论文部分内容阅读
通过对金属镍、镍镀层及Ｎｌ－Ｌａ２ｏ３复合愤层于９００℃、１０００℃时的恒温氧化实验，发现Ｎｌ－Ｌａ２Ｏ３复合镀层的氧化行为明显改善。高分辨电子显徽镜（ＨＲＥＭ）的观测研究表明，Ｎｉ－Ｌａ２Ｏ３复合铰层氧化时，纳米尺寸的ｋａ２Ｏ３颗粒掺人到氧化层中，形成了ＮｉＯ－Ｌａ２Ｏ３复合氧化物层；在氧化层晶界发现了异常原子排列的新现象。由此认为，Ｎｉ－Ｌａ２Ｏ３复合镀层抗高温氧化性能的提高，主要归因于小尺寸的纳米颗粒可微量溶解，成为Ｌａ（３＋）的晶界们聚“源”，阻止Ｎｉ（２＋）的短路向外扩散，从而改善了氧化层的微观结构和生长机制。
The oxidation behavior of Nl-La2O3 composite coating was obviously improved by constant temperature oxidation experiments of Ni, Ni plating and Nl-La2o3 composite anodes at 900 ℃ and 1000 ℃. High-resolution electron microscope (HREM) observations show that, Ni-La2O3 composite hinge layer oxidation, the nano-size ka2O3 particles doped into the oxide layer, the formation of the NiO-La2O3 composite oxide layer; grain boundary in the oxide layer Found a new phenomenon of abnormal atomic arrangement. Therefore, it is considered that the improvement of high temperature oxidation resistance of Ni-La2O3 composite coatings is mainly attributed to the fact that small size nanoparticles can be dissolved in small amounts to become the “source” of La (3+) grain boundaries and prevent the short circuit of Ni (2+) Outward diffusion, thereby improving the oxide layer of the microstructure and growth mechanism.