Przewodnictwo cieplne powłokowych barier cieplnych na bazie cyrkonianów ziem rzadkich

• Autorzy: Moskal G.

Warianty tytułu

EN

Thermal conductivity of thermal barrier coatings based on rare earth zirconates

• Języki publikacji: PL

Abstrakty

PL

W artykule dokonano charakterystyki podstawowych właściwości cieplnych powłokowych barier cieplnych na bazie cyrkonianów ziem rzadkich typu Gd2Zr2O7, Nd2Zr2O7, La2Zr2O7 i Sm2Zr2O7 otrzymanych metodą natrysku plazmowego APS. Wykonano badania dyfuzyjności cieplnej metodą laser- flash w zakresie temperatury 25÷1100°C przy ciągłej zmianie temperatury oraz w temperaturze 1100°C przez 10 godzin wygrzewania. Pomiar wykonano na stopie AMS5599, stopie AMS5599 z warstwą NiCrAlY oraz w układzie trójwarstwowym (stop AMS5599 + warstwa NiCrAlY + warstwa ceramiczna RE2Zr2O7). Stosując oprogramowanie Proteus firmy Netzsch oraz wyniki dla układu jednowarstwowego, za pomocą modelu dwuwarstwowego wyznaczono dyfuzyjność cieplną samej warstwy NiCrAlY. Następnie wyznaczono dyfuzyjność cieplną warstwy ceramicznej. Uzyskane wyniki wskazują na mniejszą wartość dyfuzyjności cieplnej i przewodnictwa cieplnego badanych warstw. Stwierdzono ponadto, iż wyniki te są inne niż rezultaty uzyskane dla proszków, co jest związane z wpływem mikrostruktury (porowatości i pęknięcia).

EN

The paper presents the investigation results of the basic thermal properties of thermal barrier coatings based on rare earth zirconates such as Gd2Zr2O7, Nd2Zr2O7, La2Zr2O7 and Sm2Zr2O7 deposited by the air plasma spray (APS) method. Thermal diffusivity measurements using the laser-flash method were performed n the range of 25÷1100°C at a continuously changing temperature and annealing at 1100°C for 10 hours. The measurements were performed on AMS 5599 alloy, AMS 5599 alloy with an NiCrAlY interlayer and AMS 5599 alloy + NiCrAlY interlayer + ceramic layer of RE2Zr2O7 samples. By using NETZSCH Proteus software and the results for the single-layer sample, the thermal diffusivity of the interlayer itself was determined by means of the double-layer model. A similar method was used to determine the thermal diffusivity of the ceramic layer. The obtained results indicate a lower thermal diffusivity and thermal conductivity of the new type of coatings in comparison with standard zirconia based TBCs. Those results are slightly different compared with the results obtained for the initial powders, which indicates the crucial role of the ceramic layer microstructure (crack architecture and porosity).

Słowa kluczowe

PL

TBC; RE2Zr2O7; właściwości cieplne

EN

TBC; RE2Zr2O7; thermal properties

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2014
• Tom: Vol. 35, nr 1
• Strony: 6--12
• Opis fizyczny: Bibliogr. 39 poz., rys.

Twórcy

autor

Moskal G.

• Instytut Nauki o Materiałach, Politechnika Śląska, Katowice

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