Knowledge Resource Center for Ecological Environment in Arid Area
| 报告编号 | N140017770 |
| Properties of Desert Sand and CMAS Glass. | |
| Bansal, N. P; Choi, S. R. | |
| 英文摘要 | As-received desert sand from a Middle East country has been characterized for its phase composition and thermal stability. X-ray diffraction analysis showed the presence of quartz (SiO2), calcite (CaCO3), gypsum (CaSO4.2H2O), and NaAlSi3O8 phases in as-received desert sand and showed weight loss of approx. 35 percent due to decomposition of CaCO3 and CaSO4.2H2O when heated to 1400 C. A batch of as-received desert sand was melted into calcium magnesium aluminosilicate (CMAS) glass at approx. 1500 C. From inductively coupled plasma-atomic emission spectrometry, chemical composition of the CMAS glass was analyzed to be 27.8CaO-4MgO-5Al2O3-61.6SiO2-0.6Fe2O3-1K2O (mole percent). Various physical, thermal and mechanical properties of the glass have been evaluated. Bulk density of CMAS glass was 2.69 g/cc, Young’s modulus 92 GPa, Shear modulus 36 GPa, Poisson’s ratio 0.28, dilatometric glass transition temperature (T (sub g)) 706 C, softening point (T (sub d)) 764 C, Vickers microhardness 6.3 +/- 0.4 GPa, indentation fracture toughness 0.75 +/- 0.15 MPa.m (sup 1/2), and coefficient of thermal expansion (CTE) 9.8 x 10 (exp -6)/degC in the temperature range 25 to 700 C. Temperature dependence of viscosity has also been estimated from various reference points of the CMAS glass using the Vogel-Fulcher-Tamman (VFT) equation. The glass remained amorphous after heat treating at 850 C for 10 hr but crystallized into CaSiO3 and Ca-Mg-Al silicate phases at 900 C or higher temperatures. Crystallization kinetics of the CMAS glass has also been investigated by differential thermal analysis (DTA). Activation energies for the crystallization of two different phases in the glass were calculated to be 403 and 483 kJ/mol, respectively. |
| 英文关键词 | Sands Glass Crystallization Thermal analysis Chemical composition Thermal stability Glass transition temperature Thermodynamic properties Calcium silicates Quartz Calcite Gypsum Mechanical properties |
| 出版年 | 2014 |
| 语种 | 英语 |
| 国家 | United States |
| 来源学科分类 | 71 - Materials Sciences ; 99F - Physical & Theoretical Chemistry |
| URL | http://r.cnki.net/KCMS/detail/detail.aspx?DbCode=KJBG&dbname=KJBGW&filename=5a02834931c97d1c38a79019 |
| 来源机构 | National Aeronautics and Space Administration |
| 资源类型 | 科技报告 |
| 条目标识符 | http://119.78.100.177/qdio/handle/2XILL650/273937 |
| 推荐引用方式 GB/T 7714 | Bansal, N. P,Choi, S. R.. Properties of Desert Sand and CMAS Glass.,2014. |
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