NASA Technical Reports Server (NTRS) 20050051660: Sintering and Fracture Behavior of Plasma-sprayed Thermal Barrier Coatings

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by  NASA Technical Reports Server (NTRS)

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Sintering and Fracture Pichavior of Plasms-Sprayed Thermal Barricr Coatings

Dengiing Zhu, Sung R. Choi, Robert A. Miller
[NASA Jota H, Glenn Research Contsr
“$000 Brawkpark Road
‘Cleveland, OF 44135,

‘Voormal boric coatings will be more agareasively designcd to prorcer gas bine engine
Tl-seeiiem componims in order in meet Rature engine higher fuel ficiency and lover emission
wala, There in u nee to characterize the Jandamental siowring and fracture behevior of the
cument ZrOx(7-8ywt 04 coating. in onier lo fully ake advange of lhe coating capability.
Tn allition, 9 thorough evaluation of the easing behavio= snd temperature Litnits will he useful

Tor more acemately asszssing the beucfit gained ftom fature advanced coating systems

Tn chis sluly, the sintering behavior of plasma-sprayed ZeOs-Hwr46¥205 coatings wa

systemisally lnvestigated as a fimotion of termporatine and Fime using, a dialpmelar in she

temporn.ure range of 1200-1500°C. The enating sintering hineies uhusined by dilalomeley were
‘compared svth the coating thermal conductivity inoroase Kincties, dormincd by a steady-stars
laser ent-lux testing approach, under high ‘omperstury and thermal yratien! sintering
onditians, The mide J, tide Hy, sed minéd mode Emode IL

ature behavior of as-pracesse
and sinresing-annesled coatings was dotermined in asymmetric Aexure Joxding at ambicut aud
clovated “emperstores in order lo evuluste The coating sintering elTeets on the Iracture envelope

of Ky versus Kp. The eoaticg thermal conductivity eyelic response associated with the fnertice

delautination of the coating systems under simu'uted engine houl-fux gmeltions will be

dliscussed i, conjuneion oth she sintering and tractue testing rosuls,
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