Interaction between liquid aluminum and NiO single crystals
Interaction between liquid aluminum and NiO single crystals
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DOI：
10.1007/s10853-005-1951-6
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发表时间：
2005-05
影响因子：
4.5
通讯作者：
N. Sobczak;J. Obła̧kowski;R. Nowak;A. Kudyba;W. Radziwill
中科院分区：
文献类型：
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作者：
N. Sobczak;J. Obła̧kowski;R. Nowak;A. Kudyba;W. Radziwill
用座滴法研究了NiO单晶在973-1273 K真空条件下2 h内与铝液的润湿行为。采用光学显微镜、扫描电镜、能谱仪和X射线分析等方法对固液滴偶的结构和化学性质进行了表征。在实验条件下，熔融Al润湿NiO并与之反应生成Al_2 O_3和Ni。这导致最初纯的Al滴与Ni的合金化到过氧化氢组合物，并在NiO衬底内部形成厚的反应产物区域，其结构呈现细氧化铝沉淀物和Al-Ni基质的互穿网络。凝固后的Al-Ni基体和液滴具有相同的相组成，与Al-Ni相图一致，在T < 1128 K时形成Al 3 Ni，在1128 K <T< 1406 K时形成Al 3 Ni 2。Al/NiO电偶的强烈反应性，伴随着液滴的变形、反应产物区的破碎和液滴下凹坑的形成，有助于三线的扰动和在1073-1273 K的表观接触角的形成。这导致了测量的接触角随温度的异常变化，从973 K时的84 °降低到1073 K时的36 °，然后增加到1273 K时的75 °，而结构分析表明在1073 K时完全润湿。
The wetting behavior of NiO single crystal by liquid aluminum has been studied by the sessile drop method under vacuum at 973–1273 K for 2 h. Optical microscopy, SEM, EDS and X-ray analysis were applied to characterize the structure and chemistry of solidified cross-sectioned sessile drop couples. Under tested conditions, molten Al wets and reacts with NiO to form Al2O3and Ni. This leads to alloying of the initially pure Al drop with Ni to the hypereutectic composition and to the formation of a thick reaction product region inside the NiO substrate, whose structure presents interpenetrated networks of fine alumina precipitates and an Al–Ni matrix. After solidification the Al–Ni matrix and the drop have the same phase composition, which is in agreement with Al–Ni phase diagram, showing the formation of Al3Ni atT< 1128 K and Al3Ni2at 1128 K <T< 1406 K. The strong reactivity of Al/NiO couples, accompanied with the drop deformation, fragmentation of the reaction product region and development of a crater under the drop, contributes to the perturbation of the triple line and to the formation of apparent contact angles at 1073–1273 K. This leads to unusual changes of measured contact angles with temperature, decreasing from 84∘at 973 K to 36∘at 1073 K, and then increasing to 75∘at 1273 K, while structural analysis suggests complete wetting at 1073 K.