JTST Spotlights
This month's spotlight is:
"Knowledge
Concerning Splat Formation: An Invited Review"
P. Fauchais, M. Fukumoto, A. Vardelle, and M. Vardelle
JTST 13(3) September 2004
This paper
summarizes our knowledge at the beginning of 2003 about splat formation.
Studies related to the effect of various parameters on particle flattening
include the characteristics of particles prior to impact: normal impact
velocity, temperature, molten state, oxidation state, etc.; the parameters
related to the substrate: tilting angle, roughness, oxide layer composition,
thickness and crystallinity, desorption of adsorbates and condensates,
wetting properties between impacting particle and substrate, etc.; and,
finally, the parameters related to the heat exchange between the flattening
particle and the substrate.
Read
the article (pdf format)
"Analysis
of Retrieved Hydroxyapatite-Coated Hip Prostheses"
K.A. Gross, W. Walsh, and E. Swarts
JTST 13(2) June 2004
Hydroxyapatite
(HAp) coatings are used extensively on orthopaedic devices to improve
the adhesion of bone to the prosthesis, increasing the integrity and longevity
of the implanted prosthesis. While HAp coatings have been recognized to
provide many benefits, the sensitivity of HAp to loads and dissolution
is not widely known. Insertion procedure, type of bone adjacent to the
coating, and extent of bending of the coated implant all influence coating
integrity. This paper analyzes the microstructure of several retrieved
HAp coated orthopedic devices in cross-section and from the surface to
illustrate the importance of the coating microstructure on the functionality
and performance of the coating.
Read
the article (pdf format).
"Plasma
Stream Apparatus and Methods - JTST Historical Patent #32"
Gabriel M. Giannini and Adriano C. Ducati
JTST 12(4) December 2003
Part of JTST's
continuing series of Historical Patents, this 1958 application describes
a practical, commercial plasma stream apparatus and methods for effecting
dynamic constriction of an electric arc by means of gas, producing a high
current-density arc and a very high temperature plasma stream or jet.
Read
the article (pdf format).
Journal
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