成形压力对Fe16Al2Cr多孔材料性能的影响

Effect of Pressing Pressure on Performance of Fe16Al2Cr Porous Materials

摘要:

以Fe16Al2Cr预合金粉末为原料，采用模压成形、真空烧结的方法制备了Fe16Al2Cr多孔材料，研究了粉末成形压力与Fe16Al2Cr多孔材料性能的关系。结果表明：小于31 μm的Fe16Al2Cr粉末的压制成形性能较差，压坯强度低；烧结过程中，厚度收缩远大于径向收缩，并随着成形压力的增大而减小；在较高的烧结温度下，成形压力和烧结时间对径向收缩几乎没有影响；而孔隙度、最大孔径和透气度随着成形压力的增大而降低，并随烧结时间延长而增大；增大成形压力，延长烧结时间，有利于提高Fe16Al2Cr多孔材料的剪切强度。

Abstract:

Fe16Al2Cr porous material was prepared by compression molding, vacuum sintering using Fe16Al2Cr pre-alloy powder as raw material. The relationship between powder pressing pressure and Fe16Al2Cr porous material performance was researched. The results show that Fe16Al2Cr powder less than 31 μm of particles size is poor compaction performance and green body strength. In process of the power sintering, the axial contraction is bigger than radial contraction, and decreased with the pressing pressure increased. Pressing pressure and sintering time is almost no effects the radial shrinkage at higher sintering temperature. The porosity, pore size and permeability of Fe16Al2Cr porous material decrease with pressing pressure increases, and increases with the sintering time prolongation. Increasing pressing pressure and sintering time help to improve the shear strength of Fe16Al2Cr porous materials.