Production of powder metallurgy components with radially graded material system by means of segregation

本研究项目的目的是开发一种新的制造工艺，用于生产具有径向梯度层系统的组件。这种新的制造工艺能够生产特殊适应的组件或半成品。这应该通过离心力和分离效应的叠加来实现。为此，实验装置开发与旋转的圆柱形模具粉末压制，这是同时叠加振动。由于分离（偏析），较小的颗粒移动到边缘区域，而较大的颗粒集中在圆柱体的中心。对于实验测试，将使用不同的铝基金属基质复合材料粉末混合物。基质材料（铝粉）和陶瓷增强相（SiC）颗粒的粒度不同。控制偏析导致陶瓷增强颗粒在零件边缘的分数增加。在本研究项目中，不同的工艺变量（粉末的几何形状和尺寸分布，振动的振幅和频率，转速）的影响进行了研究，分析径向梯度粉末系统的发展。

The aim of this research project is the development of a new manufacturing process for producing compo-nents with a radial graded layer system. This new manufacturing process has the ability to produce specifi-cally adapted components or semi-finished products. This should be realized by a superposition of the centrifugal force and the segregation effect. For this purpose, an experimental setup is developed with a rotating cylindrical die for powder pressing, which is simultaneously superimposed with a vibration. Caused by the separation (segregation) the smaller particles move to the edge area, whereas the larger particles concentrate at the center of the cylinder. For the experimental tests different aluminum-based metal matrix composite powder mixtures will be used. The matrix material (aluminum powder) and the ceramic reinforcing phase (SiC) particles differ in their particle size. The controlled segregation leads to an increasing fraction of the ceramic reinforcing particles in the edge of the part.Within this research project, the effects of different process variables (geometry and size distribution of the powder, amplitude and frequency of vibration, rotation speed) are investigated for analysis of the develop-ment of the radial graded powder system.