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Influences of thermal treatment temperature on microstructures and properties of glass-ceramics from gold tailings.

Authors :
Chen, Weiqian
Li, Yuhong
La, Peiqing
Xue, Yangquan
Li, Zengpeng
Xu, Shipeng
Sheng, Jie
Source :
Ferroelectrics; 2021, Vol. 579 Issue 1, p23-32, 10p
Publication Year :
2021

Abstract

Use CaO-Al<subscript>2</subscript>O<subscript>3</subscript>-SiO<subscript>2</subscript> glass-ceramics from gold tailings in Hanyin as main raw materials, which were prepared by a melting method. In this paper, the effects of nucleation temperature and crystallization temperature on microstructures and properties of the glass-ceramic specimens were investigated. The thermal property of the glass-ceramics was discussed by differential scanning calorimetry (DSC), and microstructure was characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). Methods of a 4-point bending strength test, DIL-402C dilatometer and Archimedes method were used to determine the bending strength, thermal expanding coefficient and density of glass-ceramics. The experiment results indicated that the optimal properties of glass-ceramics were obtained by nucleation at 800 °C for 2 h, and then crystalling at 950 °C for 3 h. XRD analyses demonstrated that the main phase of gold tailings glass-ceramics was augite and diopside (CaMgSi<subscript>2</subscript>O<subscript>6</subscript>), and the minor phase was potassium iron silicate (KFeSi<subscript>2</subscript>O<subscript>6</subscript>). The bending strength, density and thermal expanding coefficient of the glass-ceramics were 128 MPa, 2.840 g/cm<superscript>3</superscript> and 7.85 × 10<superscript>−6</superscript>/°C, respectively. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00150193
Volume :
579
Issue :
1
Database :
Complementary Index
Journal :
Ferroelectrics
Publication Type :
Academic Journal
Accession number :
151933001
Full Text :
https://doi.org/10.1080/00150193.2021.1903264