LAS (β-spodumene)와 Fe2O3 첨가에 따른 Al2TiO5의 소결체 특성 연구
Characteristics of the sintered body of the Al2TiO5 with addition of LAS (β-spodumene) and Fe2O3
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Al2TiO5에 LAS(β-spodumene)와 Fe2O3를 첨가하여 고상법으로 세라믹 소결체를 제조하였다. Al2TiO5에 첨가된LAS는 액상을 형성하고, Fe2O3는 입자 성장을 억제시켜 소결체를 치밀화하였다. 첨가제의 양을 변화시켜 소결특성, 기계적특성 및 열충격 특성에 대하여 조사하였다. Fe2O3가 20 wt% 첨가된 LAS를 Al2TiO5에 20 wt% 첨가하였을 때, 꺽임 강도는120 MPa 이상이었고, 열충격에 대한 저항성은 1200oC 이상으로 우수함을 확인하였다
Abstract
Al2TiO5 ceramics were sintered by a solid-state reaction. LAS (β-spodumene) and Fe2O3 were added to the Al2TiO5 composition for enhancement of sintering behavior such as mechanical strength and thermal shock resistance. The sintered body was much densified by addition of LAS and Fe2O3 because LAS formed the liquid-phase and Fe2O3 suppressed the grain growth. We have systematically investigated the sintering characteristics, microstructures, mechanical properties,and thermal shock resistance according to the change of the amount of additive. When the additive of LAS (20 wt%)-Fe2O3was added to Al2TiO5, it confirmed that superior mechanical properties of the fracture strength of over 120 MPa and the thermal shock resistance of over 1,200oC were achieved.
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