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2 Open Chemistry

2 2014

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Optical emission spectra analysis of thermal plasma treatment of poly(vinyl chloride)

100%

Fazekas P. , Keszler A. M. , Bódis E. , Drotár E. , Klébert S. , Károly Z. , Szépvölgyi J.

Open Chemistry

2015

tom 13

nr 1

Decomposition of poly(vinyl chloride) (PVC) was investigated in radiofrequency thermal plasma in neutral, oxidative and reductive conditions. Optical emission spectroscopy (OES) was applied for the characterization of the plasma column. OES was used to identify active plasma components such as excited atoms, ions, radicals and molecules. The spectra were dominated by molecular C2, CN, OH, and CH bands, and atomic H, Ar, C, Cl and O lines. Emission intensities of main species were monitored versus various experimental parameters. The rotational-vibrational temperatures determined from different bimolecular species were considered in the range of 2000–6400 K. Solid soot samples were collected and purified to investigate the possibility of graphene formation as a by-product of the decomposition process.

Spark plasma sintering of Si3N4/multilayer graphene composites

84%

Bódis E. , Tapasztó O. , Károly Z. , Fazekas P. , Klébert S. , Keszler A. M. , Balázsi K. , Szépvölgyi J.

Open Chemistry

2015

tom 13

nr 1

Mulitlayer graphene reinforced silicon nitride composites were prepared by spark plasma sintering to investigate the effect of the graphene addition on mechanical properties. The composites contained multilayer graphene (MLG) in various (0, 1, 3 and 5 wt%) content. Significantly higher fracture toughness of 8.0 MPa m1/2 was obtained at 1% MLG content, however, on further increasing the graphene content the toughness did not increase, but dropped to the value of the monolithic silicon nitride. The maximum hardness of 18.8 MPa was also obtained at 1% MLG, while at higher MLG contents it gradually decreased.