TY - JOUR
T1 - Sintering and crystallization of off-stoichiometric BaO·Al2O3·2SiO2 glasses
AU - Sung, Yun Mo
AU - Ahn, Jae Woo
N1 - Funding Information:
The authors wish to thank Mr. Bum-Ho Jung at Daejin University for helping DTA work. This study was supported by the Daejin University Research Grants of 1998.
PY - 2000/10
Y1 - 2000/10
N2 - Glass-ceramics with off-stoichiometric celsian composition of 50 wt% BaO·2SiO2-50 wt% BaO·Al2O3·2SiO2, (B2S-BA2S) were fabricated and investigated for their sintering and crystallization characteristics. (B2S-BA2S) glass powder showed a melting temperature much lowered compared to that of stoichiometric BaO·Al2O3·2SiO2 (BA2S) glass powder and high sintering ability. (B2S-BA2S) glass powder containing B2O3, (B2S-BA2S)B and that containing B2O3 and TiO2, (B2S-BA2S)BT revealed much lowered crystallization peak temperatures, but rather low sintered density. By applying Kissiger analysis to differential thermal analysis (DTA) data activation energy values for crystallization were determined as 265, 195 and 242 kJ/mol, respectively for (B2S-BA2S), (B2S-BA2S)B and (B2S-BA2S)BT glasses. X-ray diffraction (XRD) patterns from all the glass-ceramics crystallized at 1100 °C for 4 h revealed formation of crystalline phases of β-BaO·2SiO2, monocelsian and hexacelsian. (B2S-BA2S) glass-ceramics crystallized at 1400 °C for 4 h showed formation of β-BaO·2SiO2 and monocelsian phases with only trace of metastable hexacelsian phase.
AB - Glass-ceramics with off-stoichiometric celsian composition of 50 wt% BaO·2SiO2-50 wt% BaO·Al2O3·2SiO2, (B2S-BA2S) were fabricated and investigated for their sintering and crystallization characteristics. (B2S-BA2S) glass powder showed a melting temperature much lowered compared to that of stoichiometric BaO·Al2O3·2SiO2 (BA2S) glass powder and high sintering ability. (B2S-BA2S) glass powder containing B2O3, (B2S-BA2S)B and that containing B2O3 and TiO2, (B2S-BA2S)BT revealed much lowered crystallization peak temperatures, but rather low sintered density. By applying Kissiger analysis to differential thermal analysis (DTA) data activation energy values for crystallization were determined as 265, 195 and 242 kJ/mol, respectively for (B2S-BA2S), (B2S-BA2S)B and (B2S-BA2S)BT glasses. X-ray diffraction (XRD) patterns from all the glass-ceramics crystallized at 1100 °C for 4 h revealed formation of crystalline phases of β-BaO·2SiO2, monocelsian and hexacelsian. (B2S-BA2S) glass-ceramics crystallized at 1400 °C for 4 h showed formation of β-BaO·2SiO2 and monocelsian phases with only trace of metastable hexacelsian phase.
UR - http://www.scopus.com/inward/record.url?scp=0034299365&partnerID=8YFLogxK
U2 - 10.1023/A:1004870022862
DO - 10.1023/A:1004870022862
M3 - Article
AN - SCOPUS:0034299365
SN - 0022-2461
VL - 35
SP - 4913
EP - 4918
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 19
ER -