Effect of Al Speciation on the Structure of High-Al Steels Mold Fluxes Containing Fluoride

2016 ◽  
Vol 99 (12) ◽  
pp. 3941-3947 ◽  
Author(s):  
Jinxing Gao ◽  
Guanghua Wen ◽  
Ting Huang ◽  
Binwen Bai ◽  
Ping Tang ◽  
...  
Keyword(s):  
Al Speciation ◽  
Mold Fluxes

scholarly journals The Influence of Al2O3/SiO2 Ratio on the Viscosity of Mold Fluxes

2008 ◽  
Vol 48 (6) ◽  
pp. 739-746 ◽  
Author(s):  
Zuotai Zhang ◽  
Guanghua Wen ◽  
Ping Tang ◽  
Seetharaman Sridhar
Keyword(s):  
Mold Fluxes

Non-isothermal Crystallization Kinetics of Mold Fluxes for Casting High-Aluminum Steels

2017 ◽  
Vol 48 (6) ◽  
pp. 2949-2960 ◽  
Author(s):  
Lejun Zhou ◽  
Huan Li ◽  
Wanlin Wang ◽  
Zhaoyang Wu ◽  
Jie Yu ◽  
...  
Keyword(s):  
Crystallization Kinetics ◽  
Isothermal Crystallization ◽  
Isothermal Crystallization Kinetics ◽  
Mold Fluxes ◽  
Kinetics Of ◽  
High Aluminum

27Al NMR Study of Al-Speciation in Aqueous Alumina-Sols

2006 ◽  
Vol 38 (1) ◽  
pp. 25-35 ◽  
Author(s):  
M. Nofz ◽  
J. Pauli ◽  
M. Dressler ◽  
Ch. Jügeg ◽  
W. Altenburg
Keyword(s):  
27Al Nmr ◽  
Al Speciation ◽  
Nmr Study

scholarly journals Towards Chloride-Free Organic Electrolytes for Rechargeable Aluminum Batteries

2021 ◽  
Author(s):  
Zaher Slim ◽  
Erik Menke
Keyword(s):  
Room Temperature ◽  
Practical Realization ◽  
Organic Electrolytes ◽  
Al Speciation ◽  
Electrochemically Deposited ◽  
Major Shortcoming ◽  
Experimental Approaches ◽  
High Consistency ◽  
Free Environment ◽  
Complex Ion

The corrosivity of chloride-based electrolytes is a major shortcoming in the practical realization of rechargeable aluminum batteries. Herein, the effect of Cl- on Al speciation and electrochemistry in tetrahydrofuran was measured by employing theoretical and experimental approaches for three systems: Al(OTF)3/THF, Al(OTF)3 plus LiCl in THF, and AlCl3/THF. The high consistency between measured and computed spectroscopic aspects associated with Al(OTF)3/THF electrolyte provided both a rationale for understanding Al complex-ion formation in a Cl- free environment and an approach for examining the effect of Cl- on Al speciation. Room-temperature Al plating was achieved from dilute solutions ([Al] = 0.1M) at potentials ≥ 0V (vs. Al⁄Al3+). Cl- is found to enable facile Al plating and SEM reveals that Al is electrochemically deposited as nanocrystalline grains.

scholarly journals Kinetics of Isothermal Melt Crystallization in CaO-SiO2-CaF2-Based Mold Fluxes

2015 ◽  
Vol 46 (5) ◽  
pp. 2374-2383 ◽  
Author(s):  
Myung-Duk Seo ◽  
Cheng-Bin Shi ◽  
Ji-Yeon Baek ◽  
Jung-Wook Cho ◽  
Seon-Hyo Kim
Keyword(s):  
Melt Crystallization ◽  
Mold Fluxes ◽  
Kinetics Of

Investigation the influences of B2O3and R2O on the structure and crystallization behaviors of CaO–Al2O3based F-free mold flux

2018 ◽  
Vol 115 (3) ◽  
pp. 304 ◽  
Author(s):  
Jiangling Li ◽  
Bowen Kong ◽  
Xiangyu Gao ◽  
Qingcai Liu ◽  
Qifeng Shu ◽  
...  
Keyword(s):  
Liquidus Temperature ◽  
Mold Flux ◽  
Crystallization Process ◽  
Degree Of Polymerization ◽  
Scanning Calorimetry ◽  
Structural Investigations ◽  
Crystallization Ability ◽  
Mold Fluxes ◽  
New Type ◽  
Positive Effect

The influences of B2O3and R2O on the structure and crystallization of CaO–Al2O3based F-free mold flux were investigated by Raman Spectroscopy and Differential Scanning Calorimetry Technique, respectively, for developing a new type of F-free mold flux. The results of structural investigations showed that B3+is mainly in the form of [BO3]. And [BO3] appears to form BIII–O–Al linkage which will produce a positive effect on forming [AlO4] network. The number of bridging oxygen and the degree of polymerization of [AlO4] network structure for CaO–Al2O3system were also increased with the increasing of B2O3. On the contrary, with the addition of R2O into CaO–Al2O3–B2O3system, the number of bridging oxygen and the degree of polymerization of [AlO4] network were decreased. DSC results showed that the crystallization process became more sluggish with the increase of B2O3, which indicated that the crystallization ability was weakened. While the quenched mold fluxes crystallized more rapidly when introducing R2O. In other word, the crystallization rates of CaO–Al2O3based slags were accelerated by the introduction of R2O. The liquidus temperature and crystallization temperature were decreased with the increasing amount of B2O3or by addition of R2O into CaO–Al2O3system. Only one kind of crystal was precipitated in 8% B2O3and %R2O-containing samples, which was CaAl2O4identified by SEM-EDS. When the content of B2O3increased from 8% to 16%, Ca3B2O6is clearly observed, demonstrating that the crystallization ability of Ca3B2O6is enhanced by the increasing concentration of B2O3in mold flux. The Ca/Al ratio of the generated calcium aluminate has been altered from 1:2 to 1:4 with the increasing of B2O3. The size of CaAl2O4crystal is gradually increased with the addition of R2O. The crystallization ability of CaAl2O4is promoted by R2O.

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