ABSTRACT
A new method used to evaluate the adhesion characteristics of diamond coatings on carbide inserts was introduced by Schneider et al. [37]. In this method, a sandblast erosion test was conducted on the coating-carbide system. The criterion for adhesion evaluation was the time required to cause detachment of the diamond coating in the blast spot area near the cutting edge. The critical time was termed the critical blasting time by Schneider et al. [37]. The blasting test was conducted using 9 0 -1 2 5 μτη sized alumina particles (AI2O3) with a dynamic blasting pressure of 0.4 MPa and a nozzle diameter of 0.8 mm. Since the size of these particles was ten to twenty times larger than the coating thickness, fatigue was expected to occur within the substrate as well. The results of applying the blasting test indicated that the relative qualitative adhesion depended on the substrate pretreatment method and diamond coating thickness. The critical blasting time under the listed conditions ranged from 2 seconds to 130 seconds.
