Abstract
Porous silicon nitride is a promising material for many advanced applications due to its many outstanding properties. In this work, porous silicon nitride was fabricated at 1200 °C using a mixture of silicon nitride powder and phosphoric acid. The dual role of phosphoric acid as inorganic binder and pore former has been critically analyzed through a detailed structural characterization. Elastic constants of the porous silicon nitride samples were determined using non-destructive ultrasound phase spectroscopy, and the influence of the phosphoric acid content on the elastic properties was studied at depth. Both longitudinal and shear elastic constants were determined and Young's modulus and Poisson's ratio were calculated as a function of porosity considering the actual elastic symmetry of the fabricated samples. The experimentally determined elastic constants were compared with the predictions from different analytical models to understand the influence of porosity and pore morphology on the stiffness of the fabricated samples.
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