4.7 Article

Effect of H3PO4 content and processing temperature on the structure and mechanical properties of porous Si3N4

期刊

CERAMICS INTERNATIONAL
卷 49, 期 23, 页码 37174-37186

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ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2023.09.041

关键词

a) Porous silicon nitride; b) Phosphoric acid; c) Pore morphology; d) Nanopores; f) Mechanical properties

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Open-porous silicon nitride ceramics were successfully fabricated via low-temperature processing using phosphoric acid as a binder and pore-forming agent. The detailed analysis showed that samples with a phosphoric acid content of 40% exhibited the best mechanical properties.
Open-porous silicon nitride ceramics have been fabricated via low-temperature processing at 1200 degrees C using phosphoric acid as an inorganic binder and pore-forming agent. A detailed study of the effect of phosphoric acid content on the microstructure development and an in-depth analysis of the influence of the porosity and pore morphology on compressive strength, flexural strength, and notch-root radius corrected fracture toughness has been performed. Further, the progressive evolution of porosity and the amount and type of crystalline phases as a function of processing temperature were studied by intermittent XRD analysis. For the first time, a detailed analysis of the pore structure evolution on the longitudinal elastic constant of the porous samples was studied using a non-destructive ultrasonic technique. The critical H3PO4 content of 40 vol% yielded a homogeneous nanoporous structure that resulted in the best mechanical properties - compressive strength >120 MPa, flexural strength >70 MPa, and a notch-root radius corrected K-IC similar to 1 MPa m(1/2). Despite the low fabrication temperature and economic processing route, the mechanical properties of the fabricated porous samples are comparable to the values for porous Si3N4 reported in the literature.

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