Charakterystyka wybranych właściwości cieplnych proszków ceramicznych typu RE2Zr2O7

• Autorzy: Moskal G.

Warianty tytułu

EN

Characteristics of the selected thermal properties of RE2Zr2O7 type ceramic powders

• Języki publikacji: PL

Abstrakty

PL

W artykule przedstawiono wyniki badań charakteryzujące podstawowe właściwości cieplne proszków ceramicznych typu RE2Zr2O7 o strukturze pyrochlorów, przeznaczonych do natryskiwania plazmowego powłokowych warstw barierowych. Badaniom poddano cztery proszki nowego typu, gdzie RE = Gd, Sm, Nd, La oraz standardowy proszek typu ZrO2.8Y2O3. Zakres zrealizowanych badań obejmował ocenę dyfuzyjności cieplnej proszków metodą laser-flash w zakresie temperatury od 25°C do 1500°C. Dokonano również pomiaru ciepła właściwego oraz współczynnika rozszerzalności cieplnej w tym samym zakresie. Badania wykonane zostały na pastylkach otrzymanych w wyniku prasowania. Na podstawie uzyskanych wyników obliczono wartość przewodnictwa cieplnego ceramiki pyrochlorowej, która stanowi podstawowe kryterium oceny i doboru proszków przeznaczonych do natryskiwania powłokowych warstw barierowych. Stwierdzono, że wszystkie cztery proszki nowego typu wykazują zdecydowanie niższą wartość przewodnictwa cieplnego w całym zakresie temperatury.

EN

The paper presents the investigation results characterizing basic thermal properties of RE2Zr2O7 type ceramic powders with pyrochlore structure, designed for plasma spraying of thermal barrier coatings. Four powders of a new type, where RE = Gd, Sm, Nd and La, and standard powder of ZrO2.8Y2O3 type were subjected to the investigation. The investigation scope included thermal diffusivity assessment of the powders with the laser-flash method within the temperature range from 25°C to 1500°C. Specific heat and thermal expansion coefficient measurements were also performed in the same temperature range. Testing was performed on the pellets obtained by pressing the powders. On the basis of the results obtained, thermal conductivity value of the pyrochlore ceramics was calculated, which is the basic criterion for assessment and selection of the powders intended for spraying the thermal barrier coatings. It was found that all four powders of a new type showed a definitely lower value of thermal conductivity within the entire temperature range.

Słowa kluczowe

PL

TBC; RE2Zr2O7; właściwości cieplne

EN

TBC; RE2Zr2O7; thermal properties

• Wydawca: Wydawnictwo SIGMA-NOT
• Czasopismo: Inżynieria Materiałowa
• Rocznik: 2010
• Tom: Vol. 31, nr 4
• Strony: 1107--1112
• Opis fizyczny: Bibliogr. 38 poz., rys., tab.

Twórcy

autor

Moskal G.

• Wydział Inżynierii Materiałowej, Politechnika Śląska,

Bibliografia

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