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Drilling of Carbon Fibre Reinforced Laminates - A Comparative Analysis of Five ...
L.M.P. Durao; D.J.S. Goncalves; J.M.R.S. Tavares; V.H.C. Albuquerque; A.T. Marques; A.P.M. BaptistaThe distinguishing characteristics of carbon fibre reinforced laminates, like low weight, high strength or stiffness, had resulted in an increase of their use during the last decades. Although parts are normally produced to "near-net" shape, machining operations like drilling are still needed. In result of composites non-homogeneity, this operation can lead to delamination, considered the most serious kind of d...
Unstressed PACVD diamond films on steel pre-coated with a composite multilayer
F. J.G. Silva; A. J. S. Fernandes; F. M. Costa; A. P. M. Baptista; E. PereiraAlthough the direct deposition of CVD diamond coatings on ferrous substrates is highly desirable, many technological problems hinder the production of commercial applications, mainly due to a lack of adhesion. Diamond can be grown on such substrates; however, film detachment cannot usually be avoided. Suitable buffer layers are the most commonly used solution to overcome adhesion problems. In the present work, ...
A new interlayer approach for CVD diamond coating of steel substrates
F. J. G. Silva; A.J.S. Fernandes; F.M. Costa; A. P. M. Baptista; E. PereiraA NiyCuyTi multilayer system is proposed to face the typical problems-related with direct diamond deposition on steel substrates, namely the lack of adhesion and growth rates.Systematic experimental work allowed achieving the best MPCVD parameter set in order to obtain both thin and thick diamond films (5–130 mm) with good morphology and adhesion with low residual stress level.In fact, a thick soft copper...
Tribological behaviour of CVD diamond films on steel substrates
F. J. G. Silva; A. J. S. Fernandes; F. M. Costa; V. Teixeira; A. P. M. Baptista; E. PereiraDiamond films have been prepared by microwave plasma chemical vapour deposition (MPCVD) on high-speed steel substrates pre-coated with an intermediate metal multi-layer system. Wear tests were performed in a micro-abrasion apparatus by rotating ball, using a slurry of diamond abrasive particles in water (sphere-on-flat geometry). The tests were carried out on the bare steel substrate, on the substrate provided ...
Microwave plasma chemical vapour deposition diamond nucleation on ferrous subst...
F. J.G. Silva; A. P. M. Baptista; E. Pereira; V. Teixeira; Q.H. Fan; A.J.S. Fernandes; F.M. CostaDiamond coated steel is considered an important issue in synthetic diamond technology due to the great economical importance of enhancing the wear resistance and surface hardness of commercial Fe based alloys. However, direct diamond coating by Chemical Vapour Deposition (CVD) is rather problematic - adhesion and growth are seriously affected. The use of interlayers is a common approach to minimise the referred...
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