Detailed surface analyses and improved mechanical and tribological properties of niobium treated by high temperature nitrogen plasma based ion implantation

Oliveira, R. M.; Oliveira, Aline Capella de; Carreri, F.C.; Gomes, G. F.; Ueda, M.; Silva, M.M.N.F.; Pichon, L.; Tóth, A.

doi:10.1016/j.apsusc.2013.06.119

Cited by 14 publications

(15 citation statements)

References 11 publications

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“…Therefore, much less sputtering than in its counterpart is produced, allowing more implantation than re-deposition inside the tube. Finally, temperatures above 1000 • C are now easily accessed for PIII and PIII&D of refractory materials 28 in the batch mode, quickly and stably, thanks to the better plasma confinement using a lid in one side of the tube and the high power used. Non-uniformity of ion implantation is to be addressed in the next experimental studies of PIII&D inside tubes.…”

Section: Discussionmentioning

confidence: 99%

Overcoming sheaths overlapping in a small diameter metallic tube with one end closed and using a high density plasma from a high power pulsed hollow cathode discharge

et al. 2018

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High voltage sheaths are formed when plasmas are produced by application of high negative voltage pulses to conductive supports or components, as in Plasma Immersion Ion Implantation (PIII) treatments of materials surfaces. For parts with concave shape, as inside metal tubes, these sheaths behave quite differently according to the tube configuration and size, as well as, PIII treatment pressure of operation and pulsing parameters. In this work, an SS304 tube of 1.1 cm internal diameter and 20 cm length was pulsed typically at -0.5 to -2.6 kV, 20 μs pulse length, 500 Hz repetition rate, nitrogen pressure of 5x10-2 mbar and with one side closed configuration. Different currents (between 10 and 30 A) were used to produce plasmas with sheaths that overlapped or not, depending on the currents used. To study these sheath behaviors, a simple plasma diagnostic technique based on a bi-dimensional mapping of the deposition of sputtered materials and by etching via the plasma on a Si wafer target surface, both coming out from the tube, was used. This mapping showed clearly the border line situation between overlapping and non-overlapping sheaths in that small tube which allowed to estimate the plasma density to be around 1011 cm-3 at such a sheath condition, as previously anticipated by Sheridan. Above that border condition, nitrogen PIII was successfully obtained in such a small tube of SS304, producing TiN and Ti2N in samples of Ti6Al4V placed inside the tube, when temperatures higher than 800°C were reached there. Below the border, no significant uptake of nitrogen was possible. Using this type of experimental set-up, it is now possible to explore different hollow cathode behaviors, efficient or high temperature (above 800°C) PIII conditions and also new utilizations of the plasma ejected from the tube.

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Section: Discussionmentioning

confidence: 99%

Overcoming sheaths overlapping in a small diameter metallic tube with one end closed and using a high density plasma from a high power pulsed hollow cathode discharge

et al. 2018

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“…In order to avoid the natural oxidation, it is necessary to apply on the cleaned sample surface a process such that the interested area becomes passive. Although anodization 8 is the most common technique, implantation of NbN was chosen to prevent the oxidation of the niobium cavities 9 . NbN behaves as a superconductor at low temperatures and shows excellent resistance to oxidation.…”

Section: Implantationmentioning

confidence: 99%

Development of superconducting klystron cavity for the Mario Schenberg gravitational wave detector

Liccardo¹,

Aguiar²,

Klai³

2017

The Fourteenth Marcel Grossmann Meeting

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Superconducting reentrant cavities can be used in parametric transducers for gravitational wave antennas. The Mario Schenberg detector, which is being built by the GRAVI-TON group at Instituto Nacional de Pesquisas Espaciais (INPE), basically consists of a resonant mass (ball) and a set of parametric transducers in order to monitor the fundamental modes of vibration. When coupled to the antenna, the transducer-sphere system will work as a mass-spring system. In this work the main task is the development of parametric transducers consisting of reentrant superconducting cavity with high performance to be implemented in the Mario Schenberg detector. Many geometries, materials and designs have been tested and compared to optimize parameters such as electric and mechanical Q-factor. The aim is the construction of a complete set of nine parametric transducers that, attached to the spherical antenna, will possibly reach the sensitivity h ∼ 10 −22 Hz −1/2 in the near future.

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“…O nióbio (Nb) é um metal refratário com aplicações no setor aeroespacial, em componentes de motores foguetes, especialmente devido à sua elevada temperatura de fusão, 2468°C [1]. No Brasil, o Laboratório de Combustão e Propulsão do Instituto Nacional de Pesquisas Espaciais (LCP/INPE) tem utilizado o nióbio puro para fabricação de tubeiras de motores foguetes de múltiplos estágios, no estudo do desempenho e análises térmicas de propulsores bipropolentes [2].…”

Section: Introductionunclassified

“…No 3IP, o material a ser tratado é imerso no plasma, sendo submetido a pulsos negativos de média a alta tensão (tipicamente 5 kV a 50 kV), duração de 10 μs a 100 μs e taxa de repetição variando entre 10 Hz a 5 kHz [8]. Resultados promissores foram obtidos, em termos de formação de nitretos de nióbio nas camadas mais superficiais do metal, promovendo melhorias em suas propriedades mecânicas e tribológicas [1].…”

Section: Introductionunclassified

See 1 more Smart Citation

Cordões De Solda De Nióbio Tratados Termicamente via Implantação Iônica Por Imersão Em Plasma

Oliveira¹,

Oliveira²,

Silva³

et al. 2017

TMM

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Detailed surface analyses and improved mechanical and tribological properties of niobium treated by high temperature nitrogen plasma based ion implantation

Cited by 14 publications

References 11 publications

Overcoming sheaths overlapping in a small diameter metallic tube with one end closed and using a high density plasma from a high power pulsed hollow cathode discharge

Overcoming sheaths overlapping in a small diameter metallic tube with one end closed and using a high density plasma from a high power pulsed hollow cathode discharge

Development of superconducting klystron cavity for the Mario Schenberg gravitational wave detector

Cordões De Solda De Nióbio Tratados Termicamente via Implantação Iônica Por Imersão Em Plasma

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