Nature diamond cutters are important tools to manufacture high precision optics glasses, and it is a normal method to
make such cutter that soldering diamond grain with titanium coating on tool base. However, surface characteristics of
titanium coating determine how much force that diamond grain joined with tool base. This paper introduces the research
of surface characteristics of titanium coating on diamond grain based on AFM which uses its contacting mode to get
measuring data of surface topography. Firstly, the measuring data are analyzed using 2D power spectrum algorithm to
obtain spectrum energy distribution about spatial frequency. Fractal dimension is then calculated from the radius
spectrum, and surface characteristics of titanium coating are evaluated using stationary wavelet transform where feature
separation thresholds takes as an important role based on the fractal dimension. Coating experiments show that such
method can reveal quality information of titanium coating on diamond grain comprehensively and thoroughly, thus it can
offer good experimental reference to optimizing titanium coating parameters.
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