Aerospace & Defense Technology - December 2021 - 30

Tech Briefs
Polyurethane with isosorbide and TDI room temperature cure (left) and after post cure (right).
each on the Thinky ARE-250 mixer,
followed by a 2-minute defoaming
cycle. The second mixing method involved
placing the sample vial in the
Aquasonic sonicator 75D for 20-30
min. The temperature of the water was
regulated between 25 and 50°C. The
parameters set for this solubility study
were that the blends should remain in
solution upon standing at room temperature
for 24 hours. The Thinky ARE250
mixer proved ineffective for creating
a homogeneous mixture. After
three mixing cycles at 2,000 rpm for 10
minutes plus 2 minutes of defoaming,
the blends were foamy, white, and contained
noticeable amounts of undissolved
isosorbide.
On the other hand, the Aquasonic
sonicator mixing method resulted in
clear, slightly yellow homogeneous
blends. The temperature increase (2550°C)
most likely helped the isosorbide
dissolve into the carrier diols/
polyol. After the mixing method was
established, the maximum load of
isosorbide in each individual carrier
was determined. The maximum load
of isosorbide was also determined in
various combinations with the diol/
polyol blends. Isosorbide at 50-70 wt%
of the polyol blend was able to stay in
solution upon standing for 24 hours at
room temperature. Mixtures containing
isosorbide at 80-90 wt% did dissolve
into solution but crystallized
overnight.
This work was done by Faye R. Toulan of,
TKC Global, and Joshua M. Sadler, and John
J. La Scala for the Army Research Laboratory.
For more information, download the
Technical Support Package (free white
paper) at www.aerodefensetech.com/tsp
under the Manufacturing & Materials
category. ARL-0021
Cold Sprayed Coatings with Dual Nanoparticle
Reinforcements for Wear and Corrosion Protection
As a form of additive manufacturing, the use of cold spray has made significant strides since different-sized
particles were explored in the process. There is proof that micron-sized particles down to
nanoparticles enhance the mechanical material properties of a substrate in wear resistance.
Naval Postgraduate School, Monterey, California
S
hips and the components onboard
ships experience high degrees of
stress from sea motion, operational loads,
and frequent operational changes. As
such, excessive component wear, protective
coating deterioration, and complete
mechanical failure is not uncommon.
When this occurs, repair is based on a
timeline that accounts for the degree of
mission impact, availability of parts, and
operational requirements. Often repair or
replacement is limited by what personnel
can perform locally. This can result in delaying
repair or replacement of deficient
components (sometimes for years) until
30
Intro
Cov
operational requirements can support a
shipyard maintenance period.
Having degraded or broken components
fosters an environment where
personnel live with deficiencies and
contributes to overall ship degradation.
Therefore, providing the ship or unit
with more tools to enable the repair of
components on station is vital to supporting
the overall Department of Defense
mission.
Frequently sailors use paint onboard
ships to place a nonreactive barrier between
bare metal and a corrosive at-sea
environment. This is very helpful for rewww.aerodefensetech.com
ToC
+
-
ducing
general corrosion, but paint can
chip or delaminate, exposing a metal
surface and resulting in localized corrosion
if the exposed metal is not repainted.
In addition, paint has minimal
use for wear or impact applications. In
the event of high wear against a painted
surface, the topcoat can easily be worn
away, often requiring a reapplication of
the paint coat.
Physical Vapor Deposition (PVD) and
Chemical Vapor Deposition (CVD) are
two methods of depositing coatings uniformly
around a substrate within a closed
environment. It is possible to obtain a
Aerospace & Defense Technology, December 2021
A
µ
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http://www.aerodefensetech.com/tsp http://www.aerodefensetech.com http://info.hotims.com/79420-922

Aerospace & Defense Technology - December 2021

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

Aerospace & Defense Technology - December 2021 - Intro
Aerospace & Defense Technology - December 2021 - Sponsor
Aerospace & Defense Technology - December 2021 - Cov1
Aerospace & Defense Technology - December 2021 - Cov2
Aerospace & Defense Technology - December 2021 - 1
Aerospace & Defense Technology - December 2021 - 2
Aerospace & Defense Technology - December 2021 - 3
Aerospace & Defense Technology - December 2021 - 4
Aerospace & Defense Technology - December 2021 - 5
Aerospace & Defense Technology - December 2021 - 6
Aerospace & Defense Technology - December 2021 - 7
Aerospace & Defense Technology - December 2021 - 8
Aerospace & Defense Technology - December 2021 - 9
Aerospace & Defense Technology - December 2021 - 10
Aerospace & Defense Technology - December 2021 - 11
Aerospace & Defense Technology - December 2021 - 12
Aerospace & Defense Technology - December 2021 - 13
Aerospace & Defense Technology - December 2021 - 14
Aerospace & Defense Technology - December 2021 - 15
Aerospace & Defense Technology - December 2021 - 16
Aerospace & Defense Technology - December 2021 - 17
Aerospace & Defense Technology - December 2021 - 18
Aerospace & Defense Technology - December 2021 - 19
Aerospace & Defense Technology - December 2021 - 20
Aerospace & Defense Technology - December 2021 - 21
Aerospace & Defense Technology - December 2021 - 22
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Aerospace & Defense Technology - December 2021 - 24
Aerospace & Defense Technology - December 2021 - 25
Aerospace & Defense Technology - December 2021 - 26
Aerospace & Defense Technology - December 2021 - 27
Aerospace & Defense Technology - December 2021 - 28
Aerospace & Defense Technology - December 2021 - 29
Aerospace & Defense Technology - December 2021 - 30
Aerospace & Defense Technology - December 2021 - 31
Aerospace & Defense Technology - December 2021 - 32
Aerospace & Defense Technology - December 2021 - 33
Aerospace & Defense Technology - December 2021 - 34
Aerospace & Defense Technology - December 2021 - 35
Aerospace & Defense Technology - December 2021 - 36
Aerospace & Defense Technology - December 2021 - 37
Aerospace & Defense Technology - December 2021 - 38
Aerospace & Defense Technology - December 2021 - 39
Aerospace & Defense Technology - December 2021 - 40
Aerospace & Defense Technology - December 2021 - Cov3
Aerospace & Defense Technology - December 2021 - Cov4
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