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고알루미나 세라믹스의 첨가제 첨가에 따른 고온 특성
High-Temperature Characteristics of High Alumina Ceramics Some Additives
HWAHAK KONGHAK, August 1999, 37(4), 598-603(6), NONE
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Abstract
고알루미나 세라믹스에 산화티타늄(TiO2)을 소결용 첨가제로 사용하고, 점토와 zirconia 및 talc 등을 첨가하여 1,500℃와 1,650℃등의 고온에서 제조된 시편의 고온특성과 slag에 대한 내식특성 등을 연구 관찰하였다. 1,500℃에서 소성한 시편이 1,650℃ 시편에 비해 상온 물성과 기계적 강도가 우수하여 소성온도는 1,500℃가 적합하였다. 1,500℃와 1,650℃의소성온도에 따른 corundum, AT 및 baddeleyite상의 변화는 없었다. 점토, zirconia 및 talc 등을 복합 첨가제로 첨가한 시편에서 액상구조가 확인되었다. 고온에서 talc와 zirconia를 첨가한 시편이 열팽창률 및 열간 탄성률이 양호하였다. 고온에서의 내식성은 TiO2만을 첨가한 시편이 복합 첨가제를 첨가한 시편보다 우수한 결과를 나타냈다.
High temperature characteristics and the corrosion resistance to slag were studied by the specimens of the manufactured according to the addition of clay, zirconia, talc and used the titanum oxide as a sintering agent in high alumina ceramics. These specimens were fired under the temperature at 1,500℃ and 1,650℃. The specimen fired at 1,500℃ was a better in the properties at room temperature and the mechanical strengh than that fired at 1,650℃. There was no change of phase between the corundum, AT and baddeleyite at the temperatures 1,500℃ and 1,650℃. The existence of liquid phase was observed in the specimens with the composite additives such as clay, zirconia and talc. The specimen with talc and zirconia was good in the thermal bending strength, linear thermal expansion and elasticity at high temperature. The corrosion resistance of TiO2-added specimen was higher than that of the composite additives specimens.
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