Lanthanum modification of crystalline phases and residual glass in augite glass ceramics produced with industrial solid wastes

被引：36

作者：

Chen, Hua ^{[1
]}

Li, Baowei ^{[2
]}

Zhao, Ming ^{[2
]}

Zhang, Xuefeng ^{[1
]}

Du, Yongsheng ^{[1
]}

Shi, Yu ^{[2
]}

McCloy, John S. ^{[3
]}

机构：

[1] Inner Mongolia Univ Sci & Technol, Coll Sci, Baotou, Peoples R China

[2] Inner Mongolia Univ Sci & Technol, Key Lab Integrated Exploitat Bayan Obo Multimet R, Baotou, Peoples R China

[3] Washington State Univ, Sch Mech & Mat Engn, Pullman, WA 99164 USA

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2019年 / 524卷

基金：

中国国家自然科学基金;

关键词：

Lanthanum oxide; Augite; Glass ceramics; Residual glass; Crystallization; PHOSPHATE-GLASSES; CR2O3; DIOPSIDE; LA2O3; BEHAVIOR; NUCLEATION; EVOLUTION;

D O I：

10.1016/j.jnoncrysol.2019.119638

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 effects of La2O3 on microstructure and properties of the CaO-MgO-SiO2-Al2O3 glass ceramics, made from Bayan Obo West Mine tailing and fly ash, were investigated. Results showed that 12203 additions up to 2 wt% promoted augite crystallization. Above this concentration, La2O3 suppressed augite crystallization by rather forming lanthanum oxyapatite that acted as a barrier for the growth of augite. Also Cr ions, the key element for the augite nuclei, were enriched in lanthanum oxyapatite. The La3+ cations were found to partially substitute for Ca2+ at the M2 structural sites in clinopyroxene (augite). Nano crystalline clusters, containing La3+, Na+, Ca2+, Mg2+ and Fe3+ in augite-like proportions, were found uniformly dispersed in the residual glassy phase. The glass ceramic with 2 wt% La2O3 shows optimum mechanical properties and chemical durability. The bending strength and Vickers hardness are 238 MPa and 7.57 GPa, acid and alkali-resistance are 97.5% and 98.9%, respectively.

引用

页数：10

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