The thermal shock resistance of alumina ceramics with a fine-crystalline structure (crystal size 5 – 40 μm) and with a layered-granular structure, as well as t-ZrO2–Cr(40 vol. %) cermet, was studied. Layered-granular ceramics consisted of randomly oriented layered granules, including alternating dense fine-crystalline layers and porous layers made of corundum microballoons. The cermet structure is represented by two interpenetrating continuous skeletons formed from chromium grains and t-ZrO2 grains. To assess the thermal shock resistance, in addition to the known criteria R0, R1 it is proposed to use new criteria R0*, R1* and the kinetic characteristic of fracture γF/γI. These criteria were compared with the thermal shock resistance determined by the number of thermal cycles to failure N of samples and by the method of local thermal shock, which determines the relative loss of crack resistance of the sample after a single thermal cycle RT. Layered-granular Al2O3-ceramics exhibit the best thermal shock resistance due to the discrete and high-energy destruction mechanism. The use of chromium in the composition of cermet made it possible to significantly increase its thermal shock resistance in comparison with the thermal shock resistance of the ceramic component due to the presence of a heat-conducting metal component. It is shown that the application of the new criteria R0* and R1* makes it possible to reliably predict the thermal shock resistance of the studied materials from the indicators N and RT.
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The research was carried out within the framework of the basic part of the state assignment to universities No. 11.7568.2017/B4 using the equipment of the resource center for collective use “Aviation and Space Materials and Technologies” of MAI.
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Translated from Novye Ogneupory, No. 12, pp. 29 – 37, December 2020.
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Ivanov, D.A. Application of the Thermal Shock Resistance Criteria for Evaluating the Fracture Resistance Under Thermal Stress of Alumina Ceramics and t-ZrO2–Cr Cermet. Refract Ind Ceram 61, 695–703 (2021). https://doi.org/10.1007/s11148-021-00545-0
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DOI: https://doi.org/10.1007/s11148-021-00545-0