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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 저널정보
- 한양대학교 청정에너지연구소 Journal of Ceramic Processing Research Journal of Ceramic Processing Research 제9권 제2호
- 발행연도
- 2008.4
- 수록면
- 111 - 117 (7page)
이용수
초록· 키워드
YAG (yttrium aluminum garnet, Y₃Al5O₁₂) powders were synthesized by a mechanochemical solid reaction of Y₂O₃with
AlOOH and γ-Al₂O₃. Phase development of the resultant YAG samples during grinding and calcination was compared
between two types of aluminum source. The reaction of Y₂O₃ with AlOOH was activated by mechanical energy and the use
of fine powder instead of heat energy, leading to the direct formation of YAG without second phases such as YAP (yttrium
aluminum perovskite, YAlO₃) and YAM (yttrium aluminum monoclinic, Y₄Al₂O9) with calcination at 800oC. However, the
sample containing g-Al₂O₃ and Y₂O₃ yielded YAP along with YAM after calcination at 900oC because g-Al₂O₃ transformed into
α-Al₂O₃, which made it difficult to diffuse Al₃+ into Y₂O₃ lattice, and then by increasing temperatures to 1300oC, a wellcrystallized
phase of pure YAG was obtained. YAG powders showed good sinterability, although the samples were hardly
agglomerated after grinding. After the same calcination of two samples at 1000oC, YAG samples containing the AlOOH and
γ-Al₂O₃ were densified to ~96.7 and ~92.9% of the theoretical density, respectively, by sintering at 1600oC for 4 h under
atmospheric conditions. It is concluded that the use of a fine, type of starting materials and grinding time are believed to be
important factors in the mechanochemical synthesis of YAG.
#YAG
#YAG
#Synthesis
#Synthesis
#Phase formation
#Phase formation
#Transition alumina
#Transition alumina
#Sintering
#Sintering
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