The Microstructure and Performance of Metal Based Abradable Sealing Coatings Based on Peeling Medium Particle Structure Design

Abstract

To address the issue of inadequate abradability in existing metal-based coatings, which fall short of meeting the demands of harsh operational conditions, this article introduces the design of two novel metal-based abradable sealing coating materials. These materials are founded on the unique particle structure of the “peeling medium”. The article delves into the fundamental properties and performance under simulated working conditions of these coatings. The “peeling medium” structure refers to the powder structure design, where lubricating phases such as hBN are uniformly coated around metal particles. The experimental conditions under which the coatings were tested included a 1000-hour heat exposure test at high-temperatures. This rigorous testing regime was designed to assess the coatings’ durability and performance under long-term, high-temperature service environments. The primary results of the research revealed that both coatings maintained impressive hardness, bonding strength, and abradability after the heat exposure test. Crucially, these coatings were observed to fracture precisely at the exposed abradable components, demonstrating their ability to maintain the required abradability and excellent thermal stability. The “peeling medium” particle structure design ensures that the coatings can fracture in a controlled manner, preserving their functionality and durability in harsh environments.