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71. Homogeneity, anisotropy, and texture in Si3N4 ceramics made by fused deposition

Author Rangarajan, S. Pozsgai, I. McIntosh, J. McCuiston, R. Harper, B L. Langrana, N. Safari, A. Danforth, S C. Clancy, R B. Gasdaska, C. Whalen, P J. Institution Rutgers Univ, Piscataway, NJ, USA

Source Materials Research Society Symposium Proceedings. v 542 1999. p 97-103. Conference Information Proceedings of the 1998 MRS Fall Meeting - Symposium V, 'Solid Freeform and Additive Fabrication'. Boston, MA, USA. 19981130-19981203.

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 ( sigma f 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 beta -seed particles has also been made. (Auth abstract) [References: 11] XX





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