MACHINING OF CERAMIC Si3N4-TiN SCAFFOLDS USING MICRO-EDM

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Abstract

Advanced engineering ceramics display excellent mechanical properties such as high hardness, highcompressive strength, chemical stability, wear and thermal shock resistance. Due to their superior performance overother materials, the use of ceramics in a range of different applications is increasing year by year. Bio-ceramics, such asalumina, zirconia, titania, Si3N4-TiN, just to mention a few, have been of interest for many years for orthopaedic anddental applications. However, a number of challenges in their application still remain, including improvements in thematerial properties (mechanical and 'bio-compatible' feasibilities) and in the manufacturing process chain toward thefinal product. Electrical Discharge Machining (EDM) can be successfully employed to machine complex 3D geometriesalso on hard materials exhibiting a brittle behaviour, such as ceramics, on the condition that the limit of their lowelectrical resistivity is overcome. To this aim, some ceramic composites are synthesized using second electroconductivephases comprising Titanium, resulting in ZrO2-TiN, Si3N4-TiN, B4C-TiB2. Moreover, when ceramic-basedscaffolds and prostheses are fabricated, this additional phase seems to have a good physiological impact on cell growthand proliferation. In this paper, micro-EDM manufacturing of different micro-textures for scaffold realization made onSi3N4-TiN is presented and discussed. Different experiments have been performed in order to define optimal micro-EDM electrical parameters in terms of material removal rate (MRR) and tool wear ratio (TWR). Micro-electrodes withdifferent diameters are used for different machining regimes, roughing, semi-finishing and finishing, with the goal ofidentifying minimum geometrical limits on micro-pins textures machining and also taking into account that highaveraged surface roughness is required for this application.

Autore Pugliese

Tutti gli autori

  • F. Modica; V. Marrocco; I. Fassi

Titolo volume/Rivista

Non Disponibile

Anno di pubblicazione

2012

ISSN

Non Disponibile

ISBN

978 88 6608 058 9

Numero di citazioni Wos

Nessuna citazione

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Numero di citazioni Scopus

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Settori ERC

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Codici ASJC

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