Journal of Sustainable Metallurgy
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2022
·Vol. 8
·期 3
·1117-1129
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IF 3.068
Lu Xingwen,Zhou Ceng,Liu Yuxin,Wang Yujie,Wang Fei
In this study, iron tailings were used as raw materials mixing with Al 2 O 3 , SiO 2 , and/or CaO sintered at 950–1400 °C to produce glass ceramics. In Al 2 O 3 /tailing and Al 2 O 3 /SiO 2 /tailing systems, the newly formed crystalline mullite (3Al 2 O 3 ·2SiO 2 ) reached its maximum content of 83.7 wt% for sample with Al 2 O 3 /SiO 2 /tailing mass ratio of 6/2/2. In Al 2 O 3 /SiO 2 /CaO/tailing system, the content of newly formed anorthite (CaAl 2 Si 2 O 8 ) increased to the maximum of 72.9 wt% for sample with Al 2 O 3 /SiO 2 /CaO/tailing mass ratio of 7/8/4/6 sintered at 1450 °C. The properties of glass ceramic products were significantly improved in samples with high content of crystalline mullite or anorthite and low surface porosity. Obtained glass ceramic in Al 2 O 3 /SiO 2 /tailing system with mass ratio of 6/2/6 showed excellent properties of chemical resistance (99.99%), compressive strength (1061.6 MPa), and low water absorption (0.2%). The high performance of glass ceramics and low leachability of hazardous metals shed light on the potential application of iron tailings in building and decorative materials. Graphical Abstract
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·
IF 3.5
Mengting Jiang,Xiaopeng Li,Tengfei Deng
In this study, aluminum titanate/anorthite (Al 2 TiO 5 -CaAl 2 Si 2 O 8 ) ceramics were fabricated from ferrotitanium slag through phase reconstruction. Stabilization of the ceramic was achieved by migration of Mg element into Al 2 TiO 5 phase. The results indicated that optimal performance was achieved with the addition of 4 wt% MgO and 60 wt% ferrotitanium slag at 1370°C. The ceramic exhibited bulk density of 3.11 ± 0.01 g/cm 3 , thermal storage density of 1.51 kJ/cm 3 , and thermal expansion coefficient of 3.40 × 10 −6 /°C (1000°C), respectively. Additionally, the solid solution of Mg 2+ in the Al 2 TiO 5 lattice reduced the formation of microcracks and enhanced the mass transfer process. Consequently, the sintering temperature decreased from 1415°C to 1370°C while the bending strength increased from 61.25 ± 1.05 MPa to 75.92 ± 7.72 MPa. Furthermore, finite element simulation demonstrated that higher thermal expansion led to concentrated thermal stress, potentially increasing the possibility of ceramic cracking. This research provides a new strategy for preparing low thermal expansion ceramics from titanium-containing solid waste.
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2017
·Vol. 14
·期 5
·957-962
·
IF 1.048
Cuiwei Li,Yao Han,Linghao Wu,Chang-An Wang
Pure anorthite porous ceramics have been fabricated using γ-Al 2 O 3 , CaCO 3 , and SiO 2 as raw materials through foam-gelcasting method. XRD, thermal analysis, SEM, and TEM were used to study the synthesis and grain growth of anorthite during the in situ process. The results indicated that the initiator (ammonium presulfate) took part in the chemical reaction to form CaSO 4 , which played an effective role during synthesis of anorthite. Besides, CaO and CaSiO 2 were the other intermediate phase during synthesis. Anorthite first occurred at 1050°C, and it was the only phase after it sintered over 1260°C. With sintering temperature increasing from 1300°C to 1450°C, the large sphere pore wall got denser and the anorthite grains obviously showed platelike. It was deduced that the preferential growth of anorthite crystals was parallel to the (004) plane.
研究领域:
材料科学
·
无机化学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Applied Ceramic Technology
·
2019
·Vol. 16
·期 6
·2197-2205
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IF 1.074
Linghao Wu,Cuiwei Li,Jing Yang,Hao Li
Porous anorthite/mullite ceramics with both high porosity and high strength have been successfully fabricated by foam-gelcasting and pressureless sintering technology, using α-Al 2 O 3 , SiO 2 , and CaCO 3 as starting materials and MnO 2 as sintering aids. The porous mullite ceramics prepared in this study had 83.3% porosity and 0.3 W/m·K thermal conductivity, exhibited compressive strength value as high as 6.1 MPa. The samples fabricated with mullite content of 30 mol% possessed 79.4% porosity and 5.9 MPa compressive strength showed thermal conductivity as low as 0.19 W/m·K. With the addition of MnO 2 , the properties of the prepared materials varied slightly when mullite content changed in a large scale. The results showed that the addition of MnO 2 promoted the reaction, affected sintering and grain growth, and contributed to high strength and low-thermal conductivity.
研究领域:
材料科学
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陶瓷工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Rui Wang,Xianjie Liu,Haichao Wei,Yanheng Xu,Ruxian Zhou,Zhaohui Huang,Huasheng Zhan,Shulong Ma,Chen Yang
In this work, high temperature resistant materials based on waste electrical porcelain were prepared successfully by pressureless sintering method using waste electrical porcelain with different particle sizes, flint clay and dolomite as raw materials. Effects of sintering temperature and different amounts of flint clay on the properties of the prepared high temperature resistant materials were investigated. The analysis of XRD suggested that the temperature promoted the calcium aluminum silicate → gehlenite → anorthite phases transformation, which can also be proved from SEM images. The mechanical properties and volume stability of materials were improved by the formation of a large amount of interwoven plate-like anorthite. Besides, excessive sintering temperature (1300 °C) had adverse effects on microstructure and mechanical properties . The appropriate amount of flint clay additions led to more plate-like anorthite productions. With 30 wt% addition of flint clay, the sample exhibited the optimum comprehensive performance after sintering at 1250 °C showing the highest flexural and compressive strengths of 32.83 MPa and 89.59 MPa. The bulk density and apparent porosity of samples were 2.21 g/cm 3 and 3.27%, respectively. This study provides an experimental basis for the large-scale high-value utilization and recycling of waste electric porcelain.
研究领域:
材料科学
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环境工程
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陶瓷学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）