Influence of casting procedure on wear of magnesium matrix composites reinforced with carbon open-celled foam

• Autorzy: Godzierz Marcin , Olszówka-Myalska Anita

Warianty tytułu

PL

Wpływ procedury odlewania na zużycie kompozytów magnezowych zbrojonych pianą węglową

• Języki publikacji: EN

Abstrakty

EN

In this article the characteristics of the macrostructure, microstructure (LM, SEM) and selected properties of magnesium matrix composites reinforced with carbon open-celled foam with a porosity of 10 ppi, obtained by two casting techniques - gravity casting and pressure infiltration, were presented. The open porosity and hardness of the composites were determined. Tribological examinations in dry friction conditions were performed by the pin-on-disc method, and the coefficient of friction, weight loss of the sample as well as the cast iron countersample were determined, and the wear trace was characterized. Observations of the examined material surfaces after friction tests were conducted by SEM. In comparison to the gravity cast composite, a lower porosity, higher hardness and finer magnesium matrix size were found for the pressure infiltrated composite. The impact of the casting technique also concerned the tribological properties. Both the composites exhibited a lower coefficient of friction in comparison to pure magnesium, but for the pressure infiltrated composite the coefficient of friction, weight loss of the sample and countersample, as well as the depth of the wear trace were the lowest. Moreover, after the friction tests, different effects were observed on the surfaces. In the gravity cast composite the carbon component cracked and separated from the matrix, in contrast to the pressure infiltrated composite where uniform wear was observed while maintaining continuous bonding with the matrix, which explains the differences in the tribological properties.

PL

Scharakteryzowano makrostrukturę, mikrostrukturę (LM, SEM) i wybrane właściwości kompozytu na osnowie technicznie czystego magnezu zbrojonego otwartokomórkową pianą węglową o porowatości 10 ppi, otrzymanego dwiema metodami - odlewania grawitacyjnego oraz infiltracji ciśnieniowej. Określono porowatość i twardość kompozytów. Przeprowadzono badania tribologiczne w warunkach tarcia na sucho metodą pin-on-disc i wyznaczono współczynnik tarcia, ubytek masy próbki i przeciwpróbki żeliwnej oraz scharakteryzowano ślad wytarcia. Powierzchnie kompozytów po badaniach tribologicznych scharakteryzowano metodą SEM. Wykazano mniejszą porowatość, większą twardość i mniejsze ziarna osnowy magnezowej kompozytu otrzymanego metodą infiltracji ciśnieniowej w porównaniu z odlewnym grawitacyjnie. Wpływ techniki odlewania dotyczył również właściwości tribologicznych. Obydwa kompozyty charakteryzował mniejszy współczynnik tarcia w porównaniu z próbką referencyjną z materiału osnowy, ale dla kompozytu otrzymanego metodą infiltracji ciśnieniowej ten współczynnik, ubytki masy i głębokość śladu wytarcia były najmniejsze. Ponadto obserwowano różnice na powierzchni wytarcia, komponent węglowy ulegał wykruszeniu w przypadku materiału otrzymanego metodą odlewnia grawitacyjnego, a w infiltrowanym ciśnieniowo następowało jego równomierne zużycie przy zachowaniu ciągłego połączenia z osnową, co tłumaczy różne parametry tribologiczne.

Słowa kluczowe

EN

magnesium matrix composite; carbon open-celled foam; pressure infiltration; gravity casting; wear resistance; tribological properties

PL

kompozyty magnezowe; otwartokomórkowe piany węglowe; infiltracja ciśnieniowa; odlewanie grawitacyjne; odporność na zużycie; właściwości tribologiczne

• Wydawca: Polskie Towarzystwo Materiałów Kompozytowych
• Czasopismo: Composites Theory and Practice
• Rocznik: 2019
• Tom: R. 19, nr 2
• Strony: 64--70
• Opis fizyczny: Bibliogr. 31 poz., rys., tab.

Twórcy

autor

Godzierz Marcin

• Silesian University of Technology, Faculty of Materials Science and Metallurgy, Institute of Materials Engineering, ul. Krasińskiego 8, 40-019 Katowice, Poland

autor

Olszówka-Myalska Anita

• Silesian University of Technology, Faculty of Materials Science and Metallurgy, Institute of Materials Engineering, ul. Krasińskiego 8, 40-019 Katowice, Poland

Bibliografia

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Uwagi

Opracowanie rekordu w ramach umowy 509/P-DUN/2018 ze środków MNiSW przeznaczonych na działalność upowszechniającą naukę (2019).