OLANDIR VERCINO CORREA
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Artigo IPEN-doc 28904 Enhancement of the RE-boronizing process through the use of La, Nd, Sm, and Gd compounds2021 - SANTAELLA, CESAR R.K.; COTINHO, SAMUEL P.; CORREA, OLANDIR V.; PILLIS, MARINA F.Rare-earth elements have been used in the thermochemical treatment of boronizing to enhance boron diffusion. In order to further investigate the effect of these elements on the process, neodymium-, samarium-, and gadolinium were utilized for the treatment of AISI 1045 samples carried out at the temperature of 1173 K for 4 h. The resulting boride layers formed were characterized through optical microscopy, microhardness test, and X-ray diffraction (XRD). The comparison of the layers showed that the addition of neodymium increased the depth by 48%, with samarium by 54%, and with gadolinium by 76%.Artigo IPEN-doc 28886 Enhancement of the RE-boronizing process through the use of La, Nd, Sm, and Gd compounds2022 - SANTAELLA, CESAR R.K.; COTINHO, SAMUEL P.; CORREA, OLANDIR V.; PILLIS, MARINA F.Rare-earth elements have been used in the thermochemical treatment of boronizing to enhance boron diffusion. In order to further investigate the effect of these elements on the process, neodymium-, samarium-, and gadolinium were utilized for the treatment of AISI 1045 samples carried out at the temperature of 1173 K for 4 h. The resulting boride layers formed were characterized through optical microscopy, microhardness test, and X-ray diffraction (XRD). The comparison of the layers showed that the addition of neodymium increased the depth by 48%, with samarium by 54%, and with gadolinium by 76%.Artigo IPEN-doc 26899 Propriedades das camadas termodifundidas de boro e lantânio no aço AISI 10452019 - SANTAELLA, CESAR R.K.; CORREA, OLANDIR V.; COTINHO, SAMUEL P.; PILLIS, MARINA F.A boretação é um processo termoquímico de difusão de boro no estado sólido que tem por objetivo aumentar a resistência ao desgaste através da formação de uma camada dura de boretos de ferro na superfície do aço. As propriedades dessas camadas podem ser alteradas com a difusão combinada de boro com outros elementos químicos simultaneamente, como por exemplo o alumínio, para elevar a resistência à oxidação, ou o vanádio, para elevar a resistência ao desgaste superficial. Neste trabalho são apresentados os resultados obtidos com a difusão combinada de boro e lantânio.