고상반응법을 이용한 LAS계의 CaCO3와 ZrO2 첨가에 따른 소결체 특성 연구
Sintered body characteristics of LAS by addition of CaCO3 and ZrO2 using a solid-state reaction
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초록
저열팽창 특성을 갖는 난소결 물질인 LAS(Li2O-Al2O3-SiO2)계를 고상 소결로 제조하였다. LAS계의 β-spodumene(Li2O-Al2O3-4SiO2) 조성에 소결 조제로 CaCO3를 첨가하였고, 강도 증가를 위하여 ZrO2를 첨가하였다. 첨가제의양의 변화와 소결 온도의 변화에 따른 소결 특성, 미세 구조, 기계적 특성 및 열팽창 특성에 대하여 조사하였다. 0.1 mol%의 CaCO3을 첨가하였을 때, 치밀화가 증진됨을 미세구조 관찰에 의해 확인하였으며, ZrO2의 첨가로 강도가 증진됨을 확인하였다. Dilatometer로 측정한 열팽창 계수는 선택된 전 조성에서 값이 1.2~1.7 × 10−6/oC임을 확인하였다.
Abstract
LAS (Li2O-Al2O3-SiO2) ceramics were sintered by a solid-state reaction. CaCO3 and ZrO2 were added to the β-spodumene (Li2O-Al2O3-4SiO2) composition of the LAS system for enhancement of sintering behavior and mechanical strength, respectively. We have investigated the sintering characteristics, microstructures, mechanical properties and thermal expansion characteristics according to the change of the amount of additive and sintering temperature of the β-spodumene. At 0.1 mol% CaCO3, the densification of β-spodumene was significantly improved. At 0.04 mol% ZrO2, the strength of β-spodumene was also improved. For all the selected all compositions, the thermal expansion coefficient was measured by a dilatometer, which revealed 1.2 to 1.7 × 10−6/oC.
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