results shows that two crystalline phases are separated out:one is akermanite-gehlenite(AlCa₂Mg_0.5O₇Si_1.5),which was crystallized between 850℃ and 920℃;the other is anorthite(CaAl₂Si₂O₈),which was crystallized between 880℃ and 1010℃.The Ozawa method and the modified Kissinger method were used to analyze the crystallization mechanism and the activation energy of crystallization.For the crystalline of akermanite-gehlenite,the activation energy of crystallization and the Avrami exponent are 248kJ·mol^-1 and 0.682 respectively,indicating surface crystallization;whereas for anorthite,the activation energy of crystallization is 347kJ·mol^-1,revealing three-dimensionality of crystal growth according to the results of scanning electron microscopy(SEM).
- mineral wool /
- crystallization kinetics /
- activation energy /
- crystal growth