Abstract
Recent progress of oven wall brick, especially “high density silica brick” developed in U. S. A. was introduced and discussed from the standpoint of a refractory producer.
High density silica brick aiming at the shortening of coking time through higher thermal conductivity can be obtained by the addition of titania, copper oxide or metallic silicon
However, it was recently found that some oven bricks used for a long period had considerably decreased in porosity and therefore increased by 40 percent in thermal conductivity. These phenomena were mainly due to the structural and chemical changes, which were investigated in detail.
The result gave a prospect to make high density silica brick with the porosity of as low as 20-17 percent by selecting raw materials and improving manufacturing procedures without any metallic additive. Physical properties of trial products are shown.
