Growth of MgAl2O4/MgO eutectic crystals by the micro-pulling-down method and its characterization
Growth of MgAl2O4/MgO eutectic crystals by the micro-pulling-down method and its characterization
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DOI：
10.1016/j.jeurceramsoc.2005.01.032
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发表时间：
2005
影响因子：
5.7
通讯作者：
J. H. Lee;A. Yoshikawa;T. Fukuda
中科院分区：
文献类型：
--
作者：
J. H. Lee;A. Yoshikawa;T. Fukuda
用微下拉方法成功地生长出了MgAl2O4/MgO共晶纤维和棒状物，并对生长的晶体进行了微观结构和光学特性的表征。以6-120 mm/h的生长速度生长出直径0.3-1 mm、长约500 mm的共晶纤维和直径5 mm、长约60 mm的棒材。共晶纤维具有均匀的显微结构，其中的MgO纤维/晶须沿尖晶石基质中的生长方向排列。生长的晶体在肉眼下看起来是半透明的。进行了光学和取向表征。用盐酸选择性腐蚀可以很容易地去除第二相氧化镁，从而得到多孔的单晶体。
MgAl2O4/MgO eutectic fibers and rods have been grown successfully by the micro-pulling-down method, and the microstructures and optical characterizations of grown crystals were performed. MgAl2O4/MgO eutectic fibers of 0.3–1mm in diameter and about 500mm in length, and the rods having 5mm in diameter with approximately 60mm in length have been grown with the 6–120mm/h of growth speed. The eutectic fibers showed homogeneous microstructure in which MgO fiber/whisker aligned to the growth direction in the MgAl2O4(spinel) matrix. The grown crystals looked semitransparence under naked eyes. Optical and orientational characterizations were performed. The second phase of MgO was easily removed by selective etching with hydrochloric acid, and then porous single crystalline bodies were obtained.