粉末注射成形制备Si<sub>3</sub>N<sub>4</sub>颗粒增强316L不锈钢

粉末注射成形制备Si₃N₄颗粒增强316L不锈钢

摘要: 以多组元水溶性黏结剂为黏结剂,采用粉末注射成形工艺成功制备出了Si₃N₄颗粒增强316L不锈钢复合材料.研究表明:以聚乙二醇(PEG)、聚乙烯醇缩丁醛(PVB)和硬脂酸(SA)为主要成分的水溶性黏结剂表现出较好的水溶脱脂性能,注射坯在蒸馏水中脱脂6 h后,黏结剂总脱除率约为55%,其中PEG的脱除率约为78.6%;复合材料经烧结后组织均匀致密,性能良好,其致密度、硬度和拉伸强度分别为97.5%、HRB 81.7和620 MPa,其硬度和拉伸强度分别比采用石蜡基黏结剂制备的PIM-Si₃N₄增强316L不锈钢复合材料提高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.