Determining the Thickness Coating of Grinding Powders of Synthetic Diamond Based on a Specific-Surface Approach and using an Extrapolation-Affine 3D Model of Grain

Abstract

: Methodological features of indirect determining of thickness coating of grains grinding powders of synthetic diamond are analyzed. A newly revised classification of known methods for determining the thickness of the coating is proposed. The prospects of the methods based on the application of an external specific surface are noted. A positive feature is the proposal to determine the thickness of the coating separately for each grain of the sample, followed by the generalization of the results by calculating the arithmetic mean. This calculation scheme allows you to get more reliable information about the thickness of the coating. The expediency of using an extrapolation-affine 3D grain model in such a calculation scheme is substantiated. Using the extrapolation-affininе 3D grain model allows for determining the thickness of the coating of diamond powder grains without the traditional assumption about the spherical shape of their grains and with less error. For an example of grinding powder AC125 400/315, the advantage of such a 3D model compared to a 3D model in the form of a sphere is proved. The method proposed on the basis of such methodical innovation can be used for powders of other abrasive materials.

Pycnometric-Additive Determining of the Degree of Coating of High-Strength Synthetic Diamond Grinding Powders using the Actual 3D Morphology of their Grains

“…An extrapolation-affinity 3D model of the spatialgeometric shape of the grinding powder grain of the initial and after applying the coating is taken. Well-known studies [22] have proven that the extrapolation-affinity 3D model [35] is the most adequate in terms of determining the average value of the grain volume of SHM powders. Based on this, the average values of the volumes of the grains of grinding powders of the initial and with a coating applied to the surface of its grains are found, and the degree of coating (µ) is calculated according to dependence (2).…”

“…In addition, the degree of coating have an independent value, as an important methodical component of the indirect-analytical determining of the thickness of the coating. This is due to the fact that the degree of coating is included in the list of initial data required when determining the thickness of the coating by known indirect analytical methods [19,20,[22][23][24][25][26].…”