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Analiza spektralna plazmy w procesach azotowania jarzeniowego tytanu technologią aktywnego ekranu

Betiuk M., Maźniak K., Frączek T., Pawelec E.

Inżynieria Powierzchni

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2018

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nr 4

9--19

PL

Azotowanie jarzeniowe tytanu i jego stopów jest jedną z obróbek powierzchniowych umożliwiających wytworzenie warstw o wysokich twardościach. Celem pracy było dokonanie analizy porównawczej składu jakościowego widma procesowego uzyskanego na tytanowym ekranie aktywnym, z widmem wzorcowym w rurkach spektralnych. Plazmę procesową tworzyły gazy Ar, N2, H2 wprowadzane w przestrzeń wylądowania jarzeniowego. Analizowano widmo spektralne w trzech etapach technologii azotowania jarzeniowego tytanu którymi były: przygotowanie komory próżniowej i oprzyrządowania do procesu, aktywacja powierzchni tytanu w wyładowaniu jarzeniowym, azotowanie jarzeniowe tytanu. Przedstawiono badania oceny wpływu temperatury azotowania jarzeniowego na zmianę sygnału spektralnego plazmy H2, N2, Ar oraz analizowano oddziaływanie zmiany proporcji reaktywnych gazów H2, N2 na sygnał spektralny plazmy. Badania te doprowadziły do próby zdefiniowania nowego parametru sterującego składem mieszanki gazowej wprowadzanej w obszar wyładowania jarzeniowego. Do realizacji celów pracy wykorzystano analizator spektralny plazmy oraz stanowisko badawcze — komorę próżniową pozwalającą naprowadzenie procesu azotowania jarzeniowego na potencjale katody, plazmy oraz potencjale uzupełniającym.

EN

The glow discharge nitriding of titanium and its alloys is one of the surface treatments enabling the formation of high hardness layers. The aim of the paper was to perform a comparative analysis of the qualitative composition of the process spectrum obtained on the titanium active screen with the reference spectrum in the spectral tubes. The process plasma was formed by the gases: Ar, N2 H2 introduced into the glow discharge space. The spectral spectrum was analyzed in three stages of the technology of glow discharge nitriding of titanium, which were: preparation of the vacuum chamber and process instrumentation, activation of the titanium surface in glow discharge, glow discharge nitriding of titanium. The paper presents the studies on the evaluation of the influence of the glow discharge nitriding temperature on the change in the plasma spectral signal H2,N2, Ar and analyzes the influence of the change in the proportions of reactive gases H2,N2 on the spectral signal of the plasma. These studies led to an attempt to define a new parameter controlling the composition of the gas mixture introduced into the glow discharge area. To achieve the goals of the paper, a plasma spectral analyzer and a test stand were used - a vacuum chamber allowing the glow discharge nitriding process to be carried out at the cathode, plasma and complementary potential.

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Investigation of surface properties of high temperature nitrided titanium alloys

Koyuncu E., Kahraman F., Karadeniz Ö.

Journal of Achievements in Materials and Manufacturing Engineering

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2009

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Vol. 37, nr 2

434-441

EN

Purpose: The purpose of paper is to investigate surface properties of high temperature nitrided titanium alloys. Design/methodology/approach: In this study, surface modification of Ti6Al4V titanium alloy was made at various temperatures by plasma nitriding process. Plasma nitriding treatment was performed in 80% N2-20% H2 gas mixture, for treatment times of 2-15 h at the temperatures of 700-1000°C. Surface properties of plasma nitrided Ti6Al4V alloy were examined by metallographic inspection, X-Ray diffraction and Vickers hardness. Findings: Two layers were determined by optic inspection on the samples that were called the compound and diffusion layers. Compound layer contain TiN and Ti2N nitrides, XRD results support in this formations. Maximum hardness was obtained at 10h treatment time and 1000°C treatment temperature. Micro hardness tests showed that hardness properties of the nitrided samples depend on treatment time and temperature. Practical implications: Titanium and its alloys have very attractive properties for many industries. But using of titanium and its alloys is of very low in mechanical engineering applications because of poor tribological properties. Originality/value: The nitriding of titanium alloy surfaces using plasma processes has already reached the industrial application stage in the biomedical field.

3

Investigation of surface properties of high temperature nitrided titanium alloys

Koyuncu E., Kahraman F., Karadeniz O.

Archives of Materials Science

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2008

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Vol. 29, nr 1-2

50-62

EN

Titanium and its alloys have very attractive properties for many industries. But using of titanium and its alloys are very low in mechanical engineering applications because of poor tribological properties. In this study, surface modification of Ti6Al4V titanium alloy has been made with various temperatures by plasma nitriding process. Plasma nitriding treatment has been performed in 80% N2-20% H2 gas mixture, for treatment times of 2-15 h at the temperatures of 700-1000 degree C. Surface properties of plasma nitrided Ti6Al4V alloy was examined by metalographic inspection, X-Ray difraction and vichers hardness. Two layers were determined by optic inspection on the samples that called compound and diffusion layers. Compound layer contain TiN and Ti2N nitrides, XRD results support in this formations. Maximum hardness has been obtained at 10h treatment time and 1000 degree C treatment temperature. Micro hardness tests showed that hardness properties of the nitrided samples depend on treatmant time and temperature.