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    Artigo IPEN-doc 09697
    Influence of processing parameters on the microstructure and oxidation behavior of hot pressed Ni-20Cr + WC metal matrix composites
    2003 - KUNIOSHI, C.T.; CORREA, O.V.; BELLINATI, C.E.; RAMANATHAN, L.V.
    Ni20Cr+WC composites with a gradient in the volume fraction of hard WC particles are ideal materials for applications where high temperature oxidation and erosion resistance are desired properties. The WC particles impart erosion resistant and the Cr content of the alloy, oxidation resistance. This paper presents the influence of WC particle content and consequently the extent of densification, on the oxidation behavior of hot pressed Ni20Cr+WC composites. Oxidation measurements in the range 700-1000°C revealed overall parabolic behavior. The increase in oxidation rate with WC content has been attributed to formation of islands of WO3 globules protruding through the Cr2O3.
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    Artigo IPEN-doc 09707
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    Artigo IPEN-doc 10935
    Corrosion and cytotoxicity evaluation of AISI 316L stainless steel produced by powder injection molding (PIM) technology
    2005 - COSTA, I.; ROGERO, S.O.; CORREA, O.V.; KUNIOSHI, C.T.; SAIKI, M.
    This study investigates the in vitro corrosion and cytotoxicity response of AISI 316L stainless steel produced by powder injection molding (PIM) technology in a solution that simulates physiological fluids (MEM) by electrochemical techniques and neutral red uptake cytotoxicity assay. The results were compared with those of AISI 316L produced by conventional metallurgy. Both steels showed high corrosion resistance and no toxic effect in the cytotoxicity test. The corrosion products were analyzed by instrumental neutron activation analysis (INAA). The surfaces of the alloys were evaluated before and after corrosion test by scanning electron microscopy and a passive behaviour was indicated supporting the results from other techniques.