Surface properties of high-strength synthetic diamond abrasive powder
DOI:
https://doi.org/10.15407/hftp16.04.501Keywords:
synthetic diamond grinding powders, strength, magnetic susceptibility, structural and sorption properties of the surface of diamond powders, hydrophilicityAbstract
The current stage of development of progressive technologies for machining machine parts requires the use of effective diamond tools - straightening rollers, which are equipped with diamond grinding powders. The performance of such tools largely depends on the quality of diamond powders, therefore, for the manufacture of straightening tools, natural diamond powders of increased strength and grain size, or high-strength synthetic diamond powders of grades AC200 – AC400 (according to regulatory documents of Ukraine) are usually used. The purpose of this work was to study the physical-mechanical and physical-chemical characteristics of high-strength synthetic diamond grinding powders of grain size 630/500 of grades AC300 – AC200.
For each individual brand, the properties of diamond powders were determined using methods developed at the Institute of Superhard Materials of the National Academy of Sciences: strength and uniformity in strength, specific magnetic susceptibility, and hydrophilicity. The appearance of diamond grinding powders of different grain sizes was studied using an Axioscope 5 optical microscope (Carl Zeiss Microscopy GmbH, Germany).
The study of the structural and sorption properties of the surface of diamond grinding powders was carried out by the volumetric nitrogen adsorption-desorption method at – 196 °C using a Quantachrome NovaWin automatic gas adsorption analyzer (Quantachrome, USA) according to the standard procedure.
Spectrometric studies of synthetic diamond powder samples were performed in the mid-IR range
(4000–700 cm–1) with a resolution of 2 cm–1. A Nicolet 6700 Fourier spectrometer (Thermo Fisher Scientific Inc., USA) was used to record the diffuse reflectance infrared (DRIFT) spectra of the samples.
According to the results of adsorption studies, it is shown that synthetic diamond samples are characterized by a small specific surface area from 0.17 to 0.21 m2/g and a small pore volume (1.88–1.99)?10–4 cm3/g. The studied diamond powders differ in strength by 1.4 times, and the specific magnetic susceptibility of diamond crystals increases from 3.3 to 4.8?10–8 m3/kg with a decrease in their strength, which is associated with an increase in inclusions and impurities in diamond crystals. It is shown that the method of low-temperature nitrogen adsorption-desorption and diffuse reflectance IR spectroscopy can be used to determine the relative concentration of defects and predict the physical and mechanical properties of micron-sized crystalline diamond powders.
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