ОЦІНКА ПОВЕРХНЕВИХ ВЛАСТИВОСТЕЙ ВИСОКОМІЦНИХ СИНТЕТИЧНИХ ШЛІФПОРОШКІВ АЛМАЗУ

• Datum: 2025
• Hauptverfasser: Ільницька, Галина, Діюк, Віталій, Лавріненко, Валерій, Смоквина, Володимир, Петасюк, Григорій, Логінова, Ольга, Соколов, Олександр, Зайцева, Ірина, Тимошенко, Вікторія, Циба, Микола, Горохов, В'ячеслав
• Format: Artikel
• Sprache: Ukrainisch
• Veröffentlicht: Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины 2025
• Schlagworte: шліфпорошки синтетичних алмазів; міцність; магнітна сприйнятливість; структурно-сорбційні властивості поверхні алмазних порошків; гідрофільність; екстраполяційно-аналітичний метод визначення питомої поверхні.
• Online Zugang: http://altis-ism.org.ua/index.php/ALTIS/article/view/432
• Назва журналу: Tooling materials science

At the present stage of development of advanced technologies for processing tool and composite materials, mechanical engineering requires the use of an efficient diamond tool - dressing rollers equipped with diamond grinding powders. The performance of such a tool depends to a large extent on the quality of diamond powders, so powders of natural diamonds of increased strength and grain size or high-strength synthetic diamond powders of grades AC200 – AC400 are usually used to manufacture dressing tools. The aim of this study was to comprehensively investigate the physical, mechanical, and physicochemical characteristics of high-strength synthetic diamond powders of grades AC300 – AC200 with grit sizes 630/500 and 500/400. For each individual grade, the properties of diamond powders were determined according to the methods developed at the Institute of Superhard Materials of the National Academy of Sciences: strength and uniformity, specific magnetic susceptibility, and hydrophilicity. The appearance of diamond grinding powders of different grits was studied using an Axioscope 5 optical microscope (Carl Zeiss Microscopy GmbH, Germany). The structural and sorption properties of the surface of diamond grinding powders were studied by the classical method of gas adsorption at low temperatures in accordance with the BET principle using a gas adsorption analyzer NOVA 2200 (Quantachrome, USA) and Accusorb 2100 (Cultronics), which are designed to measure porosity, specific surface area, and pore radius. The specific surface area of the samples was also determined by the extrapolation-analytical method. The initial data for its implementation were the results of diagnosing the dimensional and geometric characteristics of the powder, in particular, the length and width of the grain projection, its area and perimeter, using the DiaInspect.OSM device from VOLLSTÄDT DIMANT Gmb (Germany). The experimental results of adsorption studies show that synthetic diamond samples are characterised by a small specific surface area of 0.17 to 0.21 m2/g and a small pore volume of 1.88-1.99 ×10-4 for diamonds of 630/500 grit of grades AC300-AC200 and 1.75 ×10-4 ml/g for diamonds of 500/400 grit of grade AC250. The value of surface hydrophilicity of diamonds of AC200 grade with 630/500 grit is approximately 2.7 times higher than that of diamonds of AC300 grade. For diamonds of the AC250 grade, the 630/500 grit is approximately 1.3 times higher than for diamonds of the 500/400 grit. The values of the specific surface area of the studied samples calculated by the extrapolation-analytical method were significantly lower than those obtained by the experimental method. This can be explained by the inability to take into account the influence of the contribution of functional surface groups on the specific surface area in the calculations. It is also shown that the method of low-temperature nitrogen adsorption-desorption can be used to determine the relative concentration of defects and predict the physical and mechanical properties of crystalline diamond powders of micron size.