Medical Design Briefs - January 2022 - 17

amongst the pure grades of titanium and
grade 5 alloy is biocompatible and
exhibits excellent tribological properties,
according to the 2017 IOP Conf. Series
document " Materials Science and
Engineering. "
However, with salt bath nitriding,
there is a post-treatment requiring a
high washing effort to remove the residual
cyanate salt. In addition, there are
disposal costs for salt and washing lye
and environmental handling costs, as
well as safety and operational liabilities.
Gas nitriding (500 °C) and gas nitro -
carburizing (540-580 °C) are universally
accepted procedures, and typically re -
quire a high concentration of ammonia
(NH3), and a high amount of carrier gas
flow (normal pressure process) compared
with pulse plasma nitriding. The elemental
nitrogen gas constituent diffuses into
iron and forms hard nitrides.
Because of the reduced temperature
compared to carburizing, no quenching is
necessary, and therefore the chance for
distortion and cracking are lower.
Disadvantages of gas nitriding are that it
requires the use of flammable gases like
ammonia, requires high gas consumpOSTEOARTHRITIS
REPLACEMENT
elbow
cervical
spine
toes
fingers
knee
ankle
hip
Enhanced surface properties of implantable alloys crucial in medical device applications such as artificial
hip and knee implants that depend on well-engineered biomaterials. (Credit: PVA TePla)
tion, and it is not able to treat nitride rustand
acid-resistant steels.
With recent advancements in pulse
plasma nitriding, however, a new level of
precision and control results in uniform
and consistent case hardening. Together
with the advantages of using environmentally
friendly gases only - in contrast
to the use of ammonia in gas nitriding
- plasma-based nitriding has
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Medical Design Briefs, January 2022
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17

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Medical Design Briefs - January 2022

Table of Contents for the Digital Edition of Medical Design Briefs - January 2022

Medical Design Briefs - January 2022 - Intro
Medical Design Briefs - January 2022 - Sponsor
Medical Design Briefs - January 2022 - Cov1a
Medical Design Briefs - January 2022 - Cov1b
Medical Design Briefs - January 2022 - Cov1
Medical Design Briefs - January 2022 - Cov2
Medical Design Briefs - January 2022 - 1
Medical Design Briefs - January 2022 - 2
Medical Design Briefs - January 2022 - 3
Medical Design Briefs - January 2022 - 4
Medical Design Briefs - January 2022 - 5
Medical Design Briefs - January 2022 - 6
Medical Design Briefs - January 2022 - 7
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Medical Design Briefs - January 2022 - Cov3
Medical Design Briefs - January 2022 - Cov4
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