MgO-C-Al系耐火物の微構造及び特性に及ぼすAlの挙動

概要

論文の詳細を見る
Al metal powder added to MgO-C refractories plays important roles in suppression of carbon-oxidation. Size of Al grain causes difference in the behavior of Al, namely, in microstructure and properties of the refractories. Al reacts with carbon to give Al_4C_3(s) which forms a surface layer about 20 μm thick. Thus, Al grains smaller than 40 μm change to Al_4C_3(s) almost completely during early stages of heating, and then an aggregate of Al_4C_3(s) crystals gradually reacts with CO(g) to form C(s) and Al_4C_3(s) from it's surface. On the other hand, for Al grains larger than 40 μm, an Al_4C_3(s) surface layer is formed and Al(l) left inside vaporizes by crashing through the layer of Al_4C_3(s). As a result, pores are formed, resulting in strengths lower than that for Al grains smaller than 40 μm.
社団法人日本セラミックス協会の論文
1993-04-01