Assessment of aluminide coating integrity by using acoustic emission

Coatings are essential for protecting high-temperature components in aerospace and power generation industries.This study evaluates the integrity of aluminide coatings on MAR-M247, a nickelbased superalloy, under uniaxial tensile loading using acoustic emission (AE).Aluminide coatings, deposited via chemical vapor deposition (CVD), provide oxidation and corrosion resistance but are prone to damage under operational stresses.AE monitoring, a nondestructive evaluation method, detects transient elastic waves associated with damage events such as crack initiation and delamination.By analyzing AE signal characteristics like amplitude and energy, this research identifies acoustic signatures indicative of coating degradation.The findings highlight AE's potential for real-time damage assessment, enabling early detection and predictive maintenance strategies in high-temperature applications.