Dissolution of carbon from coke and char in liquid Fe-C alloys
Journal Title: Archives of Materials Science and Engineering - Year 2018, Vol 1, Issue 92
Abstract
Purpose: The aim of this paper was to study dissolution of carbon from carbonaceous materials of different origin with different morphology, microtexture and microstructure in the liquid Fe-C alloys. Design/methodology/approach: The dissolution of carbon from coke, char and glassy carbon in the molten Fe-C alloy (initial carbon concentration 2.46 wt.%) at 1350°C was measured and compared with that from graphite. The dissolution of carbon from demineralised coke and char in the Fe-C solution was also examined to study the effect of mineral matter on the carbon dissolution. Findings: The concentration of carbon in the Fe-C solution dissolved from graphite was higher than that from coke and char. Demineralisation of coke and char had a significant effect on the carbon dissolution. The concentration of carbon dissolved from demineralised coke and char in the Fe-C alloy approached the solubility of graphite in this alloy under the same conditions. Results obtained in this work confirmed that ash has a strong effect on the carbon dissolution. Research limitations/implications: Investigations in this paper were conducted at 1350°C. At higher temperatures; (1) the degree of coke and char graphitisation increases changing the microstructure of carbonaceous materials; (2) the ash can melt, and (3) some of the metal oxides in the ash can be reduced by carbon to the metal phase, thereby weakening the effect of ash on the carbon dissolution. Demineralisation of coke was incomplete; it reached 70-80% with some effect on the carbon dissolution. The effect of ash composition and further coke demineralisation on the carbon dissolution at higher temperature will be investigated in the future study. Originality/value: This study demonstrated that dissolution of carbon from coke and char was strongly affected by ash. Reactions of dissolution of carbon from coke and char in liquid Fe-C alloy reached a steady state within 1-2 hours. In this state, the coke/char – metal system was far from equilibrium. The “apparent” activity which can be assigned to carbon in the steady state is below one for graphite with significant implications for metallurgical processes.<br/><br/>
Authors and Affiliations
X. Xing, S. Jahanshahi, J. Yang, O. Ostrovski
Keywords
Related Articles
- EP ID EP389658
- DOI 10.5604/01.3001.0012.5508
- Views 60
- Downloads 0
Composite materials consisting of carbon nanostructures and nanoforms of selected metals
Purpose: The aim of this article is to present various carbon-metal nanocomposites considering their constituent elements and fabrication conditions. Design/methodology/approach: The article outlines the results of micro...
Adhesion of PVD and CVD hard coatings as an essential parameter that determines the durability of coated tools
Purpose: The work is connected with the current trend related to the modification of tool surfaces with PVD and CVD methods through the deposition of coatings to increase their durability. The research r...
Digital Image Correlation and nanoindentation in evaluation of material parameters of cancellous bone microstructure
Purpose: Purpose of this paper is to present the possibilities of the application of the two methods: Digital Image Correlation and nanoindentation in porous bone tissues testing. Firstly, as a tool in the eval...
2D-Finite element analysis of inlay-, onlay bridges with using various materials
Purpose: To compare the impact of different bridge constructions and different loads onstress distribution in bridges.Design/methodology/approach: The study was conducted on 96 computer models ofboth premolars and molars...
Microstructure and properties of CoCr alloys used in prosthetics procedure
Purpose: The aim of this work was to define the influence of manufacturing technology on the chemical composition, surface topography, physicochemical and electrochemical properties of CoCr alloys obtained by casting tec...