The studied specimens consist of air plasma sprayed (APS) TBC deposited on disc-shaped substrates of Hastelloy X.
The studied specimens consist of air plasma sprayed (APS) TBC deposited on disc-shaped substrates of Ni-base alloy Hastelloy X.
TBC specimens examined consisted of air plasma sprayed ZrO2 7 wt.% Y2O3, NiCoCrAlY bond coats and Haynes 230 superalloy.
It was accomplished through the following steps: First, a block of specimen was air dried and a hole of 80 mm in depth and 300 mm in diameter was punched in the center of one face of the specimen.
For in situ exposure, the specimens of freshwater air-breathing murrel fish C. punctatus (Bloch; Family: Channidae; Order: Perciformes) and freshwater catfish M. vittatus (Bloch; Family: Bagridae; Order: Siluriformes) were caught from nearby ponds with the help of local fishermen.
The most common fungi identified from culture of air specimens were Aspergillus spp. (91.8%), Penicillium spp., (6%) and Paecilomyces spp. (1.5%).
The compensation method aims to account for the differences in the information recorded by the ESPI when the test is performed with the specimen immersed in PBS instead of air such that one can obtain the same displacement field for specimens in air as that from specimens immersed in water.
Microstructure of air cooled specimen consists of lower bainite with a few amount of lath martensite, whereas a mixture of lath martensite and lower bainite in prior pan-caked austenite grains has also been obtained on water quenching.
Cylindrical specimens were prepared with varied dimensions for each set of test (φ7.5 × 15 cm cylindrical specimens for compressive strength test, φ10 × 15 cm cylindrical specimens for air permeability and electrophoretic test, φ7.5 × 15 cm cylindrical specimens for accelerated neutralization test and φ10 × 10 cm cylindrical specimens for salt immersion test).
The open porosity was also determined from a combination of gravimetric and volumetric analysis), with the apparent volume taken from micro-CT analysis, and the mass of a wet specimen in air and the mass of a specimen after 24 hours in isopropanol taken from gravimetric analysis.
