Spectroscopic investigations of plasma nitrocarburizing processes using an active screen made of carbon in a model reactor

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F18%3A00108856" target="_blank" >RIV/00216224:14310/18:00108856 - isvavai.cz</a>

Výsledek na webu

<a href="https://iopscience.iop.org/article/10.1088/1361-6595/aad035/pdf" target="_blank" >https://iopscience.iop.org/article/10.1088/1361-6595/aad035/pdf</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1088/1361-6595/aad035" target="_blank" >10.1088/1361-6595/aad035</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Spectroscopic investigations of plasma nitrocarburizing processes using an active screen made of carbon in a model reactor

Popis výsledku v původním jazyce

The active screen plasma nitrocarburizing technology significantly reduces the risk of cementite precipitation in the compound layer of nitrocarburized materials and of soot production compared to conventional plasma nitrocarburizing. In a laboratory-scaled plasma nitriding monitoring reactor, PLANIMOR, using an active screen made of carbon, low-pressure pulsed dc N-2-H-2 plasmas have been studied by infrared laser absorption spectroscopy (IRLAS) techniques. Applying IRLAS, using tunable diode lasers (TDL) and a quantum cascade laser (QCL) as radiation sources, the evolution of the concentrations of eight stable molecular reaction products, C2H2, C2H4, CH4, HCN, NH3, CO, C2H6, and C2N2, and of the CH3 radical, have been monitored. By using the line ratio method, the rotational temperatures of HCN and CO could be determined in a range of 300-400 K and 300-500 K, respectively. Analysing the profile of the CH3 Q(3-3) absorption line, the gas temperature of this radical, i.e. the temperature in the vicinity of the plasma zone, has been found to range between 400-800 K. The concentrations of the detected molecular reaction products were found to be in the range of 10(12)-10(16) molecules cm(-3) with HCN and NH3 as the most abundant reaction products. Additionally, the respective conversion efficiencies to the product molecules (R-C approximate to 5 x 10(12) -2 x 10(16) molecules J(-1)) have been determined for different mixing ratios of N-2:H-2 in the feed gas and plasma power values. Taking into account the concentrations of all carbon-containing species, a maximum of the carbon combustion of the screen material of up to 96 mg h(-1) has been found for a N-2-H-2 ratio of 1:1 and the highest plasma power of the screen of P-screen = 106 W.

Název v anglickém jazyce

Spectroscopic investigations of plasma nitrocarburizing processes using an active screen made of carbon in a model reactor

Popis výsledku anglicky

The active screen plasma nitrocarburizing technology significantly reduces the risk of cementite precipitation in the compound layer of nitrocarburized materials and of soot production compared to conventional plasma nitrocarburizing. In a laboratory-scaled plasma nitriding monitoring reactor, PLANIMOR, using an active screen made of carbon, low-pressure pulsed dc N-2-H-2 plasmas have been studied by infrared laser absorption spectroscopy (IRLAS) techniques. Applying IRLAS, using tunable diode lasers (TDL) and a quantum cascade laser (QCL) as radiation sources, the evolution of the concentrations of eight stable molecular reaction products, C2H2, C2H4, CH4, HCN, NH3, CO, C2H6, and C2N2, and of the CH3 radical, have been monitored. By using the line ratio method, the rotational temperatures of HCN and CO could be determined in a range of 300-400 K and 300-500 K, respectively. Analysing the profile of the CH3 Q(3-3) absorption line, the gas temperature of this radical, i.e. the temperature in the vicinity of the plasma zone, has been found to range between 400-800 K. The concentrations of the detected molecular reaction products were found to be in the range of 10(12)-10(16) molecules cm(-3) with HCN and NH3 as the most abundant reaction products. Additionally, the respective conversion efficiencies to the product molecules (R-C approximate to 5 x 10(12) -2 x 10(16) molecules J(-1)) have been determined for different mixing ratios of N-2:H-2 in the feed gas and plasma power values. Taking into account the concentrations of all carbon-containing species, a maximum of the carbon combustion of the screen material of up to 96 mg h(-1) has been found for a N-2-H-2 ratio of 1:1 and the highest plasma power of the screen of P-screen = 106 W.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10305 - Fluids and plasma physics (including surface physics)

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2018

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

PLASMA SOURCES SCIENCE &amp; TECHNOLOGY

ISSN

0963-0252

e-ISSN

1361-6595

Svazek periodika

27

Číslo periodika v rámci svazku

7

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

11

Strana od-do

1-11

Kód UT WoS článku

000439049300001

EID výsledku v databázi Scopus

2-s2.0-85051657006