Plasma Nitriding
Mostrando 13-24 de 77 artigos, teses e dissertações.
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13. Effects of Different Plasma Nitrided Layers on the Tribological Performance of DLC Coatings
When multifunctional surface engineering processes that combine purpose-oriented phases are applied to soft substrates, a combination of high wear resistance, high load support and low coefficients of friction can be achieved. In this study, the effects of different nitrided layers on the tribological behaviour of a diamond-like carbon (DLC) film deposited o
Mat. Res.. Publicado em: 12/09/2016
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14. AISI 1005 Steel Plasma Treated by Different Thermochemical Surface Treatments
Abstract To modify the surface structure of AISI 1005 steel and its properties without any dimensional loss, different plasma surface treatments were performed at low temperatures (500 ºC) in this study. The samples were subjected to single plasma treatments including: nitriding (N5% and N3%), carburizing (CE) and ferritic nitrocarburizing (NC) and to duple
Mat. Res.. Publicado em: 01/08/2016
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15. Micro Abrasive Wear Behaviour Study of Carburization and Ion Plasma Nitriding of P20 Steel
P20 steel, which is mainly used in plastic molds, was thermochemically treated by ion plasma nitriding and solid and gas carburization. In this work, the solid and gas carburization were performed at 925 ºC for four different durations. The ion plasma nitriding was performed at 520 ºC for four different durations. The thermochemical treatment increased the
Mat. Res.. Publicado em: 29/04/2016
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16. First Results of Cavitation Erosion Behavior of Plasma Nitrided Niobium: Surface Modification
This work presents the first results of the plasma nitriding study performed in pure niobium in order to increase its cavitation erosion resistance. Samples were prepared from 98.9% purity and 90% reduction cold-rolled niobium bars. Annealing treatment of the cold-worked niobium samples was carried out in vacuum furnace at 1.33 Pa pressure, in the temperatur
Mat. Res.. Publicado em: 03/11/2015
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17. Low-temperature Plasma Assisted Thermochemical Treatments of AISI 420 Steel: Comparative Study of Obtained Layers
Formation of metastable C–, N–, or even Formation of metastable C–, N–, or even C/N– expanded phases can be observed for typical non-equilibrium conditions attained at the plasma assisted thermochemical treatments when temperatures relatively low are used. In present work, kinetics data are considered in a comparative study comprising low-temperatu
Mat. Res.. Publicado em: 03/11/2015
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18. Study of the nitrided layer obtained by different nitriding methods
In this study, plasma nitriding, gas nitriding and solid nitriding were performed in AISI H13, AISI P20 and N-8550 tool steels. The aim of the study was compare the acquired properties after the thermochemical treatments and evaluate the efficiency of the solid nitriding treatment. The samples were analyzed using a microhardness tester and a scanning electro
Matéria (Rio J.). Publicado em: 2015-06
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19. Nitrogen Surface Enrichment of Austenitic Stainless Steel ISO 5832-1: SHTPN vs Low-temperature Plasma Nitriding
Specimens of ISO 5832-1stainless steel were submitted to low temperature plasma nitriding treatment and Solution Heat Treatment after Plasma Nitriding (SHTPN) process aiming to obtain a S-phase, chromium precipitates-free, surface layer. The following techniques were used for analysis: scanning electron microscopy (SEM), optical microscopy (OM), microhardnes
Mat. Res.. Publicado em: 2015-06
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20. Martensitic Stainless Steels Low-temperature Nitriding: Dependence of Substrate Composition
Low-temperature plasma assisted nitriding is a very promising technique to improve surface mechanical properties of stainless steels, keeping unaltered or even improving their surface corrosion resistance. During treatment, nitrogen diffuses into the steel surface, increasing its hardness and wear resistance. In the present work the nitriding process of diff
Mat. Res.. Publicado em: 2015-06
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21. Obtenção de austenita expandida (fase S): Nitretação por plasma em baixa temperatura x SHTPN - Parte 2
Corpos de prova de aço inoxidável austenítico ISO 5832-1 apresentando camada superficial rica em nitrogênio (fase S), obtidas pelos processos de nitretação por plasma em baixa temperatura e SHTPN (Solution Heat Treatment after Plasma Nitriding), caracterizadas em trabalho anterior, além de amostras na condição de fornecimento, ou seja, solubilizadas
Matéria (Rio J.). Publicado em: 2015-06
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22. Improving the Abrasive Wear Resistance of a Microalloyed Steel by Plasma Nitriding
The aim of this work was to study the micro-abrasive wear resistance of an API 5L X-70 microalloyed steel plasma nitrided under different conditions of time and temperature. Pulsed DC plasma nitriding experiments were performed under a treatment atmosphere of 10%N2 + 90%H2, at temperatures of 410, 440 and 470 °C and for nitriding times of 1, 3 and 5h. The r
Mat. Res.. Publicado em: 2015-04
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23. Structural and Mechanical Properties of Radiofrequency Ar-N2 Plasma Nitrided Aluminium
Aluminium (Al) samples were nitrided in 13.56 MHz radiofrequency (RF) discharge of 70:30 vol.% Ar:N2 mixture at substrate temperature of 400 °C and RF power of 300 W for different fill pressures and treatment times. The nitrided samples were then characterized for their structural and mechanical properties using x-ray diffraction (XRD), scanning electron mi
Mat. Res.. Publicado em: 2015-04
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24. On the Nitrogen Diffusion in a Duplex Stainless Steel
Duplex Stainless Steels (DSS) have excellent corrosion resistance properties and poor wear resistance. Plasma nitriding is used to increase the surface hardness, by nitrogen diffusion into the crystal lattice, and to improve wear resistance. In this study, DSS samples were plasma nitrided at temperatures between 350 °C and 500 °C for 240 minutes under an a
Mat. Res.. Publicado em: 2015-04