Abstract
Thermal barrier coating (TBC) system is used in both aero engines and other gas turbines offer oxidation protection to super alloy substrate component. In the present work, it shows the ability of a new fabrication technique to develop rapidly new coating composition and microstructure. The compact powder were prepared by powder metallurgy method involving powder mixing and the bond coat was synthesized through the application of spark plasma sintering (SPS) at 1100°C, 1050°C and 1100°C to produce a fully dense 94%) Ni22Cr11Al bulk samples. The influence of sintering temperature on hardness of Ni22Cr11Al done by micro vickers hardness tester was investigated. And oxidation test were carried out at 1100°C for 20 hr, 40 hr and 100 hr. The resulting coat was characterised with Optical microscopy, Scanning electron microscopy (SEM) and X-ray diffraction (XRD). Micro XRD analysis after the oxidation test revealed the formation of protective oxides and non-protective oxides.
Highlights
In order to meet the challenging rising cost of high performance materials used for components operating at elevated temperature in aeroengines and other gas turbines, surface modification and techniques have attracted the attension of investigators globally [1,2]
It has been proposed that these mechanism is facilitated mainly by the stress state arising from the residual compression in the thermally grown oxide (TGO) formed in service on bond coat which is the Al reservoir promoting α- alumina to form in preference to oxides [11,12,13]
Scanning electron microscopy (SEM) micrographs of the mixed powder particles are represented in Figure 2, Mechanical mixing of the new material occurs, while there were still some regions which still consisted of one phase
Summary
In order to meet the challenging rising cost of high performance materials used for components operating at elevated temperature in aeroengines and other gas turbines, surface modification and techniques have attracted the attension of investigators globally [1,2]. Application of TBC at elevated temperature gives rise to transfer of oxygen from the topcoat into the bond coat, so that an oxidized scale can be formed on the bond coat which is referred to as the thermally grown oxide (TGO) typically alfa-alumina [7,8]. This scale protects the super alloy components from further oxidation, the growth of TGO during thermal exposure leads to failure of the TBC System. In this study a Ni22Cr11Al bond coat were consolidated using spark plasma sintering technique and the high temperature oxidation resistance of the coating has been investigated
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