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Thermal shock and thermal fatigue resistance of Al 2 O 3 /(W, Ti)C/TiN/Mo/Ni multidimensional graded ceramics
Author(s) -
Ni Xiuying,
Zhao Jun,
Gong Feng,
Li Gang
Publication year - 2021
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/ijac.13704
Subject(s) - materials science , thermal shock , ceramic , scanning electron microscope , composite material , tin , fracture toughness , flexural strength , toughness , residual stress , homogeneous , sintering , shock (circulatory) , quenching (fluorescence) , metallurgy , optics , medicine , physics , fluorescence , thermodynamics
Al 2 O 3 /(W, Ti)C/TiN/Mo/Ni multidimensional graded ceramics and homogeneous reference ceramic were prepared by two step hot press sintering. The thermal shock and thermal fatigue resistance of the multidimensional graded ceramics were tested using the water quenching method. Scanning electron microscopy (SEM) and optical microscope were used to investigate microscopic failure mechanism of ceramics. The results showed that the retained flexural strength of two‐dimensional and one‐dimensional graded ceramics was almost same, but higher than that of the homogeneous ceramic. The crack growth (∆c) of homogeneous ceramic increased rapidly, while that of two‐dimensional graded ceramics is the lowest. Hence, thermal fatigue resistance of the two‐dimensional graded ceramics was highest. The residual compressive stress in the first layer induced by the optimal graded structure played an important role. In addition, the increasing toughness on the crack propagation path by adding different amounts of metals was also a contributing factor.