Residual stresses’ magnitude generated by deposition, quenching stress, thermal stress operation temperature, and infiltration in the barrier coating (TBC) of gas turbines was determined. A manufactured deposition two layers, CoNiCrAlY yttria-stabilized zirconia (YSZ), on an AISI 304 stainless steel substrate. The deposited using HVOF gun YSZ atmospheric plasma spray (APS). TBCs were heat-treat...

This paper studied the combined influences of hot streak and swirl on cooling performances NASA C3X guide vane coated with or without thermal barrier coatings (TBCs). The results show that: (1) Even under uniform velocity inlet conditions, core can be stretched as it impinges leading edge which causes higher heat load suction side forward portion. (2) significantly affects circumferential radia...

The development of vertical cracks in air plasma sprayed (APS) thermal barrier coatings (TBCs) during cycling and constrained sintering under a temperature gradient is investigated. Microstructural analysis shows that the associated with multiple processes, including hold period cleavage cooldown. Inspired by experimental observations, an image-based model used to simulate as coating sinters wh...

Rare-earth zirconates are proven to be very effective in restricting the CMAS attack against thermal barrier coatings (TBCs) by forming quick crystalline reaction products that seal porosity infiltration. The microstructural effects on efficacy of Electron Beam-Physical Vapor Deposition gadolinium zirconate (EB-PVD GZO) explored this study. Four distinct GZO microstructures were manufactured an...

This paper deals with the morphology, constitutive phases and fine microstructures of some EBPVD processed yttria partially stabilized zirconia thermal barrier coatings. This study has been performed by X-ray diffraction and scanning and transmission electron microscopy. It was shown that the coatings studied were constituted of a single metastable tetragonal t' phase, as expected if one refers...

Abstract The high-entropy rare-earth zirconate ((La 0.2 Nd Sm Gd Yb ) 2 Zr O 7 , 5RE HEREZs) ceramics were successfully prepared by a new high-speed positive grinding strategy combined with solid-state reaction method. microstructure, crystal structure, phase composition, and thermophysical mechanical properties of the samples systematically investigated through various methods. Results indicat...

Thick thermal barrier coatings (TBCs) have a significant potential to increase efficiency by reducing heat transfer losses. However, in conventional combustion modes, the drawbacks associated with charge heating and higher propensity knock outweighed benefits. Since advanced low-temperature (LTC) concepts are fundamentally different from these penalties do not exist most of LTCs. The current ex...

The work applies topology optimisation to the design of functionally graded materials (FGMs) and materialinterfaces for thermomechanical problems. It is well known, that the mismatch in stiffness and thermal expansioncoefficient of two materials give rise to high stresses at the interface. One way to alleviate this is to use the conceptof FGMs [1]. The FGMs are here designed using t...

Multilayer thermal barrier coatings (TBCs) deposited on superalloy turbine blades provide protection from combustion temperatures in excess of 1500 1C. One of the dominant failure modes comprises cracking from undulation growth, or rumpling, of the highly compressed oxide layer that grows between the ceramic top coat and the intermetallic bond coat. In this paper, a mechanistic model providing ...