MgO-C煉瓦における機械的特性の黒鉛量依存性

概要

論文の詳細を見る
MgO-C bricks containing O to 30 vol% flake graphite and expanded graphite were prepared and heat treated at 800 and 1400℃. The dependence of mechanical properties of the MgO-C bricks on the graphite con tent was studied. The maximum values of bending strength, elastic modulus and fracture toughness were obtained at 2 to 3 vol% expanded graphite and at around 5 vol% flake graphite. The effective fracture energy increased with an increase in graphite content up to 30 vol% for expanded graphite. However, no slight increase in effective fracture energy was observed above 20 vol% flake graphite. Thermal shock resistance parameters R"" and R_<st> were calculated based on the data obtained. B"" was not correlated with graphite content. On the other hand, R_<st> remarkably increased above 7 vol% graphite and larger R_<st> was obtained with expanded graphite. Consequently, improvement of the spanning resistance of MgO C brick was expected with expanded graphite.
社団法人日本セラミックス協会の論文
1994-01-01