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作者发现采用热浸镀铝工艺,在一些特殊的条件下将陶瓷插入铝熔液中定向移动后移出,可以在氧化铝陶瓷表面镀上一层厚度为数微米的铝膜。本实验系统地研究氮气流量、铝熔液温度以及陶瓷板与铝液的接触时间等因素对陶瓷表面铝膜覆盖率的影响。结果表明:铝膜覆盖率随氮气流量的增加发生显著变化,先增加后降低;铝熔液温度的提高使得覆盖率峰值对应的氮气流量向低氮气流量侧转移;铝熔液和陶瓷接触时间的增加有助于陶瓷表面热浸镀铝。此外还采用高分辨透射电镜观察了铝膜和陶瓷的连接界面,发现在氧化铝晶粒上外延生长出与铝晶粒之间存在共格关系的新生Al2O3层。
The authors found that the use of hot-dip aluminizing process, under some special conditions will be inserted into the aluminum melt in the directional movement out after the aluminum oxide can be coated with a layer of aluminum thickness of several microns of aluminum film. This experiment systematically studied the influence of nitrogen flow rate, aluminum melt temperature and contact time between ceramic plate and liquid aluminum on the aluminum film coverage rate of ceramic surface. The results show that the coverage rate of aluminum film changes significantly with the increase of nitrogen flow rate, and then increases firstly and then decreases. The increase of aluminum melt temperature leads to the transfer of nitrogen flux corresponding to the peak coverage to the low nitrogen flow rate. The increase helps to hot dip aluminum on the ceramic surface. In addition, the connection interface between the aluminum film and the ceramic was also observed by high-resolution transmission electron microscopy. It was found that a new Al 2 O 3 layer was epitaxially grown on the alumina grains with a coherent relationship with the aluminum grains.