Abstract
Based on the assumption that the results of a scratch test would not be affected significantly by some degree of variations of the rising rate of normal load and the speed of scratching, a manually operated scratch tester was developed for investigating the adhesion properties of coatings. The system can detect the friction force and normal load generated during a test, and identify the critical normal load Lc where the friction force becomes unstable. Measurements were made on glass, zirconium nitride coatings and aluminum oxide coatings for examining the reliability of the system. Lc of the three samples were 2.0±0.41N, 1.4±0.32N, and 0.52±0.13N. Results show that the system is good enough to serve as an economical replacement for a conventional scratch tester.
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