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Low‐temperature stiffening of air plasma‐sprayed 7 wt% Y 2 O 3 ‐stabilized ZrO 2
Author(s) -
Lal Devi,
Kumar Praveen,
Sampath Sanjay,
Jayaram Vikram
Publication year - 2020
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.16901
Subject(s) - nanoindenter , materials science , composite material , bulk modulus , elastic modulus , modulus , young's modulus , flexural modulus , microstructure , stiffening , bending , flexural strength
Evolution in bending modulus and accompanying microstructure of free‐standing air plasma‐sprayed Y 2 O 3 ‐stabilized ZrO 2 subjected to thermal exposure, from 800°C to 1300°C, has been studied. The bending modulus was measured using custom‐made miniaturized cantilevers, which was loaded using a nanoindenter. Variation in the bending modulus was compared with the density change. The coating shows two domains of behavior of modulus variation with density: the low temperature/time domain wherein the bending modulus doubles without measurable change in the density and the high‐temperature domain where modulus increases monotonically with density. Finite element (FE) analysis was carried out using cross‐sectional micrographs of coatings to measure the elastic modulus of the actual coating and compared with experimentally observed values. The modulus values predicted by FE analysis are 70%‐80% higher than the experimentally observed values. An analytical model has been proposed to corelate the microcracks density and elastic modulus, which is in reasonable agreement with the experimentally measured values.