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采用树枝状Inconel625合金粉末,用冷等静压法制备了多孔支撑管,研究了烧结工艺对多孔支撑管组织结构和性能的影响。采用粉末湿法喷涂技术成形微孔膜层,研究了喷涂次数和烧结工艺对微孔膜层性能的影响。结果表明,在氢气气氛烧结炉中,烧结温度升高至1240℃时,多孔支撑管的最大孔径、孔隙率和透气系数达到要求,且试样具有合格的力学性能。采用多台阶慢速升温的烧结工艺研制出喷涂2遍后的金属微滤膜管,对于0.3μm的粉尘,过滤效率大于99%,并且具有较高的渗透系数(>200 m3/h·m~2·k Pa)。
Adopting dendritic Inconel625 alloy powder, porous support tube was prepared by cold isostatic pressing method, and the influence of sintering process on the microstructure and properties of porous support tube was studied. The microporous membrane was formed by powder wet spraying technique, and the influence of spraying times and sintering process on the properties of microporous membrane was studied. The results show that the maximum pore size, porosity and air permeability coefficient of the porous support tube meet the requirements when the sintering temperature is increased to 1240 ℃ in the hydrogen atmosphere sintering furnace. And the specimen has qualified mechanical properties. The multi-stage slow temperature sintering process was used to fabricate the metal microfiltration membrane tube after spraying twice. The filtration efficiency was more than 99% for the 0.3μm dust and had a high permeability coefficient (> 200 m3 / h · m ~ 2 · k Pa).