Effect of the Use of SiC-Added Fireclay Brick on Oxide Inclusions in the Bottom-Teeming Ingot

Abstract

In order to reduce the oxide inclusions originated from casting-pit refractories in case of bottom-teeming ingots, SiC-added fireclay brick was used instead of usual fireclay brick as casting-pit refractories.
The effect of the use of these bricks on oxide inclusions was studied comparatively. Moreover, the effect of runner brick was investigated by the same method.
The results were summarized as follows:
1. It was recognized that the content of CaO and SiO₂in oxide inclusions, the number of macroscopic inclusions appeared on the ingot surface were decreased by using SiC-added fireclay brick.
2. It was observed that effect of the runner brick on oxide incluions should not be neglected.