International Journal of Minerals Metallurgy and Materials
·
2023
·Vol. 30
·期 4
·756-765
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IF 4.8
Liu Yunsong,Wang Enhui,Xu Linchao,Yang Tao,He Zhijun,Liang Tongxiang,Hou Xinmei
Different amounts of AlON have been introduced in calcium hexaaluminate (CA 6 ) using two approaches, that is, one-step and two-step methods, to improve the slag resistance of CA 6 . A one-step method can directly sinter the mixtures combining Al 2 O 3 , CaCO 3 , and Al in flowing nitrogen, in which AlON clusters are always formed because of the poor wettability of Al by Al 2 O 3 , leading to the high porosity of CA 6 /AlON composite. In a two-step method, CA 6 and AlON are prepared separately and then mixed and sintered in flowing nitrogen. Compared with the sample prepared by the one-step method, CA 6 and AlON in composite by the two-step method are more uniformly distributed, and the optimized amount of AlON added is 10wt%. The slag corrosion and penetration test shows that the CA 6 /AlON composite using the two-step method exhibits superior slag corrosion protection. The promoted effect of AlON on slag penetration and corrosion resistance is also discussed.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2022
·
IF 6.364
Yunsong Liu,Yuying Gao,Enhui Wang,Guangyao Chen,Enxia Xu,Fei Zhao,Yunsong Zhao,Chonghe Li,Xinmei Hou
The interfacial behavior between CaAl 12 O 19 -MgAl 2 O 4 spinel (CA 6 -MA) crucible and molten wrought Ni-based superalloys during the vacuum induction melting process have been comprehensively investigated, with Al 2 O 3 crucible included for comparison. Experimental and theoretical results suggest that CA 6 -MA crucible exhibits higher thermodynamic stability and poor wettability to the superalloy melt. Benefited from these merits, the superalloy ingot with cleaner surfaces and more metallic luster is obtained in the CA 6 -MA crucible. Furthermore, the total oxygen content in the superalloy ingots obtained from CA 6 -MA crucible is 17.9 ppm, which is considerably lower than that from Al 2 O 3 crucible (29.7 ppm). These results indicate that CA 6 -MA crucible can be a promising candidate for melting wrought Ni-based superalloys.
研究领域:
材料科学
·
冶金工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2022
·Vol. 15
·期 3
·793
·
IF 3.748
Hai Tang,Yuhao Zhou,Wenjie Yuan
To investigate the action mechanism of titanium, the effects of different Ti-bearing compounds, including CaTiO3, MgTiO3, and nano-TiO2, on the properties of alumina–magnesia castables were studied. By analyzing the phase compositions, microstructures, and physical and mechanical properties of the castables, it was demonstrated that an intermediate product, CaTiO3, was first generated. This was then consumed by solid-solution reactions, and titanium was involved in the liquid formation as the temperature increased. The solid-solution reaction of CA6(CaAl12O19) was more prominent due to the incorporation of more titanium in the crystal lattice of CA6instead of spinel (MgAl2O4). Moreover, the liquid formation was strongly promoted when more titanium accompanied the calcium, which finally accelerated the densification and improved the strengths of alumina–magnesia castables. On the whole, castables with CaTiO3addition presented higher bulk density and excellent strength after the heat treatment. Besides, the castables with 2 wt.% CaTiO3contents were estimated to possess greater thermal shock resistance.Keywords:Ti-bearing compounds;CA6;spinel;castables
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Research and Technology-JMR&T
·
2021
·
IF 5.039
Xiao-jun Wang,Song-tong Xuan,Ming Feng,Yu-ming Tian
The in-situ formed MgAl 2 O 4 –CaAl 12 O 19 (MA–CA 6 ) composites were fabricated in this study. To clarify the influence of the evolution of CA 6 phase on the properties of MA–CA 6 composites, the sintering temperature was carried out at 1200–1700 °C for 2 h. The results show that the growth and development of CA 6 grains improves the densification and flexural strength of MA–CA 6 composites. The formation of MA phase occurs at 1200 °C, while the CA 6 phase is formed by the reaction of CaAl 4 O 7 (CA 2 ) and Al 2 O 3 appears at 1400 °C. The plate-like CA 6 grains intersect with each other, presenting regular hexagonal morphology with a high aspect ratio at 1500 °C. The CaO–Al 2 O 3 –SiO 2 phase acts as an interface phase to regulate the growth and development of MA and CA 6 grains. The CA 6 phase was crystallized from the transient liquid phase CaO–Al 2 O 3 –SiO 2 to significantly increase its thickness at 1600 °C. At the same time, as the sintering temperature rises, the apparent porosity of the sample decreases from 24% at 1400 °C to 4% at 1600 °C, and the flexural strength correspondingly increases from 96.6 MPa to 167 MPa. However, the suitable sintering temperature should not exceed 1600 °C for better properties of the composites.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Yichong Li,Huizhong Zhao,Han Zhang,Jun Yu,Wei Wang,Jiulin Xu
Ferrotitanium slag (FTS) is the waste product that has gained attention as a potential calcium hexaaluminate (CA 6 ) resource in recent years. In this study, the phase distribution of FTS and CA 6 aggregate was compared, and its effect on the cryolite resistance of castables was further studied. Scanning electron microscopy and least-squares refinement program were used to characterize the phase distribution and crystallographic parameters of ferrotitanium slag. Computational and experimental results demonstrate that ferrotitanium slag contains denser and larger hibonite crystals compared to synthetic calcium hexaaluminate. Ti element exists in the hibonite crystal in the form of coupled substitution or direct substitution of Al 3+ . Performance evaluation in refractory castables also confirms the resulting improvement in corrosion resistance.
研究领域:
材料科学
·
冶金工程
✓ 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）