Abstract
The effects of using nanosized carbon black in the range of 0–10 weight percentages on the physical and thermomechanical properties of –graphite refractory composites were investigated. Nanosized carbon black addition improved the relative heat resistance and oxidation resistance of composites. The bulk density of the composites is reduced with increasing carbon black (CB) content. Increase in CB content first causes an increase in the apparent porosity, but at more than 3 wt% amount of CB, a decrease of apparent porosity was observed. The cold crushing strength (CCS) increased with increasing CB content in samples fired at and in samples fired at when the content is increased to 3 wt%, but the CCS decreased with increasing CB content in samples fired at when the CB content was less than 3 wt%. The composite without CB exhibits the highest value of CCS at firing temperature of .
Highlights
Al2O3–SiC–SiO2 refractory composites have been widely used as a castable refractory in several applications in the iron and steel making industry
The results showed that the relative heat resistance of composites increased with the amount of carbon black
Increase in carbon black (CB) content first causes an increase in the apparent porosity, but at larger amounts of CB, a decrease of apparent porosity was observed
Summary
Al2O3–SiC–SiO2 refractory composites have been widely used as a castable refractory in several applications in the iron and steel making industry. Al2O3– SiC–SiO2–C refractory composites are commonly used in the iron and steel making industry, especially in blast furnace iron/slag runners. With the advent of quality steel making processes, it became essential to opt for good quality refractories, especially monolithic castables which were suitable in the presence of molten slag and metal [2]. The use of graphite as a carbon source has many advantages in refractory applications [3]. It has a high melting point and promotes the improvement of the corrosion resistance of the refractory, mainly due to its lower wettability by metal and slag. These composites have a few disadvantages, such as oxidation of graphite and reduction of fracture strength and Young’s modulus because of the presence of graphite flakes
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