초록
상압 소결법(pressureless sintering)법을 이용하여 희토류 원소인 lanthanum neodymium을 소결조제로서 첨가하여 단일상 ZrB$_{2 }$및 ZrB$_{2 }$ and ZrB$_{2 }$-ZrC 복합제를 제조하여 그 소결거동과 미세구조에 대하여 X-선회절분석, 주사전자현미경(SEM)을 이용하여 조사하였다. 소결체의 특성은, 단일상 ZrB$_{2 }$의 경우 $2200^{\circ}C$에서 La 1wt%가 첨가된 경우에 상대밀도 96% 정도의 고밀도 소결체를 얻을 수 있었으며, ZrB$_{2 }$ and ZrB$_{2 }$-ZrC 복 합체의 경우 소결 조제를 첨가하지 않은 경우에 가장 놓은 밀도의 소결체를 얻을 수 있었다.
The sintering behaviour of monolithic zirconium diboride (ZrB$_{2 }$) and ZrB$_{2 }$-based composite ZrB$_{2 }$-ZrC were studied using a pressureless sintering technique. The specimens were prepared using commercially available ZrB$_{2 }$ and ZrC powder which were pressed and subjected to pressureless sintering. The effects of lanthanum and neodymium used as sintering aids in the sintering processes were investigated. The sintered specimens were characterized using X-ray diffraction analysis and scanning electron microscopy. The ZrB$_{2 }$ specimen prepared using and addition of 1 wt% lanthanum and pressurelessly sintered at $2200^{\circ}C$ showed the maximum relative density of 96%. The ZrB$_{2 }$-ZrC composite specimen without the addition of any sintering aids exhibits the maximum sintered density but contains significantly detectable amount of secondary phase.
