J. Garcia

Publications (12)1.87 Total impact

• Article: Influence of micro-blasting on the microstructure and residual stresses of CVD κ-Al2O3 coatings

  C.F. Barbatti, J. Garcia, H. Pinto, A. Kostka, A. Di Prinzio, M. Staia, R. Pitonak, A. R. Pyzalla
  International Journal of Surface & Coatings Technology, v.203, 3708-3717 (2009).
• Article: Influence of WC replacement by TiC and Ta,Nb C on the oxidation resistance of Co based cemented carbides

  C. Barbatti, J. Garcia, P. Brito, A.R Pyzalla
• Article: Influence of nitridation on surface microstructure and properties of graded cemented carbides with Co and Ni binders

  C. Barbatti, J. Garcia, F. Sket, A. Kostka, A.R. Pyzalla
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  ABSTRACT: The influence of a nitridation treatment on the microstructure and the properties of (W,Ti)C-based cemented carbides with Co and Ni binders is investigated. Nitridation results in the formation of a very fine-grained (Ti,Ta,Nb)(C,N) phase (γN-phase) with inclusions of binder and WC clusters in the near-surface region of the cemented carbides. Rietveld refinements of X-ray diffractograms reveal differences in the domain size and the microstrains of the γN-phase for cemented carbides with Co-binder and Ni-binder. Nitridation reduces the domain size and increases microstrains in the γ-phase. The chemical composition, the morphology and defects of the binder were investigated by TEM/EDX before and after the nitridation treatment. The results reveal that a high nitrogen activity leads to the preferred dissolution of the core-rim structure of the mixed cubic carbide grains during the formation of the γN-phase. The nitridation heat treatment improves the wear and corrosion resistance of cemented carbides with both Co-binder and Ni-binder.
  Surface and Coatings Technology 202(24):5962-5975. · 1.87 Impact Factor
• Article: SEM and TEM Investigations of (W,Ti)C-(Co,Ni,Fe) Graded Hardmetals 2006-09-27 - 2006-09-29

  C. Barbatti, F. Sket, D. Eyidi, J. Garcia, A. Pyzalla
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  ABSTRACT: Contribution to a conf. proceeding (book/online)
  Fortschritte in der Metallographie (2006),239-246.
• Article: Influence of binder metal and surface treatment on the corrosion resistance of (W,Ti)C-based hardmetals

  C.F. Barbatti, F. Sket, J. Garcia, A. Pyzalla
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  ABSTRACT: Journal article
  Surf. Coat. Technol. 201(2006)3314,3327.
• Article: SEM and TEM Investigations of (W,Ti)C-(Co,Ni,Fe) Graded Hardmetals 2006-09-27 - 2006-09-29

  C. Barbatti, DESY Forschung mit Photonen, F. Sket, D. Eyidi, J. Garcia, A. Pyzalla
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  ABSTRACT: Conference presentation
• Article: Joining of cemented carbides to steel by laser beam welding

  C. Barbatti, J. Garcia, G. Liedl, A. Pyzalla
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  ABSTRACT: Journal article
  Mat. Wiss. Werkstofftech. 38(2007)11,907-914.
• Article: Joining of hard metals to steel by laser beam welding 2007-03-14 - 2007-03-16

  C. Barbatti, Verbundwerkstoffe und Werkstoffverbunde Bremen Germany, J. Garcia, G. Liedl, A. Pyzalla
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  ABSTRACT: Conference presentation
• Article: Influence of micro-blasting on the microstructure and residual stresses of CVD κ−Al₂O₃ coated hard metals 2007-09-10 - 2007-09-13

  C. Barbatti, European Congress on Advanced Materials and Processes Nürnberg Euromat Germany, H. Pinto, A. Di Prinzio, M. Staia, J. Garcia, R. Pitonak, A. Pyzalla
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  ABSTRACT: Conference presentation
• Article: Influence of micro-blasting on the microstructure and residual stresses of CVD κ−Al₂O₃ coated hard metals 2007-09-24 - 2007-09-26

  C. Barbatti, H. Pinto, J. Garcia, A. Di Prinzio, M. Staia, R. Pitonak, A. Pyzalla
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  ABSTRACT: Conference presentation
• Article: Influence of WC replacement by TiC and (Ta,Nb)C on the oxidation resistance of Co-based cemented carbides

  C. Barbatti, J. Garcia, P. Brito, A. R. Pyzalla
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  ABSTRACT: Journal article
  Int. J. Refract. Met. Hard Mater. 27(2009),768-776.
• Article: Influence of micro-blasting on the microstructure and residual stresses of CVD κ-Al2O3 coatings

  C. Barbatti, J. Garcia, R. Pitonak, H. Pinto, A. Kostka, A. Di Prinzio, M.H. Staia, A.R. Pyzalla
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  ABSTRACT: Cemented carbides coated with CVD multilayers are commonly used in metal cutting turning and milling operations. For many applications, a micro-blasting finishing procedure based on an impact treatment of the surfaces is carried out in order to smooth the coated surface and reduce sharp cutting edges. In this work, micro-blasting with corundum in aqueous solution at pressures between 0.05 and 0.3 MPa was applied to CVD TiN/Ti(C,N)/κ-Al2O3 multilayer coatings deposited onto cemented carbides in order to investigate its influence on the micro-topography, microstructure and residual stresses. The results showed that the micro-blasting reduces the surface roughness and affects the coating thickness. TEM investigations revealed no significant changes on the microstructure of the κ-Al2O3 top layer. Synchrotron X-ray investigations showed that the residual stress state of the as-deposited κ-Al2O3 top layer is not affected by the micro-blasting treatment under the conditions investigated.
  Surface and Coatings Technology.