[1]赵敏,彭家惠,张明涛,等.铝酸盐水泥提高陶瓷模具石膏性能及机理[J].东南大学学报(自然科学版),2014,44(5):1030-1036.[doi:10.3969/j.issn.1001-0505.2014.05.027]
 Zhao Min,Peng Jiahui,Zhang Mingtao,et al.Performance improvement and mechanism of model-gypsum by aluminate cement[J].Journal of Southeast University (Natural Science Edition),2014,44(5):1030-1036.[doi:10.3969/j.issn.1001-0505.2014.05.027]
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铝酸盐水泥提高陶瓷模具石膏性能及机理()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
44
期数:
2014年第5期
页码:
1030-1036
栏目:
化学化工
出版日期:
2014-09-20

文章信息/Info

Title:
Performance improvement and mechanism of model-gypsum by aluminate cement
作者:
赵敏1彭家惠12张明涛1李志新1朱登玲1
1重庆大学材料科学与工程学院, 重庆 400030; 2重庆建大建材有限公司, 重庆 400030
Author(s):
Zhao Min1 Peng Jiahui12 Zhang Mingtao1 Li Zhixin1 Zhu Dengling1
1College of Materials Science and Engineering, Chongqing University, Chongqing 400030, China
2Chongqing Jianda Construction Materials Co. Ltd, Chongqing 400030, China
关键词:
陶瓷模具石膏 铝酸盐水泥 宏观性能 微观机理
Keywords:
modelling gypsum aluminate cement mechanical performances micro-mechanisms
分类号:
TQ177.3
DOI:
10.3969/j.issn.1001-0505.2014.05.027
摘要:
为提高陶瓷模具石膏使用性能,研究了铝酸盐水泥(AC)对模具石膏凝结硬化、强度、耐水及耐溶蚀性能的影响.采用X射线衍射、扫描电镜和差热分析研究了AC作用机理.结果表明:掺入AC可减少拌合水用量,从而延缓了石膏凝结硬化速率;AC掺入使石膏3 d干抗折强度显著增强,且无后期强度倒缩现象;硬化体耐水、耐溶蚀及耐磨损性能大幅提高,吸水率略有下降,6%为最佳AC掺量.机理分析表明:石膏、铝酸盐水泥复合水化形成由针棒状二水石膏、钙矾石晶体及无定形铝胶构成的网状结构,细针状钙矾石穿插于石膏晶隙间,增强了晶间桥接作用及网状结构稳定性,铝胶紧密填充于晶隙内形成密实的晶胶结构,同时覆盖在石膏表面减少了结晶接触点,使结晶稳定性增强,有效提高了模具石膏综合性能;稳定的水化产物及密实的晶胶结构进一步增强了石膏热稳定性能.
Abstract:
The effects of alumiate cement(AC)on the setting and hardening characteristics, mechanical strength, water resistance and corrosion resistance of modeling gypsum were investigated to improve the performances of gypsum models. The mechanisms were analyzed by measurements of XRD(X-ray diffraction ), SEM-EDS(scanning electron microscope-energy dispersive spectrometer)and DSC-TG(differential scanning calorimetry-thermogravimetric). The result shows that less water is needed to reach the equal fluidity compounding with AC. The setting and hardening rate are prolonged. The flexural strength is strengthened greatly after 3 d of hydration with the addition of AC. There is no strength decreasing at later stage. The water-resistance, corrosion-resistance and arasion-resistance properties are all remarkably enhanced. Water absorption is reduced slightly. The optimum amount of AC is 6%. The mechanism analysis show that AFt and AH3 is produced by the hydration of gypsum and AC. A net-structure is produced by the crystal of needle, clavuligerus gypsum interconnected with acicular AFt. The pore space is filled with AH3 and the contact points of crystallization are reduced. A more compacted microstructure is obtained to make the structure stability improved. The thermal stability of gypsum is also improved.

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备注/Memo

备注/Memo:
收稿日期: 2014-01-24.
作者简介: 赵敏(1984—),女,博士生; 彭家惠(联系人),男,博士,教授,博士生导师, pengjh@cqu.edu.cn.
基金项目: 国家自然科学基金资助项目(50872160).
引用本文: 赵敏,彭家惠,张明涛,等.铝酸盐水泥提高陶瓷模具石膏性能及机理[J].东南大学学报:自然科学版,2014,44(5):1030-1036. [doi:10.3969/j.issn.1001-0505.2014.05.027]
更新日期/Last Update: 2014-09-20