晶化焼結法によるコーディエライト焼結体の作製とその耐熱衝撃抵抗性

概要

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Four kinds of cordierite ceramics were fabricated by firing the glass compacts having the composition of 2MgO・2Al_2O_3・5SiO_2 and the same composition with small amount of ZrO_2 at 1373 K for 1h at heating rate of 6K/min and 20K/min. Their thermal shock fracture resistance was investigated through a rapid change in bending strength of quenched specimen. The critical quenching temperature difference (ΔT_c) of the sintered bodies with the chemical composition close to cordierite fired at 6K/min was about 650 K, while the ΔT_c=550K for the sintered bodies fired at 20 K/min. On the other hand, the cordierite ceramics with small amount of ZrO_2 revealed to have 500-550 K as their ΔT_c. Although an addition of ZrO_2 to cordierite composition and high heating rate have given rise to higher strength of sintered bodies, no effect on an increase in ΔT_c was recognized because Young's modulus and the thermal expansion coefficient of sintered bodies increased simultaneously.
社団法人日本セラミックス協会の論文
1998-04-01