Mechanical behavior of the layered ceramic composite ZrB₂-ZrO₂-SiC | Izvestiya vuzov. Fizika. 2019. № 8. DOI: 10.17223/00213411/62/8/121

Mechanical behavior of the layered ceramic composite ZrB₂-ZrO₂-SiC

Deformation properties and features of heat-protecting ZrB₂ - 20% SiC composite and heat-protecting multilayered ZrO₂-doped (from 0% to 100%) ZrB₂ - 20 % SiC composite were studied under three-point bending and diametral compression. Increase of ZrB₂ concentration lead to significant decrease of Eus and rise of linear thermal expansion coefficient. In case of the multilayered composite, the formation of elongating residual strains was observed in interphase regions from the side bordering the layer with lower thermal expansion coefficient. At the same time, from the side bordering the layer with higher α the formation of compressive residual strains was found. The strength in areas with compressive residual strains was twice larger than one in areas with elongating residual strains. Relief of samples scabs witnesses that irrespective of the deformation conditions during the three-point bending, bifurcation of the main crack took place in the interphase of the layers with the largest difference in thermal expansion coefficients (with ZrO₂ concentration of 30% and 70%). Energy of ZrB₂-SiC-ZrO₂ multilayered ceramic composite fracture significantly overtopped one for ZrB₂ - 20% SiC.

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Keywords

слоистый керамический теплозащитный композит, разрушение, растягивающие и сжимающие остаточные напряжения, layered ceramic thermal-protective composite, destruction, tensile and compressive residual stresses

Authors

Name	Organization	E-mail
Burlachenko A.G.	Institute of Strength Physics and Materials Science of SB RAS	aleksburlachenko@rambler.ru
Mirovoy Yu.A.	Institute of Strength Physics and Materials Science of SB RAS; National Research Tomsk Polytechnic University	y.a.mirovoy@gmail.com
Dedova E.S.	Institute of Strength Physics and Materials Science of SB RAS; National Research Tomsk Polytechnic University	lsdedova@yandex.ru
Buyakova S.P.	Institute of Strength Physics and Materials Science of SB RAS; National Research Tomsk Polytechnic University; National Research Tomsk State University	sbuyakova@ispms.tsc.ru

Всего: 4

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