Wyniki wyszukiwania - BazTech

1

(Ti, Al)N films on titanium alloy produced by means of vacuum arc method

Wieciński P., Smolik J., Garbacz H., Murakami H., Kurzydłowski K. J.

Inżynieria Materiałowa

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2010

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Vol. 31, nr 3

406-409

EN

The paper concerns the (Ti, Al)N thin films on Ti-6Al-4V titanium alloy obtained by means of vacuum arc method. Deposited coatings had 3.5÷3.7 um in thickness and were characterized by homogeneous, free of pores and cracks microstructure with nano grains. These coatings exhibit very high hardness, superior resistance to wear, good temperature stability and excellent oxidation resistance. This paper presences the influence of the parameters of vacuum arc process on the deposition rate, chemical composition, surface roughness, volume fracture of micro droplets and mechanical properties of (Ti, Al)N coatings. During microscopic observation, the special attention has been paid on microstructure of the micro droplets. Chemical composition of the coatings were investigated using GDOES technique. The number of micro droplets was calculated from SEM micrographs of the film's surface.

PL

W artykule przedstawiono wyniki badań dotyczące cienkich powłok (Ti, Al)N otrzymanych metodą łukowo-próżniową na stopie tytanu Ti-6Al-4V. Osadzone powłoki, o grubości w przedziale 3,5÷3,7 um, charakteryzowały się jednorodną, nanokrystaliczną mikrostrukturą. Nie zaobserwowano obecności porowatości oraz pęknięć. Powłoki (Ti, Al)N mają bardzo wysoką twardość, doskonałą odporność na zużycie ścierne, dobrą stabilność termiczną oraz bardzo wysoką odporność na utlenianie. W niniejszej pracy badano wpływ parametrów obróbki łukowo-próżniowej na szybkość osadzania, skład chemiczny, obecność fazy kropelkowej, chropowatość powierzchni oraz twardość powłok (Ti, Al)N. Obserwacje mikroskopowe skupiono na scharakteryzowaniu mikrostruktury fazy kropelkowej. Skład chemiczny powłok określono techniką GDOES. Ilość fazy kropelkowej policzono na podstawie obrazów SEM powierzchni powłok.

2

Measurement and simulation of plasma and shielding gas flows in welding arcs

Dorner K., Fussel U., Schnick M., Zschetzsche J., Guth U., Zosel J.

Systems : journal of transdisciplinary systems science

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2006

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Vol. 11, nr 1

16-21

EN

Gas flows in welding processes were investigated by Particle Image Velocimetry (PIV) as a non intrusive optical method, which enables flow investigations with relatively high spatial and temporal resolution by photographing a two-dimensional flow field twice within a short time interval. The main problem of overexposure of the pictures by the arc radiation can be circumvented by reducing the exposure time below 100 ns and filtering the light at all wavelengths differing from the wavelength of the flashing laser beam more than 3 nm. Magnesium oxide powder with particle size of d < 1 um was used as tracer. The measuring system can be used for optimising the flows of arc- and plasma processes. In combination with a trigger actuation signal the PIV system is able to visualise transient processes like MAG welding or pulsed arc welding. The experimental results are compared with that of numerical analysis based on a newly developed model.

3

Wielowarstwowe powłoki azotkowe na płytkach wieloostrzowych z węglików spiekanych

Dąbrowski M., Mania R., Rutkowska A.

Inżynieria Materiałowa

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2003

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R. XXIV, nr 6

442-444

PL

Na płytki skrawające do głowic frezowych, gatunku SPKN 12 - 03 EDTR z węglików spiekanych, naniesiono dwa rodzaje powłok. Pierwsza składała się z azotku tytanu (TiN) i azotku tytanowo-glinowego (TiAl)N, druga z azotku tytanu i azotku chromu (Cr1-xN). Powłoki nanoszono metodą łukową (Cathodic Arc Deposition) na stanowisku PUSK-83 na Politechnice Krakowskiej. Azotek tytanowo-glinowy nanoszono korzystając ze specjalnej katody wykonanej z gęstego spieku związku metalicznego TiAl. Związek ten otrzymano techniką samorozwijającej się wysokotemperaturowej syntezy SHS (Self-propagation High-temperature Synthesis). Spiek zagęszczano techniką prasowania na gorąco HP (Hot Pressing). Wykonano badania: składu chemicznego i fazowego, mikrotwardości i odporności na ścieranie. Przeprowadzono ocenę jakości powłok w warunkach przemysłowych, na podstawie próby pracą, przy frezowaniu stali stopowej głowicą czołową.

EN

The sintered carbides inserts for milling face cutters were covered with two different coatings. The first one was made of the titanium nitride (TiN) and titanium-aluminium nitride (TiAl)N. The second one has chromium nitride (Cr1-xN) instead of (TiAl)N. The Cathodic Arc Deposition method was used for coatings deposition. The presented films were performed with PUSK-83 system in the laboratory of Cracow Technical University, Poland. To obtain the (TiAl)N layers, the special cathode was used, prepared of TiAl sinter. The intermetallic TiAl was obtained by Self-propagation High-temperature Synthesis (SHS), and then sintered by Hot Pressing (HP). The following investigations were performed. The chemical and the phase composition analysis, the micro-hardness and the abrasion resistance measurements. Additionally the quality evaluation of the coated inserts was done based on the test of the machining of the alloy steel with inserted face milling cutter in the industrial conditions.

4

Próba klasyfikacji stalowych spoiw i łukowych metod spawania według stężęnia tlenu w stopiwie

Węgrzyn T.

Przegląd Spawalnictwa

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1998

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R. 70, nr 5

1-5

5

TiN arc coatings on the former vacuum nitrided substrates of HSS steels.

Kula P., Jachowicz D.

Inżynieria Materiałowa

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1998

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R. XIX, nr 4

1002-1006

EN

The present paper describes the new technology that combines the vacuum nitriding technology known in industry as NITROVAC'79 with following with PVD - arc coating the substrates of HSS steels by TiN. The details of both mentioned above processes are considered from a viewpoint of the combined, composite layer optimisation. Selected problems of TiN coating's adhesion as well as structural transformations of former vacuum nitrided layers during the PVD - arc process have been discussed on the base experimental data. The application range and advantages of new composite layers have been presented in the paper, too.

6

Structure and properties of Cr-CrN and Ti-TiN multilayer coatings obtained by Arc-PVD method.

Mendala B., Swadźba L., Hetmańczyk M.

Inżynieria Materiałowa

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1998

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R. XIX, nr 4

998-1001

EN

Investigation results of forming and properties of protective coatings obtained by the Arc-PVD method on the martensite steel of the EI1961 (13H12NWMFA) type have been presented in the article. The CrN chromium nitride and TiN titanium nitride coatings and Cr/CrN and Ti/TiN multilayer ones were formed. The microstructures of chosen coatings obtained on the scanning electron microscope have been presented. Pitting corrosion test by the potentiodynamic method in the 3.5% NaCl solution and pitting corrosion resistance test in 10% FeCl3, solution were made. Low corrosion resistance of the TiN and Ti/TiN titanium nitride coatings and better properties of multilayer Cr/CrN chromium nitride consisting of the chromium and chromium nitride zones were found.