不同粒度粉末注射成形试样的烧结性能  

Sinter behavior of injection molding compacts made of different particle size powders

作　　者：汤潇[1] 李益民[1] 李流军[1] 

机构地区：[1]中南大学粉末冶金国家重点实验室,长沙410083

出　　处：《粉末冶金材料科学与工程》2006年第6期354-358,共5页Materials Science and Engineering of Powder Metallurgy

基　　金：国家863计划资助项目(2001AA337050);霍英东基金资助项目(81041);全国优秀博士论文资助项目(200135)

摘　　要：对平均粒径为65.71μm和9.57μm的316L不锈钢水雾化粉及其混合粉末进行注射成形,探讨在粗粉末中加入细粉末对混合粉末的烧结致密化过程和力学性能的影响。结果表明,在粗粉末中加入25%(质量分数)的细粉末,可以提高粗粉末的烧结活性;烧结样密度达到理论密度的95%,抗拉强度达498 MPa,屈服强度达192MPa,伸长率为52%,硬度为HRB 60,即在粉末成本增加不多的基础上,力学性能大大超过了单一粗粉末烧结样,基本达到了美国MPIF关于316不锈钢注射成形烧结件的性能标准,为316L不锈钢粉末注射成形较大尺寸件提供了一条可行途径。The injection molding 316L stainless steel powders with average particle size of 65.71μm and 9.57μm respectively were prepared by water-atomization, and the injection molding 316L stainless steel compacts were also prepared using a mixture of the above powders. The effect of adding fine particle powder to coarse particle powder on sintering densification process and mechanical properties of the mixing powder was also discussed. It is shown that the sintering activity of coarse particle is improved by adding fine particle of 25 % in mass, which leads to that the sintered density, yield strength, tensile strength, elongation and hardness of the mixed powder compacts arrive at 95%, 192 MPa, 498 MPa, 59% and HRB60 respectively. Except for a slightly increase in powder cost by the addition of fine particle, it is obviously that the mechanical properties of the compact with addition of fine particle is superior to those of the compact only prepared by coarse particle, which are also similar to the MPIF standard. After this investigation, a feasible way is provided for the preparation of MIM 316L stainless steel parts with large dimension.

关 键 词：金属注射成形 粗粉末 316L不锈钢 强化烧结 力学性能 

分 类 号：TF122.1[冶金工程—粉末冶金] TF124.52[冶金工程—冶金物理化学]