TY - JOUR
T1 - Evolutions of rod diameter, molten zone and temperature gradient of oxide eutectic ceramics during laser floating zone melting
AU - Su, Haijun
AU - Shen, Zhonglin
AU - Ren, Qun
AU - Liu, Yuan
AU - Zhao, Di
AU - Liu, Haifang
AU - Fan, Guangrao
AU - Guo, Min
AU - Zhang, Jun
AU - Liu, Lin
AU - Fu, Hengzhi
N1 - Publisher Copyright:
© 2020 Elsevier Ltd and Techna Group S.r.l.
PY - 2020/8/1
Y1 - 2020/8/1
N2 - Laser floating zone melting (LFZM) is an important directional solidification (DS) technique in oxide ceramic fabrication owing to its very high temperature gradient and rapid cooling rate. In this work, variations and evolutions of rod diameter, molten zone, and temperature gradient are explored in fabrication of Al2O3-based eutectic ceramics. At low solidification rate of 4 μm/s, periodical oscillations with almost the same period (~275 s) are produced in melting zone shape/size, as-grown rod diameter, temperature distribution, and temperature gradient. The temperature gradient fluctuates between 3.6 × 103 K/cm and 6.9 × 103 K/cm with an average value of about 5.3 × 103 K/cm. As increasing the solidification rate, the temperature gradient decreases and the periodical oscillation weakens. Based on the evolutions of the temperature field, interface location and molten zone shape, the formation mechanism of periodical oscillation during LFZM processing is evaluated.
AB - Laser floating zone melting (LFZM) is an important directional solidification (DS) technique in oxide ceramic fabrication owing to its very high temperature gradient and rapid cooling rate. In this work, variations and evolutions of rod diameter, molten zone, and temperature gradient are explored in fabrication of Al2O3-based eutectic ceramics. At low solidification rate of 4 μm/s, periodical oscillations with almost the same period (~275 s) are produced in melting zone shape/size, as-grown rod diameter, temperature distribution, and temperature gradient. The temperature gradient fluctuates between 3.6 × 103 K/cm and 6.9 × 103 K/cm with an average value of about 5.3 × 103 K/cm. As increasing the solidification rate, the temperature gradient decreases and the periodical oscillation weakens. Based on the evolutions of the temperature field, interface location and molten zone shape, the formation mechanism of periodical oscillation during LFZM processing is evaluated.
KW - Directional solidification
KW - Laser floating zone melting
KW - Molten zone
KW - Oxide eutectic ceramics
KW - Temperature gradient
UR - http://www.scopus.com/inward/record.url?scp=85084407343&partnerID=8YFLogxK
U2 - 10.1016/j.ceramint.2020.04.190
DO - 10.1016/j.ceramint.2020.04.190
M3 - 文章
AN - SCOPUS:85084407343
SN - 0272-8842
VL - 46
SP - 18750
EP - 18757
JO - Ceramics International
JF - Ceramics International
IS - 11
ER -