Sol–gel prepared Al2O3 coatings for the application as tritium permeation barrier
Sol–gel prepared Al2O3 coatings for the application as tritium permeation barrier
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DOI：
10.1016/j.fusengdes.2010.01.021
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发表时间：
2010-12
影响因子：
1.7
通讯作者：
Tianshi Wang;J. Pu;C. Bo;L. Jian
中科院分区：
文献类型：
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作者：
Tianshi Wang;J. Pu;C. Bo;L. Jian
试验包层模块（TBM）系统的关键问题之一是减少氚从铅锂合金中渗透到水/氦冷却剂中。使用氧化铝涂层是解决这一问题的最有前途的方法之一。采用溶胶-凝胶法在铁素体钢基体上制备了结合良好的氧化铝涂层。利用X射线衍射仪（XRD）和场发射扫描电镜（FSEM）对涂层的物相和显微结构进行了分析。在500°C下制备的涂层为非晶态，而在650°C下制备的涂层为γ-Al 2 O3。当煅烧温度升高到1100°C时，生成α-Al 2 O3。粘附良好的涂层的表面光滑且均匀。在涂层中或在氧化皮/合金界面处没有观察到剥落和裂纹。涂层的晶粒尺寸即使在1100°C下也保持非常小（对于1100°C，在30- 40 nm的范围内）。涂层的厚度可以通过改变老化时间和浸渍循环次数来控制。通过这种方法，即使在管道内部，也能保证涂覆复杂几何形状的灵活性。
One of the critical issues in test blanket module (TBM) system is to reduce tritium permeation from Pb–Li into the water/helium coolant. Use of alumina coating is one of the most promising methods to solve this problem. In the present study, well-adhered alumina coatings on ferritic steel substrates were prepared by the sol–gel method. X-ray diffraction (XRD) and field-emission scanning electron microscope (FSEM) were employed to identify the phase and examine the microstructure of the coating. The coating prepared at 500°C is amorphous, while that prepared at 650°C is γ-Al2O3. When calcination temperature is elevated to 1100°C, α-Al2O3is formed. The surface of the well-adhered coating was smooth and uniform. No spallations and cracks were observed in the coating or at the scale/alloy interface. The grain size of the coating remains very small even at 1100°C (in the range 30–40nm for 1100°C). The thickness of the coating can be controlled by changing aging time and the number of dipping cycles. The flexibility to coat complex geometries by this method, even inside tubes, is guaranteed.