以α-甲基丙烯酸（MA）、甲基丙烯酸缩水甘油酯（GMA）、丙烯酸丁酯（BA）为单体，接枝改性聚乙二醇（PEG），得到PEG功能化产物（PEG-X），用其湿法处理17-4PH不锈钢粉末，结合聚甲醛/聚丙烯/高密度聚乙烯（POM/PP/HDPE）黏合剂制备粉末注射成型喂料，经注射、脱脂、烧结得到17-4PH烧结样品。讨论了PEG-X对17-4PH不锈钢粉末注射成型喂料和烧结样品性能的影响。结果表明：黏结剂与17-4PH不锈钢粉末的相容性被改善，两者的表面张力下降，浸润性变佳，与POM接触角从116°下降到55°，其中PEG-BA处理效果最佳；喂料流变性能、注射胚力学性能均被改善；经PEG功能化处理的粉末烧结样品晶粒细化，力学性能改善。PEG-MA处理的粉末烧结样品拉伸强度从768 MPa提高到982 MPa，PEG-GMA处理的粉末烧结样品断裂伸长率从10.25%提高到15.90%。

The α-methacrylic acid (MA), glycidyl methacrylate (GMA), butyl acrylate (BA) were selected as monomers to graft polyethylene glycol (PEG) and forming functionalized products (PEG-X), and the 17-4PH stainless steel powder was wet deal with PEG-X. Then, the injection molding feedstock was prepared via combining 17-4PH stainless steel powder dealt by PEG-X functionalized products and polyformaldehyde/polypropylene/high density polyethylene (POM/PP/HDPE). Finally, 17-4PH sintered samples were obtained by injection, degreasing and sintering. The effects of PEG-X functionalized products on 17-4PH stainless steel powder injection molding feedstock and sintered samples were discussed. The results showed that the compatibility between binder and 17-4PH stainless steel powder was improved and corresponding surface tension was decreased, then the wettability between binder and 17-4PH was improved. Finally, the 17-4PH stainless steel powder modified by PEG-BA sample presents the best compatibility, whose contact angle with POM decreased from 116° to 55°. The rheological properties of the feedstock and the mechanical properties of injected green-sample were improved simultaneously. The grain size of the sintered sample dealt with PEG-X was refined and the corresponding mechanical properties were improved. The tensile strength of the PEG-MA powder sintered sample was increased from 768 MPa to 982 MPa, and the elongation at break of the PEG-GMA powder sintered sample was increased from 10.25% to 15.90%.