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Papers by Maxson Vieira

Research paper thumbnail of Enhancement of acetylene gas sensing properties for a ZnO-based gas sensor produced by plasma immersion ion implantation and deposition

Materials Science in Semiconductor Processing

Research paper thumbnail of Effects of the High-Temperature Plasma Immersion Ion-Implantation Treatment on Corrosion Behavior of Ti-6Al-4V

IEEE Transactions on Plasma Science, 2000

Although titanium and its alloys own good mechanical properties and excellent corrosion resistanc... more Although titanium and its alloys own good mechanical properties and excellent corrosion resistance, these materials present poor tribological properties for specific applications that require wear resistance. In order to produce wear-resistant surfaces, this work is aimed at achieving improvement of wear characteristics in Ti-Si-B alloys by means of high temperature nitrogen plasma immersion ion implantation (PIII). These alloys were produced by powder metallurgy using high energy ball milling and hot pressing. Scanning electron microscopy (SEM) and X-ray diffraction identified the presence of α-titanium, Ti 6 Si 2 B, Ti 5 Si 3 , TiB and Ti 3 Si phases. Wear tests were carried out with a ball-on-disk tribometer to evaluate the friction coefficient and wear rate in treated and untreated samples. The worn profiles were measured by visible light microscopy and examined by SEM in order to determine the wear rates and wear mechanisms. Ti-7.5Si-22.5B alloy presented the highest wear resistance amongst the untreated alloys produced in this work. High temperature PIII was effective to reduce the wear rate and friction coefficient of all the Ti-Si-B sintered alloys.

Research paper thumbnail of Enhancement of acetylene gas sensing properties for a ZnO-based gas sensor produced by plasma immersion ion implantation and deposition

Materials Science in Semiconductor Processing

Research paper thumbnail of Effects of the High-Temperature Plasma Immersion Ion-Implantation Treatment on Corrosion Behavior of Ti-6Al-4V

IEEE Transactions on Plasma Science, 2000

Although titanium and its alloys own good mechanical properties and excellent corrosion resistanc... more Although titanium and its alloys own good mechanical properties and excellent corrosion resistance, these materials present poor tribological properties for specific applications that require wear resistance. In order to produce wear-resistant surfaces, this work is aimed at achieving improvement of wear characteristics in Ti-Si-B alloys by means of high temperature nitrogen plasma immersion ion implantation (PIII). These alloys were produced by powder metallurgy using high energy ball milling and hot pressing. Scanning electron microscopy (SEM) and X-ray diffraction identified the presence of α-titanium, Ti 6 Si 2 B, Ti 5 Si 3 , TiB and Ti 3 Si phases. Wear tests were carried out with a ball-on-disk tribometer to evaluate the friction coefficient and wear rate in treated and untreated samples. The worn profiles were measured by visible light microscopy and examined by SEM in order to determine the wear rates and wear mechanisms. Ti-7.5Si-22.5B alloy presented the highest wear resistance amongst the untreated alloys produced in this work. High temperature PIII was effective to reduce the wear rate and friction coefficient of all the Ti-Si-B sintered alloys.

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