Microstructural Characterization and Mechanical Properties of Si3N4 Formed by Fused Deposition of Ceramics |
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| Authors: | S Iyer J McIntosh A Bandyopadhyay N Langrana A Safari S C Danforth R B Clancy C Gasdaska P J Whalen |
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| Affiliation: | Corning, Inc., Corning, New York 14831;
Washington State University, Pullman, Washington 99164;
Rutgers University, New Brunswick/Piscataway, NJ 08903;
Honeywell, Morristown, New Jersey 07962;
Whalen Management Group, Sparta, New Jersey |
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| Abstract: | We present processing (green and sintered), part shrinkage and warping, microstructural characterization, and mechanical properties of Si3N4 made by fused deposition of ceramics (FDC), using optical microscopy, scanning electron microscopy, and X-ray diffraction. The mechanical properties (fracture strength, fracture toughness, and Weibull modulus) are also reported. Proper FDC build parameters resulted in dense, homogeneous, near-net-shape Si3N4, with microstructures and mechanical properties similar to conventionally processed material. Mechanical properties are shown to be isotropic, while there is some degree of microstructural texturing (preferred β-Si3N4 grain orientation) in sintered components. |
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