金属注射成形水气联合雾化316不锈钢性能的研究

通过对水雾化、水气联合雾化和气雾化316不锈钢粉末喂料的流动性及其烧结性能进行研究,探讨了水气联合雾化粉末用于粉末注射成形的可行性.结果表明,水气联合雾化粉末颗粒呈近球形,以此制备的喂料粘度低,熔体流动速率达1108.5g/10min.在1365℃保温3h的条件下,水气联合雾化316不锈钢粉末样品的致密度达到98.13%,抗拉强度达505 MPa、屈服强度达193MPa、伸长率达55%、硬度为78HRB,超过美国MPIF对316L不锈钢MIM制品的相应标准,优于传统水雾化粉末的烧结性能.水气联合雾化316不锈钢粉末适合用于MIM的批量生产.

Properties of injection molded and sintered water-gas joint atomized 316L stainless steel powder

The flow properties, sintering densification and mechanical properties of water atomized,water-gas joint atomized and gas atomized 316L stainless steel powder were discussed. The feasibility of water-gas joint atomized powder used in powder injection molding was also studied. The results show that the MFI (melting flow index) of water-gas joint atomized powder can be reached up to 1108.5 g/10 min. The sintering experiment results indicate that the sintering activity of water-gas joint atomized powder is much higher than conventional water atomized powder. The sintered density, tensile strength, yield strength, elongation and hardness of the water-gas joint atomized powder attained at 98.13 %, 505 MPa,193 MPa, 55% and HRB78, respectively, the values of which are also superior to the MPIF standard. Taking into account the properties and cost comprehensively, water-gas joint atomized 316 stainless steel powder can be widely used in the practical production of the metal injection molding.