前驱体制备对三维通孔不锈钢泡沫性能的影响

Effects of precursor preparation on performances of stainless steel foam with 3-D open cells network structure

研究前驱体中浆料浸入量与不锈钢粉末粒径对具有三维通孔网状结构不锈钢泡沫制品的开孔率和抗弯强度的影响。研究发现:随前驱体中浆料浸入量的增加,泡沫制品的抗弯强度逐渐提高,开孔率有所降低;而随着粉末粒径的减小,泡沫制品的抗弯强度显著增大,其开孔率呈轻微降低的趋势。当将44μm的316L不锈钢粉末与添加剂配成料浆浸入20ppi的聚氨酯海绵中,制成浸入量0.5 g/cm3的前驱体,然后在(1 260±2)℃时烧结30 min,可制得孔径大小为1mm左右、具有良好三维通孔结构的不锈钢泡沫,该泡沫的开孔率为81.2%,抗弯强度为51.72 MPa。

The effects of the slurry loading and particle size of the stainless steel powder in the precursor on the open porosity and bending strength of stainless steel foams （SSFs） with 3-D open cells networks structure were investigated. The results show that the SSFs＇ bending strength gradually increases and the open porosity falls with increasing the slurry loading in precursor; the bending strength remarkably improves and the open porosity reduces little by little with the particle size of stainless steel powder minishing. The 316L stainless steel powder and the additive sol are mixed to make slurry, subsequently the slurry is immerged into the sponge to obtain the precursor, in which the slurry loading is 0.5 g/cm^3, and then the precursor is sintered at the temperature of （1 260±2） ℃ for 30 rain, a stainless steel foam can be obtained, which has good 3-D open cells network structure, aperture of about 1mm, open porosity of 81.2% and bending strength of 51.72 MPa.