高速压制高密度成形的粉末物理特性取决性研究

On the basis of a study on the densification mechanism of high velocity compaction, the effect of the powder physical characteristics on the powder collision, sliding, deformation, and the force transmission, energy conversion, the peak temperature and local metallurgical bonding between powder particles during high velocity compaction will be systematically studied. The powder physical characteristics studied include the powder particle size, particle size distribution, the particle geometry, surface topography and the loose density. The difference of the densification mechanism between the high velocity compaction and the conventional compaction will be disscussed. A mathematical model of the process will be also established through continuous experiments to test and correction, in order to characterize the behavior and features of the law, and provide theoretical guidance for the selection and preparation of the powder with appropriate physical characteristics, which is the most suitable for high velocity compaction, and then the P/M structural parts with high density will be produced.

在对高速压制致密化机制研究的基础上，系统地研究粉末的粒度、粒度分布、颗粒几何形态、表面形貌和松装比重等粉末物理特性对高速压制过程中粉体碰撞、滑动和变形的影响规律以及粉末颗粒界面间力的传递、能量转换、峰值温度和局部冶金结合等的影响规律，探讨高速压制过程中粉体发生致密化的机理以及与普通压制相比有哪些显著的不同，建立粉末物理特性对高速压制成形密度影响规律的数学物理模型，以表征该影响规律的行为与特性。通过不断实验来进行检验和完善，为选择、制备具有合适物理特性的高速压制用粉末及压制出高致密化粉末冶金结构零件提供理论指导。

在对高速压制致密化机制研究的基础上，系统地研究粉末的粒度、粒度分布、颗粒几何形态、表面形貌和松装密度等粉末物理特性对高速压制过程中粉体碰撞、滑动和变形的影响规律以及粉末颗粒界面间力的传递、能量转换、峰值温度和局部冶金结合等的影响规律，探讨高速压制过程中粉体发生致密化的机理以及与普通压制相比有哪些显著的不同，建立粉末物理特性对高速压制成形密度影响规律的数学物理模型，以表征该影响规律的行为与特性。通过不断实验来进行检验和完善，为选择、制备具有合适物理特性的高速压制用粉末及压制出高致密化粉末冶金结构零件提供理论指导。