Influence of glass carbon on thermal and mechanical properties of regenerative epoxy composites
Zbigniew Pawelec, Jarosław Molenda, Marek Wolszczak
Quarterly No. 2, 2010 pages 110-114
DOI:
keywords: glassy carbon, metal-polymer composite, tribological characteristic, thermal properties
abstract The main reason for loss exploitation properties of machine construction elements are surface damages of cooperative moving parts. One of the basic methods for protraction of a machine’s life cycle is regeneration of slide bearings surface damage. It could be done by application of polymeric composite materials (PCMs) instead of a classical regeneration method. PCMs characterize by a low friction coefficient and a high wearing resistance. On account of a work specification of these materials optimization of theirs thermal and mechanical properties is necessary. In the article investigation results concerning on influence of the glassy carbon on regenerative metal-polymer composites were presented. Composite materials containing the glassy carbon in the mass fraction from 5 to 30 parts by weight were investigated. For formulated composite materials mechanical properties like the Brinell hardness test, the Charpy impact strength and a resistance to compression and separation were determined. With use of the Differential Scanning Calorimetry (DSC) thermal effects associated with processes proceeding during a sample heating were studied and the coefficient of thermal linear expansion by dilatometer was determined. Tribological characteristics of metal-polymer composite - bronze combination were measured using the block-on ring tester. On the basis of the obtained results it was confirmed the presence of the glassy carbon in metal-polymer composites stabilize theirs thermal transformation in a elevated temperature and limit theirs coefficient of thermal linear expansion. Presence of the tested filler in the polymer composition to 20% m/m has a good influence on the mechanical properties of the characterized material. Higher hardness, impact strength and lower wearing of the obtained material was observed.