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以聚氨酯泡沫为前驱体,使用气雾化Ni-20Cr粉末为原料配制水基浆料,采用有机泡沫浸渍工艺制备了具有梯度孔结构的泡沫Ni-20Cr合金滤管。研究了不同烧结温度和装填方式对泡沫金属滤管烧结效果及力学性能的影响,并测试了烧结后泡沫滤管的力学性能和透气性能。结果表明:泡沫素坯经低温预烧+高温烧结的两步烧结工艺后可得到收缩均匀的泡沫合金滤管,孔筋结构均匀、无堵孔且复合界面结合良好。其室温压缩屈服强度大于3 MPa,且随着挂浆量的增加其屈服强度可达4.43 MPa;由于泡沫合金滤管高的孔隙率和大的孔径,且孔结构呈梯度变化,其在气体流量相同的情况下压差明显小于传统粉末冶金烧结多孔管。
Using polyurethane foam as precursor, the water-based slurry was prepared by using gas-atomized Ni-20Cr powder as raw material, and the foam Ni-20Cr alloy filter tube with gradient pore structure was prepared by organic foam impregnation process. The effects of different sintering temperature and filling method on the sintering effect and mechanical properties of foam metal filter tube were investigated. The mechanical properties and gas permeability of foam filter tube after sintering were tested. The results show that the foamed billet can be obtained by the two steps sintering process of low temperature calcination and high temperature sintering. The foam billet has a uniform structure with no holes and the composite interface is well bonded. The compressive yield strength at room temperature is more than 3 MPa, and the yield strength can reach 4.43 MPa with the increase of the amount of slurry. Because of the high porosity and large pore diameter of the foam alloy filter tube, the pore structure changes with the gradient. Under the same situation, the pressure difference is obviously smaller than that of the traditional powder metallurgy sintered porous tube.