<P><B>Abstract</B></P> <P>A new ternary-phase binder system incorporating alumina (Al<SUB>2</SUB>O<SUB>3</SUB>) precursors was successfully developed through process control to improve the sand mo...
http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
https://www.riss.kr/link?id=A107505590
2018
-
학술저널
2223-2230(8쪽)
0
상세조회0
다운로드다국어 초록 (Multilingual Abstract)
<P><B>Abstract</B></P> <P>A new ternary-phase binder system incorporating alumina (Al<SUB>2</SUB>O<SUB>3</SUB>) precursors was successfully developed through process control to improve the sand mo...
<P><B>Abstract</B></P> <P>A new ternary-phase binder system incorporating alumina (Al<SUB>2</SUB>O<SUB>3</SUB>) precursors was successfully developed through process control to improve the sand mold's strength for casting of large objects. Three types of Al<SUB>2</SUB>O<SUB>3</SUB> precursors with different molecular structures, such as Al(OH)<SUB>3</SUB>, Al(OEt)<SUB>3</SUB>, and Al(NO<SUB>3</SUB>)<SUB>3</SUB> were employed in the ternary-phase binder system. A dual-dipping process was developed. The first dipping includes the ternary-phase binder composition and heat treatment at 1000 or 1200°C. The second dipping uses a binary-phase binder composed of TEOS and NaOMe and heat treatment at 1000°C. The results show that sodium aluminosilicate was synthesized in the ternary-phase binder at both temperatures, and amorphous silica was formed only in the ternary composition of TEOS/NaOMe/Al(OEt)<SUB>3</SUB>. In contrast, sodium silicate was formed in the binary-phase binder. The strength of the mold prepared with precursor Al(OEt)<SUB>3</SUB> was higher than those with Al(OH)<SUB>3</SUB> and Al(NO<SUB>3</SUB>)<SUB>3</SUB>, due to its improved glassification efficiency of Al(OEt)<SUB>3</SUB>. Additionally, the mold strength was increased with increasing content of TEOS in the ternary-phase binder composition. Finally, the optimal highest strength was obtained with the ternary-phase binder composition of TEOS/NaOMe/Al(OEt)<SUB>3</SUB> in the mole ratio of 5:1:1<I>.</I> </P>