Tech Briefs Magazine - February 2022 - 24

Materials & Coatings
New Class of Nickel-Based Superalloys Withstands
Extreme Heat
Parts remain crack-free and defect-resistant, making them conducive for use in metal-based
3D-printing applications.
Oak Ridge National Laboratory, Oak Ridge, TN
etal materials have proven to be
cost-effective for manufacturing;
deploying them for use in additive
processes could enable the production
of innovative, complex designs with minimal
material waste. These materials are
primarily used in energy, space, and
nuclear applications that also produce
extreme heat environments.
M
Only a limited number of existing
alloys are amenable to the complex thermal
conditions present during metalbased
additive manufacturing (AM),
where layer-by-layer growth of the component
is achieved through local melting
of metal powder by either a laser or
electron beam energy source.
Resarchers processed a cobalt and nickel
(CoNi) class of superalloys and proved
that they remained crack-free in electronbeam
and laser-melting 3D-printing
processes. CoNi-based superalloys can be
processed through both selective laser
melting (SLM) and electron beam melting
(EBM) manufacturing pathways,
resulting in crack-free components.
Room temperature tensile testing
revealed that CoNi-based superalloys have
an excellent combination of ductility and
strength compared to other Ni-based
superalloys currently being investigated
for AM. The approach demonstrates that
the CoNi-based superalloy compositional
space provides opportunities for the
development of superalloys that can leverage
the potential of AM.
For more information, contact Jennifer J.
Burke at burkejj@ornl.gov; 865-414-6835.
A 3D-printed turbine blade demonstrates the
use of the new class of nickel-based superalloys
that can withstand extreme heat environments
without cracking or losing strength.
(Photo: ORNL/U.S. Dept. of Energy)
Bio-Inspired, Blood-Repelling Glue Seals Wounds Quickly
Inspired by barnacles, the paste provides an effective way to treat traumatic injuries and help
control bleeding during surgery.
Massachusetts Institute of Technology, Cambridge, MA
I
nspired by the sticky substance that barnacles
use to cling to rocks, engineers
have designed a strong, biocompatible
glue that can seal injured tissues and stop
bleeding. The new paste can adhere to
surfaces even when they are covered with
blood and can form a tight seal within
about 15 seconds of application.
Sutures are commonly used to seal
wounds but putting stitches in place is a
time-consuming process that usually isn't
possible for first responders to perform
during an emergency situation. In recent
years, some materials that can halt bleeding,
also called hemostatic agents, have
become commercially available. Many of
these consist of patches that contain clotting
factors that help blood clot on its own.
However, these require several minutes to
form a seal and don't always work on
wounds that are bleeding profusely.
24
Cov
Engineers have designed a strong, biocompatible glue that can seal injured tissues and stop bleeding,
inspired by the sticky substance that barnacles use to cling to rocks. (Photo: MIT)
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Tech Briefs Magazine - February 2022

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