Influence of structure and technology of drawing of multilayer heat-protective coatings produced by thermal spraying dusting on thermal conductivity

Loshinin U.V., Razmakhov M.G., Pahomkin S.I., Lutsenko A.N.
UDC
621.793.71
DOI
10.18577/2307-6046-2019-0-6-95-103
Article PDF (Russian) (734.22 KB)
How to cite
Loshinin U.V., Razmakhov M.G., Pahomkin S.I., Lutsenko A.N. Influence of structure and technology of drawing of multilayer heat-protective coatings produced by thermal spraying dusting on thermal conductivity // Proceedings of VIAM. 2019. No. 6. DOI: 10.18577/2307-6046-2019-0-6-95-103. URL: https://test.viam.ru/en/journal/2019/6/10
Keywords
heat-protective covering, cathode-ray and magnetron drawing, thermocyclic durability, thermal diffusivity, thermal conductivity, heat capacity, method of laser flash, thermal resistance.
Abstract

On the basis of results of measurement of thermal diffusivity the method of laser flash with the temperature range from 20 to 1100°C multilayer heat-protective coatings received by thermal spraying dusting has establishes essential increase (from 40 to 50%) efficiency of heat-protective properties of coverings of having two ceramic layers: one – ZrO2+7%Y2O3, of other – ZrO2+7%Y2O3+oxides REM in comparison with the heat-protective coverings having one ceramic layer of – ZrO2+7%Y2O3. The same effect is observed on the coverings having one ceramic layer of ZrO2+7%Y2O3 of bigger thickness, alloyed by ytterbium and gadolinium oxides. Thermal conductivity of ceramic layer of ZrO2+7%Y2O3 made on technologies of atmospheriс plasma spraying, equal 1,5 W/(m·K) and is determined by technology of the magnetron drawing, equal 2,4 W/(m·K).

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