Synthesis and characterization of calcium aluminate compounds from gehlenite by high-temperature solid-state reaction

被引：39

作者：

Pan, Xiaolin ^{[1
]}

Zhang, Di ^{[1
]}

Wu, Yan ^{[1
]}

Yu, Haiyan ^{[1
]}

机构：

[1] Northeastern Univ, Sch Met, 3-11 Wenhua Rd, Shenyang, Liaoning, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2018年 / 44卷 / 12期

关键词：

Gehlenite; Calcium aluminate; Mineral transition; Microstructure; Self-pulverization; Sintering; GLASS-CERAMICS; LASER MATERIAL; ANORTHITE; MECHANISM; CA2AL2SIO7; MIXTURES; KINETICS;

D O I：

10.1016/j.ceramint.2018.04.186

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The mineral transition mechanism and self-pulverization property of the sintered products in the Ca2Al2SiO7CaO system were systematically studied using pre-synthesized gehlenite determined by XRD, SEM, FTIR and particle size analyses. The minerals of Ca12Al14O33, CaAl2O4, Ca3SiO5 and Ca2SiO4 are formed by the direct reactions of Ca2Al2SiO7 with CaO. CaAl2O4 reacts with CaO to form Ca12Al14O33 or Ca3Al2O6, while Ca3SiO5 reacts with Ca2Al2SiO7 to form Ca2SiO4 and calcium aluminate compounds. The sintered products mainly contain CaAl2O4, Ca12Al14O33 and Ca2SiO4 at 1350 degrees C or above 1500 degrees C when the molar ratio of CaO to Al2O3 is 1.0. Increasing the sintering duration or the CaO consumption promotes the transition of Ca2Al2SiO7 to Ca2SiO4 and calcium aluminate compounds when sintered at 1350 degrees C, which accordingly improves the self-pulverization property of the sintered products. The formed minerals of Ca12Al14O33, CaAl2O4 and Ca2SiO4 transform into Ca2Al2SiO7 again when the sintering temperature is between 1400 degrees C and 1450 degrees C, and the corresponding self-pulverization property of the sintered products deteriorates sharply.

引用

页码：13544 / 13550

页数：7

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