Asset Details
Do you wish to reserve the book?
A Raman and Multinuclear 29Si, 27Al, and 19F NMR Study on the Structural Roles of CaF2 in SiO2–CaO–Al2O3-based Welding Fluxes
Hey, we have placed the reservation for you!
By the way, why not check out events that you can attend while you pick your title.
Oops! Something went wrong.
Looks like we were not able to place the reservation. Kindly try again later.
Are you sure you want to remove the book from the shelf?
A Raman and Multinuclear 29Si, 27Al, and 19F NMR Study on the Structural Roles of CaF2 in SiO2–CaO–Al2O3-based Welding Fluxes
Do you wish to request the book?
A Raman and Multinuclear 29Si, 27Al, and 19F NMR Study on the Structural Roles of CaF2 in SiO2–CaO–Al2O3-based Welding Fluxes
Please be aware that the book you have requested cannot be checked out. If you would like to checkout this book, you can reserve another copy
We have requested the book for you!
Your request is successful and it will be processed during the Library working hours. Please check the status of your request in My Requests.
Oops! Something went wrong.
Looks like we were not able to place your request. Kindly try again later.
Journal Article
A Raman and Multinuclear 29Si, 27Al, and 19F NMR Study on the Structural Roles of CaF2 in SiO2–CaO–Al2O3-based Welding Fluxes
2022
Overview
The efficacy and efficiency of submerged arc welding (SAW) are largely dictated by the physicochemical properties of the employed welding fluxes, including melting point, viscosity, and activity, etc., which are inherently rooted in the microstructure of the fluxes. SiO2–CaO–Al2O3-based fluxes are widely employed for welding high strength low alloy (HSLA) steels. In the present study, the structural roles of CaF2 on SiO2–CaO–Al2O3-based welding fluxes have been systematically investigated through Raman and magic angle spinning-nuclear magnetic resonance (MAS-NMR) techniques. The results showed that originally intact flux structures depolymerized upon increasing content of CaF2. Raman and 29Si NMR results demonstrated that Q2 (Qn, n is the number of bridging oxygens (O0) in one [SiO4]-tetrahedron) increased at the cost of Q3(1Al) (Qn(mAl), m means the number of neighboring aluminate groups), which could be well explained by the interruption of the Si-O-Al linkages. Moreover, as confirmed by 27Al and 19F NMR results, the proportion of AlF6 species increased from 9.9 to 34.2 pct, indicating the substitution of Al–F for Al–O bonds and the depolymerization of the flux structure. The unique behavior of F may offer a theoretical basis for fine-tuning structural unit mobility and element transfer behaviors during the actual welding process.
Publisher
Springer Nature B.V
