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Aluminium oxide (Al22O3)-few layer graphene (FLG) reinforced aluminium hybrid composites

Kaykılarlı Cantekin, Altınışık Zehra, Kılıç E. Can, Uzunsoy Deniz, Yeprem H. Aygül

Composites Theory and Practice

2022

R. 22, nr 2

72--78

The present study investigates the microstructural and mechanical properties of few layer graphene (FLG, 0.1 to 5 wt.%) and aluminium oxide (Al22O3, 4 to 20 wt.%) reinforced Al6061 matrix composites prepared via mechanical alloying (MA), uniaxial pressing and pressureless sintering. The effects of the amounts of Al22O3 and FLG were studied. MA was carried out at 300 rpm for 3 h in a planetary ball mill in argon atmosphere. The mechanically alloyed (MAed) powders were compacted via uniaxial pressing (400 MPa) and sintering (620°C, 2 h). The microstructural and mechanical properties of the Al-xAl22O3-yFLG powders and bulk samples were investigated via X-ray diffraction (XRD), light microscopy (LM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), the Archimedes’ method and a hardness test. In the XRD analysis, the aluminium carbide (Al4C3) phase was not detected. The SEM, LM micrographs and EDS results show that the produced composites have a homogeneous structure. Based on the Archimedes’ method, the densification rates of the reinforced samples were higher than the unreinforced sample. The Al22O3-3FLG sample exhibited the highest relative density, 99.25%. According to the hardness measurements, the highest hardness value was 87.28 HV for the Al22O3-1FLG composite and increased twofold compared to Al6061.

Antistatic polyurethane coats with hybrid carbon nanofillers

Kowalczyk K., Kugler S., Spychaj T.

Polimery

2014

T. 59, nr 9

650--655

Thermoplastic coats based on commercial aqueous dispersions of polyurethane and carbon nanofillers (graphite nanoplatelets and/or carbon nanotubes) were prepared and analyzed. The surface resistivity of the samples was in the range of 106—108 W (<<1 wt part/100 wt parts of dry coat of carbon nanofillers). Incorporation of carbon nanofillers into coating systems improves the hardness and thermal resistance of dry coats whereas their glass transition temperature is unaffected.

Otrzymano, a następnie zbadano zestaw antystatycznych powłok bazujących na dostępnej w handlu wodnej dyspersji poliuretanowej oraz nanonapełniaczach węglowych — grafenie wielowarstwowym i/lub nanorurkach węglowych. Stwierdzono, że w wypadku zawartości nanonapełniacza węglowego poniżej 1 % mas. rezystywność powierzchniowa powłok wynosi 106—108Ω, zwiększają się twardość i odporność termiczna, natomiast nie zmienia się w istotnym stopniu temperatura zeszklenia matrycy poliuretanowej.