Al 분말의 수화 반응과 스파크 플라즈마 열처리법으로제조된 알루미나 성형체 연구
Study of Hydrolysis of Al Powder and Compaction of Nano Alumina by Spark Plasma Sintering (SPS)
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Abstract
The Al2O3 with various phases were prepared by simple ex-situ hydrolysis and spark plasma sintering (SPS) process of Al powder. The nano bayerite (b-Al(OH)3) phase was derived by hydrolysis of commercial powder of Al with micrometer size, whereas the bohemite (AlO(OH)) phase was obtained by hydrolysis of nano Al powder synthesized by pulsed wire evaporation (PWE) method. Compaction as well as dehydration of both nano bayerite and bohemite was carried out simultaneously by SPS method, which is used to fabricate dense powder compacts with a rapid heating rate of 100℃ per min. under the pressure of 50 MPa. After compaction treatment in the temperature ranges from 350℃ to 1100℃, the bayerite and bohemite phases change into various alumina phases depending on the compaction temperatures. The bayerite shows phase transition of Al(OH)3→ h-Al2O3 →q-Al2O3 →a-Al2O3 sequences. On the other hand, the bohemite experiences the phase transition from AlO(OH) to g-Al2O3 at 350℃. It shows AlO(OH) g-Al2O3→d-Al2O3 →q-Al2O3 →a-Al2O3 sequences. The g-Al2O3 compacted at 550oC shows a high surface area (138 m2/g).
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