Aerospace & Defense Technology - April 2021 - 11

and Armament Applications
12
Linear wear, μm

Plasma/ion nitriding is a very efficient method for forming hard surface
layers in ferrous as well as titanium alloys[6]. It is carried out in a vacuum-type
vessel where the glow discharge is generated between the cathode, which is
the treated object, and vessel wall,
which is the anode (Figure 2). Note the
cathodic portion of the glow discharge
covering the parts and central anode in
Figure 2b. Direct current (DC) plasma
used for this type of treatments contains approximately equal concentration of positive ions and electrons as
well as a large number of excited but
neutral species [6]. Energy of nitrogen
N2+, N+ ions and neutrals bombarding
the cathode reaches 200 eV and is sufficient for heating it to a desired temperature and causing minor sputtering of
its surface needed for activation.
The mechanism of plasma nitriding is
very complex; some of the ions are implanted into the surface and the others
just lose their charge and supply active

Martensitic SS

8
4
Titanium Alloy

0
0

20

40

60

80

100

Friction time, min
Figure 1. Linear wear of plasma/ion nitrided two-phase WT3-1 titanium alloy and plasma/ion nitrided
martensitic stainless steel at a constant unit pressure of 400 MPa. (Adopted from [4])

Figure 2a (right). Plasma/ion nitriding of extruder screws
as seen through the port window. (Courtesy of Advanced
Heat Treat Corp. Monroe, Michigan)
Figure 2b (left). Plasma/ion nitriding of large machine
block as seen through the port window. (Courtesy of
Advanced Heat Treat Corp. Monroe, Michigan)

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Aerospace & Defense Technology - April 2021

Table of Contents for the Digital Edition of Aerospace & Defense Technology - April 2021

Aerospace & Defense Technology - April 2021 - Intro
Aerospace & Defense Technology - April 2021 - Sponsor
Aerospace & Defense Technology - April 2021 - Cov1
Aerospace & Defense Technology - April 2021 - Cov2
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Aerospace & Defense Technology - April 2021 - Cov3
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