Invited review: Machine learning for materials developments in metals additive manufacturing
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36 MATERIALS SCIENCE↗
Engineering topics
Johnson, N. S.
Publications and source records attributed to Johnson, N. S..
CMAS Interactions with Advanced Environmental Barrier Coatings Deposited via Plasma Spray- Physical Vapor Deposition
Materials for advanced turbine engines are expected to have temperature capabilities in the range of 1370-1500C. At these temperatures the ingestion of sand and dust particulate can result in the formation of corrosive glass deposits referred to as CMAS. The presence of this glass can both thermomechanically and thermochemically significantly degrade protective coatings on metallic and ceramic components. Plasma Spray- Physical Vapor Deposition (PS-PVD) was used to deposit advanced environmental barrier coating (EBC) systems for investigation on their interaction with CMAS compositions. Coatings were exposed to CMAS and furnace tested in air from 1 to 50 hours at temperatures ranging from 1200-1500C. Coating composition and crystal structure were tracked with X-ray diffraction and microstructure with electron microscopy.
Coatings↗
Participation of Ames Research Center in the MSC-4 experiment
Equipment and ground stations for laser radar and communication experiment MSC-4 on Gemini 7 flight
Johnson, N. S.↗
STABILITY AND CONTROL CHARACTERISTICS AT SUBSONIC SPEEDS OF A FLAT-TOP ARROWHEAD WING-BODY COMBINATION
Stability and control of flat surface wing- fuselage combination at subsonic speed - effect of wing leading edge sweepback
WING-FUSELAGE COMBINATION↗