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- W2003458897 abstract "Local mechanical properties, particularly the hardness and Youngs modulus of highly porous silicon nitride based foams were studied in this work. Silicon nitride foams were prepared using polyurethane foam replication method to obtain appropriate cellular structure suitable for bio-application. Two types of the polyurethane foams were used (with average pore size 0.48 mm and 0.62 mm). Some of these samples were prepared by single or multiple infiltrations. The effects of structures, temperature of calcination, volume fraction of Si 3 N 4 powder and number of the infiltrations on the local mechanical properties were investigated. The Youngs modulus of studied samples range from 12 to 46 GPa at the macroscopic scale measured by resonant frequency technique and from 10 to 28 GPa at the microscopic scale measured by instrumented indentation. Results showed increase of the hardness and Youngs modulus with increasing of the calcination temperature, with increasing of the number of infiltrations and also with increasing of volume fraction of Si 3 N 4 powder in suspension. The results obtained from nanoindentation carry out lower values in comparison with the values measured by resonant frequency technique." @default.
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- W2003458897 date "2014-03-01" @default.
- W2003458897 modified "2023-09-27" @default.
- W2003458897 title "Determination of Local Mechanical Properties of Si<sub>3</sub>N<sub>4</sub> Based Foams" @default.
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- W2003458897 doi "https://doi.org/10.4028/www.scientific.net/kem.606.213" @default.
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