钢背/Cu-Pb-Sn轴瓦是重载高速高功率柴油发动机关键部件，在舰船及陆军装备等军工领域获得广泛应用。然而我国钢背/Cu-Pb-Sn轴瓦基础研究和制备技术远落后国际先进水平，高品质轴瓦全部依赖奥地利以及德国进口，其主要瓶颈是钢背/Cu-Pb-Sn轴瓦制备过程中难混溶铅相分布形貌控制困难及界面难以复合。鉴于此，本项目以制备高品质钢背/Cu-Pb-Sn轴瓦复合材料为研究对象，利用高能射线同步辐射技术实时表征研究不同条件下Cu-Pb-Sn合金凝固过程中两相分离过程及富Pb相形态演变，把握影响及控制Pb相分离及微观偏析过程中温度场/流场的关键作用，揭示物理外场及冷却速度对Pb相形成分布及界面形成的作用机理。在此基础上，采用水平连续固/液复合技术制备冶金结合的钢背/铅青铜复合材料，以期获得界面结合良好的双金属复合材料，该项目的顺利实施对我国钢背/Cu-Pb-Sn轴瓦复合材料制备具有积极的科学意义。

Steel/Cu-Pb-Sn bushings are the critical component to fabricate diesel engine with heavy load and high power, and are widely used in the military fields such as ships, armored cars and tanks. However, the fundamental research and fabrication level of our country are far lower than the developed level of the world. The advanced bushings are mainly depended on the import from Austria and Germany. The critical problem is that the control of Pb morphology and distribution is difficult and interface bonding is limited during steel/Cu-Pb-Sn preparation process. Hence, the project takes the high quality steel/Cu-Pb-Sn bimetallic materials as the investigated object, and uses synchrotron radiation of high-energy ray to study the solute transfer behavior and phase separation of Pb phase. The critical role of Pb phase morphology and distribution will be clarified. The formation of Pb segregation during ternary Cu-Pb-Sn alloys solidification will be revealed. Based on the above work, the project utilizes horizontal continuous solid/liquid bonding technology to prepare the high quality steel/Cu-Pb-Sn bimetallic materials with good interface bonding and Pb phase morphology. The project has an important scientific meaning and application value to the steel/Cu-Pb-Sn bushings development of our country.