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This work was financed from the funds of the Ministry of Education and Science by Agreement No. DNK/SP/513880/2021 of 22 December 2021, the project “14th School of Machining and the 43rd Scientific School of Abrasive Machining”, under the programme “Perfect Science”.
The purpose of this study is to investigate the impact of the introduction of powder modifier into composite re-
inforced with carbon fabric on selected mechanical properties. The tests were performed on 16 groups of hybrid
epoxy composites, including one reference group and 15 groups containing alumina with the grain size of F220,
F240, F280, F320 and F360, added in the weight percent of 5%, 10% and 15%. This composite was made of
certified components designed for application in the aviation industry. Test results indicated that the increase of
alumina content by weight caused thea decrease of strength of polymer composites in most tests. The value of the
force transferred by the composite in the tensile test increased disproportionately to the cross section. It resulted
in decreased strength. The addition of alumina impeded the super-saturation of the carbon fabric, which caused
discontinuities in the matrix material.