The Effect of Carbon Sources on the Thermal Shock Properties of MgO-C Refractories

Tuba Bahtli,Derya Yesim Hopa,Veysel Murat Bostanci,Serife Yalcin Yasti

doi:10.13189/ujms.2018.060501

Abstract

Thermal shock resistance of MgO-C refractories, which were used in the iron and steel industry, by incorporation of pyrolytic carbon black obtained by waste tire pyrolysis was investigated. The effect of porosity on the thermal shock resistance of those refractories as a function of carbon source (graphite or pyrolytic carbon black) was also examined in the current study. The microstructure and fracture surfaces were characterized using the Scanning Electron Microscopy (SEM). Experimental studies showed that refractories produced by the use of pyrolytic carbon black had higher amount of porosity and lower thermal shock resistance than refractories containing flake graphite.

Highlights

Refractories are materials that are resistant to high temperature, and used as furnace linings for elevated temperature materials processing [1]
While the bending strength of K1 composition produced with resin and graphite admixtures had the highest bending strength value as similar to the Cold Crushing Strength (CCS) value, 3-point bending strength values decreased with pyrolytic carbon black addition
The initial strength values were lower than the C1, it was observed that the C2 and the C3 refractories by incorporation of pyrolytic carbon black had generally higher strength ratio values

Summary

Introduction

Refractories are materials that are resistant to high temperature, and used as furnace linings for elevated temperature materials processing [1]. The MgO-C (magnesia-carbon) bricks are widely used in the steel industry, electric arc furnaces, and basic furnaces because of its excellent resistance to erosion, corrosion and thermal shock, and hot strength [2,3,4]. Carbon refractories contain a high amount of carbon content up to 12–20 wt%, and the main carbon source is flaky graphite due to its non-wetting nature and anisotropic properties, excellent corrosion resistance from molten metal and slag attack [4, 5]. Bending strength increases with increasing the graphite content in a carbon-bonded system [1]

Methods

Results

Conclusion