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Nanoscience and Technology: An International Journal
ESCI SJR: 0.228 SNIP: 0.484 CiteScore™: 0.37

ISSN Imprimir: 2572-4258
ISSN On-line: 2572-4266

Nanoscience and Technology: An International Journal

Anteriormente Conhecido Como Nanomechanics Science and Technology: An International Journal

DOI: 10.1615/NanoSciTechnolIntJ.v8.i4.50
pages 347-357

MECHANICAL PROPERTIES OF Si3N4-BASED COMPOSITE CERAMICS WITH NANOSIZED POROSITY

Sergey A. Lurie
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradsky Ave., Moscow, 125040, Russia; Dorodnicyn Computing Centre FIC IU of the Russian Academy of Sciences, 40 Vavilov Str., Moscow, 119333, Russia
Lev N. Rabinskiy
Moscow Aviation Institute (National Research University), 4 Volokolamskoe Highway, Moscow, 125993, Russia
P. O. Polyakov
Moscow Aviation Institute, 4 Volokolamskoe Highway, Moscow, 125933, Russia
S. A. Sitnikov
Moscow Aviation Institute, 4 Volokolamskoe Highway, Moscow, 125933, Russia
Yury Solyaev
Institute of Applied Mechanics, Russian Academy of Sciences, 7 Leningradskii Ave., Moscow, 125040, Russia; Moscow Aviation Institute, 4 Volokolamskoe Highway, Moscow, 125933, Russia

RESUMO

The paper presents the results of experimental and theoretical investigation of the mechanical properties of composite ceramics based on silicon nitride, reinforced with silicon carbide fibers. Composite ceramics samples reinforced with unidirectional fibers with a volume content of 10% were obtained using the 3D printing technology and manual lay-up method. The ceramic matrix contains up to 30% of porosity, and the average pore size is less than 1 μm. Flexural strength and the Young modulus of the pure and reinforced ceramics were determined in three-point bending tests. The results of experimental studies are compared with those of modeling. FE simulation of a porous matrix is performed based on realistic representative fragments generated using an overlapped solid grains model. Evaluation of the influence of fibers on the properties of unidirectional samples is performed on the basis of a simple slab model with regard to the porous matrix effective properties found in numerical simulations. It is shown that the experimental results for the effective elastic modulus of the composites agree well with the calculation results, but the strength of the experimental samples is 30% lower than that calculated.


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