On the influence of carbon contamination of reactor parts in active screen plasma nitrocarburizing processes

被引:11
作者
Burlacov, Igor [1 ]
Hamann, Stephan [2 ]
Spies, Heinz-Joachim [1 ]
Roepcke, Juergen [2 ]
Biermann, Horst [1 ]
机构
[1] TU Bergakad Freiberg, Inst Mat Engn, Gustav Zeuner Str 5, D-09599 Freiberg, Germany
[2] Leibniz Inst Plasma Sci & Technol INP Greifswald, Felix Hausdorff Str 2, D-17489 Greifswald, Germany
关键词
COMPOUND LAYER; SPECTROSCOPY; ABSORPTION; STEELS; IRON;
D O I
10.1063/1.5029228
中图分类号
O59 [应用物理学];
学科分类号
摘要
Compared to conventional plasma nitrocarburizing the active screen plasma nitrocarburizing technology reduces significantly the risk of soot production and cementite precipitation in the compound layer of nitrocarburized materials. However, in long-time treatments, the uncontrollable contamination even up to full saturation of the metallic active screen and of the walls of the used plasma reactor with carbon compounds is still a remaining factor of uncertainty. It may result in an increased carbon concentration or even in an appearance of the cementite phase in the compound layer of the treated steel surface, as in the case of 42CrMo4 (AISI 4140). The absolute concentration of hydrogen cyanide (HCN), in situ monitored by tunable diode laser absorption spectroscopy, and the emission intensity of the CN (0-0) band of the violet system at a wavelength of lambda = 388 nm, recorded by optical emission spectroscopy, were found to be reliable parameters to control the carburizing potential of the nitrocarburizing plasma. A close relationship was found between (i) the concentration of HCN and the CN band emission intensity with (ii) the level of the methane admixture in the feed gas and the time-dependent contamination effects of the active screen and other inner reactor surfaces with carbon compounds. Therefore, this relation could serve as a basis for an in-line control of the carburizing activity in plasma nitrocarburizing processes with methane admixture using an active screen. Published by AIP Publishing.
引用
收藏
页数:8
相关论文
共 31 条
[1]   Environmental and technical aspects of plasma nitrocarburising [J].
Bell, T ;
Sun, Y ;
Suhadi, A .
VACUUM, 2000, 59 (01) :14-23
[2]   In-line Process Control in the Active Screen Plasma Nitrocarburizing Using a Combined Approach Based on Infrared Laser Absorption Spectroscopy and Bias Power Management [J].
Burlacov, I. ;
Hamann, S. ;
Spies, H. -J. ;
Roepcke, J. ;
Biermann, H. .
HTM-JOURNAL OF HEAT TREATMENT AND MATERIALS, 2016, 71 (04) :141-147
[3]   In-situ monitoring of plasma enhanced nitriding processes using infrared absorption and mass spectroscopy [J].
Burlacov, I. ;
Boerner, K. ;
Spies, H. -J. ;
Biermann, H. ;
Lopatik, D. ;
Zimmermann, H. ;
Roepcke, J. .
SURFACE & COATINGS TECHNOLOGY, 2012, 206 (19-20) :3955-3960
[4]  
Burlacov I., 2014, J INT HEAT TREAT SUR, V8, P139, DOI [10.1179/1749514814z.000000000108, DOI 10.1179/1749514814Z.000000000108]
[5]   Gaseous carburising of self-passivating Fe-Cr-Ni alloys in acetylene-hydrogen mixtures [J].
Christiansen, T. L. ;
Hummelshoj, T. S. ;
Somers, M. A. J. .
SURFACE ENGINEERING, 2011, 27 (08) :602-608
[6]   Wall material interaction with the active species in a nitrogen-methane DC flowing discharge [J].
Ciobotaru, L. C. ;
Popa, D. S. .
VACUUM, 2014, 110 :183-189
[7]  
Delmas B., 2005, European patent, Patent No. [EP1274873B1, 1274873]
[8]  
Denzer A., 1993, German patent, Patent No. [DE4211395, 4211395]
[9]  
Edenhofer B., 2015, WOODHEAD PUBLISHING, V62, P531
[10]   Comparison of ferritic and austenitic plasma nitriding and nitrocarburizing behavior of AISI 4140 low alloy steel [J].
Fattah, M. ;
Mahboubi, F. .
MATERIALS & DESIGN, 2010, 31 (08) :3915-3921