Surface hardening of piston rings by nitriding in glow discharge

1982 ◽  
Vol 24 (5) ◽  
pp. 349-351 ◽  
Author(s):  
A. D. Sokolov
Keyword(s):  
Glow Discharge ◽  
Surface Hardening ◽  
Piston Rings ◽  
Nitriding In Glow Discharge

Nitriding in glow discharge

1974 ◽  
Vol 16 (3) ◽  
pp. 249-251
Author(s):  
P. S. Sirotinskii
Keyword(s):  
Glow Discharge ◽  
Nitriding In Glow Discharge

Preliminary experiment of surface hardening of polymers by glow discharge polymerization

1982 ◽  
Vol 27 (12) ◽  
pp. 4655-4660 ◽  
Author(s):  
K. S. Chen ◽  
N. Inagaki ◽  
K. Katsuura
Keyword(s):  
Glow Discharge ◽  
Surface Hardening

scholarly journals HYDROGEN-FREE NITRIDING IN GLOW DISCHARGE WITH INDEPENDENT PARAMETERS OF THE PROCESS

2019 ◽  
Vol 271 (2) ◽  
pp. 11-16
Author(s):  
M. YE. SKYBA ◽  
◽  
M. S. STECHYSHYN ◽  
M. V. LUKIANIUK ◽  
V. P. OLEKSANDRENKO ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Nitriding In Glow Discharge ◽  
Independent Parameters

scholarly journals Surface Hardening of Massive Steel Products in the Low-pressure Glow Discharge Plasma

Technologies ◽  
2019 ◽  
Vol 7 (3) ◽  
pp. 62 ◽  
Author(s):  
Sergey Grigoriev ◽  
Alexander Metel ◽  
Marina Volosova ◽  
Yury Melnik ◽  
Htet Ney ◽  
...  
Keyword(s):  
Glow Discharge ◽  
Surface Hardening ◽  
Nitrided Layer ◽  
Electrical Power ◽  
Surface Hardness ◽  
High Energy ◽  
Discharge Voltage ◽  
Glow Discharge Plasma ◽  
Structural Defects ◽  
Order Of Magnitude

A process vacuum chamber is filled with a homogeneous plasma of glow discharge with electrostatic electron confinement, which is used for surface hardening of massive products. At the current of 2–20 A and the gas pressure ranging from 0.1 to 1 Pa the discharge voltage amounts to 350–500 V. When a bias voltage of 2 kV is applied to an immersed in the plasma hollow cylinder with a mass of 15 kg, electrical power spent on heating it by accelerated ions exceeds by an order of magnitude the power spent on the discharge maintenance. The massive cylinder is heated up to 700 °C for 15 min. When argon mixture with nitrogen (30%) is used, the nitriding for 3h results in an increase in the surface hardness from 400 up to 1000 HV50 and the nitrided layer thickness grows to ~100 μm. The nitriding rate is enhanced by a high degree of nitrogen dissociation due to decomposition by fast electrons and surface structural defects due to bombardment by high-energy ions.

scholarly journals Gas-Dynamic Specifications of Glow Discharge During Ion Nitriding Process

2018 ◽  
Vol 17 (5) ◽  
pp. 368-377
Author(s):  
M. N. Bosyakov ◽  
A. A. Kozlov
Keyword(s):  
Glow Discharge ◽  
Flow Rate ◽  
Current Density ◽  
Discharge Current ◽  
Surface Hardening ◽  
Nitriding Process ◽  
Vacuum System ◽  
Ion Nitriding ◽  
Discharge Current Density ◽  
Gas Dynamic

Ion-plasma nitriding in glow discharge is a widely used method of surface hardening in the industrialized countries of the world and it is the most modern and technological type of surface hardening of machine parts, molds, dies and cutting tools. However there is no detailed review in the literature of technical characteristics and operation of a gas-vacuum part in ion nitriding units and it does not allow estimating electric power consumption for operation of a gas-vacuum system while assessing efficiency of the given equipment. The paper considers problems pertaining to relationship of gas-dynamic parameters of the nitriding process (pressure and gas flow rate) and energy characteristics of the glow discharge (current density, discharge voltage) during ion nitriding at industrial plants and their impact on the process. Calculation-practical modeling of a vacuum system for an ion nitriding installation shows that it is advisable to use vacuum units which represent consistently connected forevacuum and two-rotor pumps in order to ensure independent control of a pumping speed and flow rate of the gas mixture. Such approach makes it possible to carry out nitriding processes in a wide range of pressures with the possibility to provide high plasma gas rates at a low pressure, in particular, when processing large areas. The paper has revealed temperature interrelations, chamber pressure and glow discharge current density that ensure its existence in the abnormal form. It has been shown that at lower operational pressure during the process, higher degree of discharge abnormality can be provided at uniform temperature of the batch. Due to this it is possible to attain higher temperature similarity which ensures uniformity of a nitrided layer on all parts of the batch.

Ion nitriding in glow discharge with hollow cathode effect

2007 ◽  
Vol 49 (7-8) ◽  
pp. 358-361 ◽  
Author(s):  
V. V. Budilov ◽  
R. D. Agzamov ◽  
K. N. Ramazanov
Keyword(s):  
Glow Discharge ◽  
Hollow Cathode ◽  
Ion Nitriding ◽  
Nitriding In Glow Discharge
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