Powłokowe bariery cieplne typu DCL

• Autorzy: Moskal G.

Warianty tytułu

EN

DCL type thermal barrier coatings

• Języki publikacji: PL

Abstrakty

PL

W artykule przedstawiono wyniki mikrostrukturalnych badań powłokowych barier cieplnych typu DCL, tzn. otrzymanych w wyniku natrysku plazmowego dwóch różnych materiałów ceramicznych: 8YSZ i RE2Zr2O7 (gdzie RE = Gd, La, Sm, Nd). Wewnętrzną część warstwy izolującej otrzymano w wyniku natrysku proszku konwencjonalnego 8YSZ bezpośrednio na warstwę żaroodporną NiCrAlY. Strefę zewnętrzną stanowiła warstwa uzyskana w wyniku osadzenia cyrkonianów ziem rzadkich. Ocenie poddano mikrostrukturę warstw, ich grubość i budowę. Stwierdzono, że uzyskano warstwy o grubości od 250 do 320 μm, złożone z trzech stref o zbliżonej grubości. Poza strefami zewnętrzną i wewnętrzną wykazano obecność strefy przejściowej złożonej z 8YSZ oraz RE2Zr2O7. Analizowano również budowę morfologiczną warstwy wierzchniej powłok TBC. Scharakteryzowano jakościowo i ilościowo topografię powierzchni wszystkich badanych powłok. Wykonano badania dyfrakcyjne, które pozwoliły na określenie składu zewnętrznej warstwy izolującej, a także na tej podstawie metodą sin2ψ oszacowano stan naprężeń.

EN

The paper presents the results of microstructural investigations of DCL (double ceramic layer) thermal barrier coatings. The term DCL describes insulating the top surface of a TBC system which comprises two different ceramic materials. It consisted of the zirconates of rare earth elements as the outer part and conventional 8YSZ as the inner part. The obtained DCLs were characterized in terms of their topography, morphology, microstructure, thicknesses of the sublayers and phase composition. The thickness of the obtained DCL’s ranged from 250 to 320 μm, and the entire layers consisted of three sublayers: inner (8YSZ), outer (RE2Zr2O7) and transition, the latter being a mixture of 8YSZ and RE2Zr2O7). Stresses were assessed using XRD measurements and a sin2ψ approach.

Słowa kluczowe

PL

powłoki TBC; DLC; cyrkoniany pierwiastków ziem rzadkich

EN

TBC coating; DCL; zirconates of rare earth

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2014
• Tom: Vol. 35, nr 4
• Strony: 303--307
• Opis fizyczny: Bibliogr. 40 poz., rys., tab.

Twórcy

autor

Moskal G.

• Instytut Nauki o Materiałach, Politechnika Śląska, Katowice

Bibliografia

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