Binder jetting additive manufacturing (BJAM) is a widely studied technique fabricating metal parts. In this study, bimodal 316L stainless steel powder mixture of coarse (D50 – 34.1μm) and fine (D50 – 6.28μm) powders were designed for BJAM. Infiltration was used to improve the density of BJAMed parts. Bimodal powder mixture showed clear advantage over unimodal powder system on density and mechanical property of BJAMed parts. Upon solid-phase sintering, BJAMed 316 stainless steel of bimodal powder mixture (9:1 mass ratio of coarse to fine powder) showed relative density 97.19% and tensile strength 343.62 MPa, as compared with relative density 84.55% and tensile strength 291.59 MPa for pure coarse powder. For the same bimodal powder mixture, bronze infiltration, compared with solid-phase sintering, resulted in noticeably higher relative density 99.92% and tensile strength 621.63 MPa. Compared with solid-phase sintering, infiltration significantly reduced the volumetric shrinkage.
CornieJ, BrancazioD, WilliamsP, . Three dimensional printing: rapid tooling and prototypes directly from a CAD model. J. Eng Indus. 1992;114(4):481–488. doi:10.1016/S0007-8506(07)61035-X.
ZiaeeM, CraneNB.Binder jetting: a review of process, materials, and methods. Addit Manuf. 2019;28:781–801.
4.
UtelaB, StortiD, AndersonR, . A review of process development steps for new material systems in three dimensional printing (3DP). J Manuf Process. 2008;10(2):96–104.
5.
MostafaeiA, ElliottAM, BarnesJE, . Binder jet 3D printing—process parameters, materials, properties, modeling, and challenges. Prog Mater Sci. 2021;119:100707–100844.
6.
MostafaeiA, StevenEL, FerenceJJ, . Binder jetting of a complex-shaped metal partial denture framework. Addit Manuf. 2018;21:63–68.
7.
GilmerDB, HanL, LehmannML, . Additive manufacturing of strong silica sand structures enabled by polyethyleneimine binder. Nat Commun. 2021;12(1):5144–5151.
8.
MiyanajiH, MomenzadehN, YangL.Effect of powder characteristics on parts fabricated via binder jetting process. Rapid Prototyp J. 2019;25(2):332–342.
9.
BaiY, WilliamsCB.An exploration of binder jetting of copper. Rapid Prototyp J. 2015;21(2):177–185.
10.
StevenM, EmanuelM, Mich AeCL. Metal parts generation by three dimensional printing, 1992.
11.
AllenSM, SachsEM.Three-dimensional printing of metal parts for tooling and other applications. Met Mater. 2000;6(6):589–594.
12.
CorderoZC, SiddelDH, PeterWH, . Strengthening of ferrous binder jet 3D printed components through bronze infiltration. Addit Manuf. 2017;15:87–92.
13.
LuSL, MeenashisundaramGK, WangP, . The combined influence of elevated pre-sintering and subsequent bronze infiltration on the microstructures and mechanical properties of 420 stainless steel additively manufactured via binder jet printing. Addit Manuf. 2020;34:101266–101275.
14.
LiM, DuWC, ElwanyA, . Metal binder jetting additive manufacturing: a literature review literature review. J Manuf Sci E-T ASME. 2020;142(9):90801–90845.
15.
DerbyB.Inkjet printing of functional and structural materials: fluid property requirements, feature stability, and resolution. Annu Rev Mater Res. 2010;40(1):395–414.
16.
PichaK, SpackmanC, SamuelJ.Droplet spreading characteristics observed during 3D printing of aligned fiber-reinforced soft composites. Addit Manuf. 2016;12:121–131.
17.
DesmondKW, WeeksER.Influence of particle size distribution on random close packing of spheres. Phys Rev E Stat Nonlin Soft Matter Phys. 2014;90(2):022204.
McGearyRK.Mechanical packing of spherical particles. J Am Ceram Soc. 1961;44(10):513–522.
20.
DoT, KwonP, ShinCS.Process development toward full-density stainless steel parts with binder jetting printing. Int J Mach Tools Manuf. 2017;121:50–60.
21.
BaiY, WagnerG, WilliamsCB.Effect of particle size distribution on powder packing and sintering in binder jetting additive manufacturing of metals. J Manuf Sci E-T ASME. 2017;139(8):81019–81024.
22.
GodlinskiD, MorvanS.Steel parts with tailored material gradients by 3D-printing using nano-particulate ink. Mater Sci Forum. 2005;492-493-493:679–684.
23.
CoeHG, PasebaniS.Use of bimodal particle size distribution in selective laser melting of 316L stainless steel. J. Manufact Mater Proc. 2020;4(1):8–23.
24.
EnnetiRK, ProughKC.Effect of binder saturation and powder layer thickness on the green strength of the binder jet 3D printing (BJ3DP) WC-12%Co powders. Int J Refract Met Hard Mater. 2019;84:104991–104996.
25.
HolmanRK, CimaMJ, UhlandSA, . Spreading and infiltration of inkjet-printed polymer solution droplets on a porous substrate. J Colloid Interface Sci. 2002;249(2):432–440.
26.
LiZ, HeB, GuoQ.Strengthening and hardening mechanisms of additively manufactured stainless steels: the role of cell sizes. Scr Mater. 2020;177:17–21.
27.
LiuL, DingQ, ZhongY, . Dislocation network in additive manufactured steel breaks strength–ductility trade-off. Mater Today. 2018;21(4):354–361.
28.
SemlakKA, SpencerCW, RhinesFN.Rate of capillary rise of liquid metal in a higher melting metal powder compact. JOM. 1957;9:63–64.
