Aerospace & Defense Technology - April 2021 - 10

Plasma Nitride Surface Hardening
of Titanium for Aerospace

T

components used in aerospace and
chemical industries are typically made of
titanium alloyed with aluminum and
vanadium and a two-phase structure.
Those alloys have very high strength-toweight ratios and have been preferred as
the materials for special applications at
very low temperatures from -196° to
-269°C (-320° to -452°F)[2].
Also, the high-temperature properties of titanium alloys
are unique and
further enhance
application of
this metal.

However, in many situations, surface
properties of components made of titanium alloys have to be improved to provide the tribological properties needed
for reducing friction between various
rotating parts, reducing wear or for further enhancement of anti-corrosion
properties. Those properties can be increased by thermochemical treatment
such as nitriding[4]. Figure 1 shows the
wear resistance of nitrided titanium
alloy compared to the wear resistance of
nitrided stainless steel [4, 5].
The general idea behind forming
thermochemical layers is to fortify the
surface of titanium, imparting performance qualities such as hardness, dry-lubrication and corrosion resistance or
cleanliness of the surface. The treatment can greatly extend equipment
lifetimes.

www.aerodefensetech.com

Aerospace & Defense Technology, April 2021

Lead Art (Courtesy NASA/JPL-Caltech)

itanium is irreplaceable in many
industrial applications including
high strength-efficient and corrosion resistant structures [1-3]. It is a nonmagnetic and a low-density element (approximately 60% density of steel) that
can be easily strengthened by proper alloying, heat treatment and deformation
processing [1]. Mechanical

10

Cov

ToC


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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
Aerospace & Defense Technology - April 2021 - 1
Aerospace & Defense Technology - April 2021 - 2
Aerospace & Defense Technology - April 2021 - 3
Aerospace & Defense Technology - April 2021 - 4
Aerospace & Defense Technology - April 2021 - 5
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Aerospace & Defense Technology - April 2021 - Cov3
Aerospace & Defense Technology - April 2021 - Cov4
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