冲蚀磨损诱导非晶合金涂层表面纳米化及自增强机理研究

项目名称： 冲蚀磨损诱导非晶合金涂层表面纳米化及自增强机理研究

项目编号： No.51475140

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 机械、仪表工业

项目作者： 纪秀林

作者单位： 河海大学

项目金额： 78万元

中文摘要： 本项目从疏浚机具耐磨涂层的实际需求出发，根据前期研究发现的冲蚀磨损诱导非晶合金涂层表面晶化现象，从表面相变的新视角，研究固液两相流中非晶合金涂层的冲蚀磨损机理。为此，本项目首先研究泥浆冲蚀磨损过程中非晶合金涂层表面结构的演变规律，探寻决定表面晶化行为的关键成分与冲蚀条件；然后，研究涂层中冲蚀诱导纳米晶的形成、长大、磨耗及新的纳米晶再生成的动态过程，分析纳米晶的种类、分布及数量与冲蚀磨损参数的关系，并阐明表面纳米化与冲蚀磨损的关联作用；进而探寻表面纳米化对冲蚀磨损性能的影响；再结合差热分析优化涂层成分，调控纳米晶的选择性析出，揭示冲蚀诱导表面纳米化提高冲蚀磨损性能的自增强机理。本项目的实施，不但从一个新角度揭示隐藏在非晶合金磨损表象背后的磨损机理，为非晶合金涂层的成分设计提供新思路，而且有望发挥非晶合金的亚稳态特性、制备具有自增强效应的耐磨涂层，并为提高疏浚机具的使用寿命提供理论依据。

中文关键词： 冲蚀磨损；表面纳米化；相变；磨损机理；非晶合金

英文摘要： This project is based on the actual needs from the wear-resistant coating of dredging equipments. According to the previous findings about the erosion-induced surface crystallization of amorphous alloy coating, the erosion mechanism of amorphous alloy coatings under the solid-liquid two-phase flow will be researched from a new perspective of surface phase transformation. So this project will firstly study the surface structure evolution of amorphous alloy coating during slurry erosion wear and explore the key compositional and erosive requirements determining the behavior of surface crystallization. Then the dynamic process of erosion-induced nanocrystallization, including precipitation, growing, attrition and a new generation of nanocrystallines will be studied. The relationship between the erosion parameters and the nanocrystalline's type, distribution and quantity will be analyzed. And the mutual influence of surface nanocrystallization and erosion wear will be clarified. The influence of erosion-resistant performance by nanocrystallization will be explored. With the differential thermal analysis, the new amorphous coating composition will be optimised and the selective precipitation of nanocrystallines will be adjusted. The self-reinforcing mechanism of the erosion-induced surface nanocrystallization improving the erosion-resistant properties will be revealed. Implementation of this project will not only be expected to reveal the wear mechanism of amorphous alloy behind the appearance of erosion from a new angle and provide a new idea for the composition design of amorphous alloy coatings but also to play the metastable characteristics of amorphous alloy and to fabricate a wear-resistant coating with self-reinforcing effect, and will also provide a theoretical basis for improving the life of the dredging equipments.

英文关键词： Erosion wear;Surface nanocrystallization;Phase transformation;Wear mechanism;Amorphous alloy