A new scratch test method for measuring adhesion of extremely hard coatings with a disposable 1 mm hard ball
Evaluating adhesion of extremely hard coatings using scratch test can be challenging due to their extreme hardness which leads to damage of the diamond indenter. This application report presents an alternative method for such measurements using disposable ceramic balls.
Diamond-based, SiC, WC-based and other extremely hard coatings are highly valued for their excellent friction, wear and chemical properties. Typically deposited using Chemical Vapor Deposition (CVD) techniques, these coatings offer a unique combination of high hardness, excellent adhesion, low friction coefficients, and strong resistance to chemical degradation. These characteristics make them especially suitable for industrial applications demanding high durability and performance, such as power generation and chemical processing. By enhancing the surface properties, they contribute to extended product lifetime, reduced maintenance, and improved overall efficiency of mechanical systems.
Given the crucial role these coatings play in such application, accurately evaluating their adhesion is essential. However, their extreme hardness presents significant challenges for conventional scratch testing techniques, as it leads to premature indenter wear, inconsistent results, and elevated test costs. This application report demonstrates how scratch test with disposable Si₃N₄ balls using the RST 300 Scratch Tester provides an effective and reliable solution for evaluating the adhesion of these ultra-hard coatings.
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