粉末注射成形制備Si<sub>3</sub>N<sub>4</sub>顆粒增強316L不銹鋼

粉末注射成形制備Si₃N₄顆粒增強316L不銹鋼

摘要: 以多組元水溶性黏結劑為黏結劑,采用粉末注射成形工藝成功制備出了Si₃N₄顆粒增強316L不銹鋼復合材料.研究表明:以聚乙二醇(PEG)、聚乙烯醇縮丁醛(PVB)和硬脂酸(SA)為主要成分的水溶性黏結劑表現出較好的水溶脫脂性能,注射坯在蒸餾水中脫脂6 h后,黏結劑總脫除率約為55%,其中PEG的脫除率約為78.6%;復合材料經燒結后組織均勻致密,性能良好,其致密度、硬度和拉伸強度分別為97.5%、HRB 81.7和620 MPa,其硬度和拉伸強度分別比采用石蠟基黏結劑制備的PIM-Si₃N₄增強316L不銹鋼復合材料提高5%和20.4%.

Abstract: Si₃N₄ particle-reinforced 316L stainless steel composites were prepared by powder injection molding(PIM) using water-soluble binders.It is shown that a water-soluble binder mainly consisting of polyoxymethylene(PEG),polyvinyl butyral(PVB) and stearic acid(SA) exhibits a better water-soluble degreasing performance.After degreasing injection parts in water for 6 h,the total binder removal rate is 55% and the PEG removal rate is 78.6%.The sintered composites have a uniform microstructure and excellent properties with a relative density of 95.2%,a hardness of HRB 79.8 and a tensile strength of 620 MPa.And the hardness and tensile strength are 5% and 20.4% higher than the Si₃N₄ particle-reinforced 316L stainless steel produced by PIM with a paraffin wax-based binder,respectively.