年間 4 号発行
ISSN 印刷: 2572-4258
ISSN オンライン: 2572-4266
Indexed in
MECHANICAL PROPERTIES OF Si3N4-BASED COMPOSITE CERAMICS WITH NANOSIZED POROSITY
要約
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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