ムライトの焼結及び曲げ強度に及ぼす焼成雰囲気及びV_2O_5添加の影響

概要

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High-purity mullite was sintered in oxidizing(air) and reducing (N_2=H_2=50%) atmospheres, and effects of the firing atmosphere and V_2O_5 addition on the sintering behavior and bending strength of mullite ceramics were investigated. The firing atmosphere did not affect the bulk density of the undoped mullite ceramics sintered at below 1650℃. SiO was formed by the reaction between mullite and H_2 in the reducing firing. Higher bulk densities of the undoped mullite ceramics sintered at 1700℃ in the reducing atmosphere than those sintered in the oxidizing atmosphere were assumed to be caused by the formation of glass phase in pores from the reaction between SiO and H_2O. Addition of 0.1 mass% V_2O_5 yielded mullite ceramics with the highest bulk density irrespective of the sintering atmosphere. High-temperature bending strength of the undoped mullite ceramics sintered in the reducing atmosphere showed a maximum at a lower temperature than that in the case of the ceramics sintered in the oxidizing atmosphere probably because of the presence of the glass phase.
社団法人日本セラミックス協会の論文
1996-10-01