Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.22/4282
Título: TiB2 nanostructured coating for GFRP injection moulds
Autor: Martinho, R. P.
Silva, Francisco J. G.
Alexandre, R. J. D.
Baptista, A. P. M.
Palavras-chave: Hard coatings
Micro-abrasion
Nanoindentation
Thin films
Wear
Data: 2011
Editora: American Scientific Publishers
Relatório da Série N.º: Journal of Nanoscience and Nanotechnology; Vol. 11, Issue 6
Resumo: In the injection moulding of polypropylene reinforced with hard glass fibres, die materials are commonly subjected to severe abrasive wear. In order to improve its wear resistance, an unbalanced magnetron sputtering PVD compositional monolayered coating has been produced. The film was composed by a nanostructured TiB2 monolayer. Microstructure characterization and thickness evaluation were conducted by scanning electron microscopy (SEM). Film topography and roughness were accessed by SEM and Atomic Force Microscopy (AFM). The phase analyse was investigated by X-ray diffraction (XRD), using Cu Kalpha radiation. Scratch tests were conducted in order to study the film adhesion to the substrate. Load-Displacement curves (nanoindentation analysis) allowed measuring the film hardness and Young's modulus. A ball-cratering tribometer was used to determine the micro-abrasion laboratorial wear resistance, under different tests conditions, using SiC particles in distilled water slurry. At the end of these tests, the worn surfaces were analyzed by SEM and Energy Dispersive X-ray Spectroscopy (EDS) in order to compare these results with some other coatings already tested in the same conditions. To test the practical wear resistance, 135000 injection cycles were done in a plastic injection industrial mould. Coated samples were put on the plastic feed canal, after a turbulent zone. In these tests, a 30% (wt) glass fibres reinforced polypropylene was used. Worn sample surfaces were analyzed by SEM after 45.000 and 90.000 cycles. Image analyses were made in order to evaluate the damage increases and to observe the wear mechanisms involved.
Peer review: yes
URI: http://hdl.handle.net/10400.22/4282
ISSN: 1533-4880
1533-4899
Versão do Editor: http://www.ingentaconnect.com/content/asp/jnn/2011/00000011/00000006/art00102?token=00491eb711b46372a8f2de383a4b3b2570747b5f5f4138767c4b664c2a72752d7b08e1921
Aparece nas colecções:ISEP – CIDEM – Artigos

Ficheiros deste registo:
Ficheiro Descrição TamanhoFormato 
ART_RMartinho_2011_CIDEM.pdf95,84 kBAdobe PDFVer/Abrir


FacebookTwitterDeliciousLinkedInDiggGoogle BookmarksMySpace
Formato BibTex MendeleyEndnote Degois 

Todos os registos no repositório estão protegidos por leis de copyright, com todos os direitos reservados.