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Spark plasma sintering of Si3N4/multilayer graphene composites

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Bódis E., Tapasztó O., Károly Z., Fazekas P., Klébert S., Keszler A. M., Balázsi K., Szépvölgyi J.
Open Chemistry
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2015
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vol. 13
|
issue 1
EN
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.
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