1998 / Solid Freeform Fabrication Proceedings
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Author Guohua Wu, Noshir Langrana, Sriram Rangarajan, Rajendra Sadangi, Ahmad Safari, Stephen C. Danforth, Rutgers, The State University of New Jersey
Source Solid Freeform Fabrication Proceedings, 1998, pp 479-486
Abstract 17-4 PH stainless steel is known to provide an attractive combination of high strength and corrosion resistance. In this research, the feasibility of SFF fabrication of high density parts using 17-4 PH powder is examined. A part can be fabricated using both indirect and direct methods. The indirect method includes making a negative RTV mold, making compounded material using ECG binder and stearic acid with the metal powder, and pouring the compounded material to get a green part. This is followed by binder bum out (BBO) and sintering cycles. The direct method uses Fused Deposition of Metals (FDMet). In FDMet, the 17-4PH powder is compounded with a FD binder and extruded into filaments, followed by part building, BBO and sintering. The initial results of the indirect method of fabrication produced 9l% theoretical density of 17-4PH parts with Vickers hardness of 223. Keywords: Rapid Prototyping RTV mold, 17-4PH, FDMet, Binder Burning Out (BBO), Sintering (Auth abstract) [References: 5]
Solid Freeform Fabrication Proceedings can be obtained from: The Solid Freeform Fabrication Symposium
or contact:
The University of Texas at Austin
Laboratory for Freeform Fabrication / Texas Materials Institute
Mechanical Engineering Dept.
c/o The Solid Freeform Fabrication Symposium
MC C2200
Austin, TX 78712-1063 USA
512-471-3026; 512-471-7681 FX; Email: sffsymp@uts.cc.utexas.edu