溶胶增强Ni-TiO2纳米复合涂层的热稳定性及其微观机制研究

In the present project, a novel technique, i.e. sol-enhanced nano-composite plating, was used to synthesize a highly dispersed TiO2 nano-particles reinforced nanostructured Ni coating. Correspondingly the negative effect of the agglomerated nano-particles in traditional nano-composite coatings on the thermal stability was solved. The key scientific point in the present project was the mechanism of the thermal stability of the sol-enhanced Ni-TiO2 nano-composite coating. The project systematically investigated (1) the effect of highly dispersed TiO2 on the microstructure of nanostructured Ni; (2) the effect of highly dispersed TiO2 on the mechanical properties of the nanostructured coatings; (3) the interaction between TiO2 and nanostructured Ni during heat treatment. Based on the above investigations, the effect mechanism of highly dispersed TiO2 on the thermal stability of the sol-enhanced Ni-TiO2 nano-composite coating was established. We believe that the present work will provide an important theoretical value for enriching the thermal stability mechanism of nanostructured metals, provide a basis for developing nanostructured coatings and bulk metals with superior high-temperature properties, and play a vital role in insuring the applications of nanostructured metals in aeronautics, astronauti, transportation and energy industries.

本项目采用溶胶增强纳米复合镀技术在电沉积纳米晶Ni中原位引入高度弥散分布的第二相TiO2纳米粒子，避免了传统电沉积纳米复合涂层中因第二相纳米粒子团聚而对涂层热稳定性带来的不利影响。研究的关键科学问题是溶胶增强Ni-TiO2纳米复合涂层的热稳定机制。本项目将深入研究（1）高度弥散TiO2对Ni纳米晶微观结构的影响规律；（2）高度弥散TiO2对涂层力学性能的影响规律；（3）TiO2和Ni纳米晶两者晶粒生长时相互影响规律。在此基础上，揭示高度弥散TiO2对溶胶增强Ni-TiO2纳米复合涂层热稳定性的微观作用机制。本项目研究为完善和丰富纳米金属材料的热稳定机制提供重要的理论价值，为发展耐高温的纳米金属涂层及其块体材料奠定理论基础，对保障纳米金属材料在航空、航天、交通、能源等领域的应用具有重要的意义。

本项目采用溶胶增强纳米复合镀技术在电沉积纳米晶Ni中原位引入高度弥散分布的第二相TiO2纳米粒子，避免了传统电沉积纳米复合涂层中因第二相纳米粒子团聚而对涂层热稳定性带来的不利影响。研究的关键科学问题是溶胶增强Ni-TiO2纳米复合涂层的热稳定机制。本项目将深入研究（1）高度弥散TiO2对Ni纳米晶微观结构的影响规律；（2）高度弥散TiO2对涂层力学性能的影响规律；（3）TiO2和Ni纳米晶两者晶粒生长时相互影响规律。在此基础上，揭示高度弥散TiO2对溶胶增强Ni-TiO2纳米复合涂层热稳定性的微观作用机制。本项目研究为完善和丰富纳米金属材料的热稳定机制提供重要的理论价值，为发展耐高温的纳米金属涂层及其块体材料奠定理论基础，对保障纳米金属材料在航空、航天、交通、能源等领域的应用具有重要的意义。