Abstract
In this paper, silicon-modified Al powders (SiO2@Al) were prepared by tetraethyl orthosilicate (TEOS) hydrolysis under alkaline conditions. Using SiO2@Al as additives, a new Al2O3-SiO2 ceramic coating (ASMA) was formed on carbon steel to prevent carbon steel from oxidization at 1250 °C for 120 min. Compared with the Al2O3-SiO2 ceramic coating without additive (AS), ASMA showed a remarkably better anti-oxidation performance, especially during the temperature-rise period. According to the characterization conducted by TG-DTA, XRD and SEM-EDS, it was found that the metallic Al in ASMA melted at 660 °C and reacted with SiO2 on its surface, which generated local high temperature and accelerated the sintering of ceramic raw materials. The mullite and hercynite formed in ASMA also played a major role for enhancing the anti-oxidation performance of ceramic coating.
Highlights
Carbon steel always involves a slab reheating and hot rolling process to obtain thin carbon steel.During the reheating process, slabs suffer from serious oxidation over 1250 ◦ C, which results in weight loss of slabs and energy waste [1,2,3]
The anti-oxidation performances of the coatings with different proportion of SiO2 @Al were investigated by the weight loss during the heating process in muffle furnace
When temperatures ranged from 1200 to 1250 ◦ C, the anti-oxidation performance of coating improved with the increasing amount of SiO2 @Al until 10% and reduced with further SiO2 @Al addition, especially at 1250 ◦ C
Summary
Carbon steel always involves a slab reheating and hot rolling process to obtain thin carbon steel. Slabs suffer from serious oxidation over 1250 ◦ C, which results in weight loss of slabs and energy waste [1,2,3]. Oxidation could potentially lead to serious problems for the surface quality of carbon steel, such as decarburization and micro-defects [4,5]. Different methods have been taken to protect slabs from oxidization during the reheating process. The most effective countermeasure for the reduction of the oxidation intensity is to isolate slabs from oxidants. Reheating in reducing atmosphere, such as vacuum or inert gas atmosphere, is once thought to be an ideal solution. The rigid operation conditions and expensive equipment limit its industrial application [6,7,8]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
