순수알루미나에서 소결거동에 미치는 소결분위기 영향 = The Effect of Sintering Atmosphere on Sintering Behaviors in Pure a Alumina

다국어 초록 (Multilingual Abstract)

On sintering a pure alumina, the effect of sintering atmospheres on the behaviors of sintering has been investigated. When a pure alumina was sintered at 1600℃, N_(2) or O_(2) with different solubility into the pure alumina was chosen as sintering atmospheres. The sintering atmosphere was changed by two methods of sintering in constant atmospheres of N_(2) or O_(2) and atmosphere changes (N_(2)→O_(2) or O_(2)→N_(2)) during sintering after closed pores formed. Below the relative density 99%, these atmospheres did not affect the sintering behaviors of the pure alumina. This result supports the Kang's suggestion that below the relative density 99%, sintering behaviors are governed by a capillary pressure, but contradicts Coble's suggestion that atmosphere gas solubility can affect the densification rate. In cases of N_(2) or N_(2)→O_(2) atmospheres, dedensification was produced, being contrary to the case of O_(2) or O_(2)→N_(2) atmospheres. Especially, when the atmosphere O_(2) with high solubility was changed into the atmosphere N_(2) with low solubility during sintering, densification rate became faster and grain growth rate did slower than those in constant atmospheres, which were explained by the oxygen chemical potential between the specimen surface and pores and the pore size variation.

목차 (Table of Contents)

• Abstract
• I. 서론
• II. 실험 방법
• III. 결과 및 고찰
• IV. 결론
• 참고문헌