PDF(3351 KB)
Functionalization of PEG and Its Application in Powder Injection Molding of 17-4PH Stainless Steels
LI Xiao-fu, WU Dun, CAO Zheng, CHENG Jun-feng, WANG Dong, LIU Chun-lin
PDF(3351 KB)
PDF(3351 KB)
Functionalization of PEG and Its Application in Powder Injection Molding of 17-4PH Stainless Steels
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%.
Metal powder injection molding / 17-4PH stainless steel / Graft / Surface modification / Mechanical properties
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