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Homogeneity, Anisotropy, and Texture In Si3n4 Ceramics made by Fused Deposition

Published online by Cambridge University Press:  10 February 2011

S. Rangarajan ,
I. Pozsgai ,
J. McIntosh ,
R. McCuiston ,
B. L. Harper ,
N. Langrana ,
A. Safari ,
S. C. Danforth ,
R. B. Clancy  and
C. Gasdaska
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S. Rangarajan
Affiliation:
Rutgers University, Piscataway, NJ;
I. Pozsgai
Affiliation:
Rutgers University, Piscataway, NJ;
J. McIntosh
Affiliation:
Rutgers University, Piscataway, NJ;
R. McCuiston
Affiliation:
Rutgers University, Piscataway, NJ;
B. L. Harper
Affiliation:
Rutgers University, Piscataway, NJ;
N. Langrana
Affiliation:
Rutgers University, Piscataway, NJ;
A. Safari
Affiliation:
Rutgers University, Piscataway, NJ;
S. C. Danforth
Affiliation:
Rutgers University, Piscataway, NJ;
R. B. Clancy
Affiliation:
Allied Signal Research and Technology, Morristown, NJ
C. Gasdaska
Affiliation:
Allied Signal Research and Technology, Morristown, NJ
P. J. Whalen
Affiliation:
Allied Signal Research and Technology, Morristown, NJ
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Abstract

The Fused Deposition of Ceramics (FDC) process is an extrusion based layered manufacturing technique. In this study, the microstructural and property homogeneity of GS44-Si3N4 parts made by FDC is examined. The feedstock, green, and sintered parts were examined using characterization techniques such as optical and scanning electron microscopy, x-ray radiography, and x-ray diffraction. In addition, mechanical properties (σf, and Klc), shrinkage, and warpage results were used to characterize the FDC parts. It was found that by using proper build parameters and tool paths, dense, homogenous, near-net-shape GS44-Si3N4 parts can be fabricated. While the mechanical properties of these parts are shown to be isotropic, there is some degree of texturing detected with XRD. Si3N4 filament feedstock intentionally textured with 5.5 vol% of β-seed particles has also been made.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 542: Symposium V – Solid Freeform and Additive Fabrication , 1998 , 97
Copyright
Copyright © Materials Research Society 1999

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