多孔蒙乃尔合金的制备及其结构特性

Preparation and Structure Characteristics of Porous Monel Alloy

以蒙乃尔粉为原料,以K2CO3为造孔剂,采用烧结-溶解法制备了不同孔隙率的蒙乃尔合金多孔试样。研究了造孔剂体积分数、压坯压力和烧结温度对试样孔隙率、孔径和透气度的影响。结果表明,当造孔剂的体积分数在20%~40%之间时,制备的样品孔隙率为31%~46%。当压坯压力在200~400 MPa范围时,随压力的增大试样的孔隙率、孔径和透气度均减小;当烧结温度在850~1000℃范围时,随烧结温度升高,孔径和透气度先增大后缓慢降低,在950℃达到峰值。当造孔剂体积分数为30%,压制压力为200MPa,烧结温度950℃时,所制备的蒙乃尔多孔材料孔隙率为37%,最大孔径为21.5μm,透气度为76.77 m^3/(h·k Pa·m^2)。

In order to prepare Monel alloy porous filtration material,the porous Monel samples with different porosity were fabricated by a sintering-dissolution process using Monel powder as raw material and K2CO3 as a space holder.The influence of space holder,compacting pressure and sintering temperature on the porosity,cell size and permeability of samples was investigated.The results show that the porosity of samples is in range of 31%~46%,when the volume fraction of the space holder is between 20 vol%and 40 vol%.While compacting pressure in the range of 200~400 MPa,the porosity,cell size and permeability of samples decrease with compacting pressure increasing;while sintering temperature in the range of 850~1000℃,the cell size and permeability increase first,then slowly decrease with the sintering temperature increasing,and the peak values are at 950℃.While the volume fraction of space holder is 30%,compacting pressure is 200 MPa,sintering temperature is 950℃,the porosity,maximum cell size and permeability of the porous Monel sample are 37%,21.5μm,76.77 m^3/(h·kPa·m^2),respectively.