ПІДВИЩЕННЯ ОДНОРІДНОСТІ ЗА ХАРАКТЕРИСТИКАМИ МІЦНОСТІ ШЛІФПОРОШКІВ АЛМАЗУ, ДЛЯ ПІДВИЩЕННЯ ЕФЕКТИВНОСТІ РОБОТИ ПРАВЛЯЧОГО ІНСТРУМЕНТУ

• Datum: 2022
• Hauptverfasser: Пріхна, Т. О., Ільницька, Г. Д., Лавріненко, В. І., Логінова, О. Б., Соколов, О. М., Зайцева, І. М., Смоквина, В. В., Закора, А. П.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины 2022
• Schlagworte: фізико-механічні та експлуатаційні характеристики синтетичних алмазів; однорідність шліфпорошків алмазу за міцністю і за лінійними розмірами; розділення за величиною дефектності поверхні; зносостійкість правлячого інструменту.
• Online Zugang: http://altis-ism.org.ua/index.php/ALTIS/article/view/212
• Назва журналу: Tooling materials science

The physical-mechanical and operational characteristics of synthetic diamonds obtained in the Fe–Co–C growth system are considered. The conducted studies have shown that the heat treatment of diamonds, at a temperature of 0.8 of the melting point of the carbon solvent alloy, allows to increase the number of electrically conductive metal particles that adhere to the surface of diamond crystals and, as a result, increase the selectivity of separation by 10–20% and increase the coefficient of uniformity in strength by at least 10 %. It was found that the preliminary heat treatment of diamond grains before sorting AC100 grade diamonds with a grain size of 315/250 increases the yield of diamond grinding powders with high strength of the AC125 grade and higher by approximately 1.4 times and reduces the yield with low strength (AC65 grade) by 7 %, which increases the uniformity in strength. Based on the conducted research, a technology has been developed that makes it possible to obtain heat-resistant diamond grinding powders with high uniformity in strength and linear dimensions. It is shown that when separating diamond grinding powders of the AC200 grade with a grain size of 500/400 according to the developed technology, powders are obtained that differ in the value of the surface activity coefficient from 0.03 to 0.29%, the strength index under static compression of diamond grains decreases by 1.9 times. The content of impurities in the form of a non-combustible residue (n/r) in 1 product in comparison with the initial powder is reduced by almost 2 times, which contributes to an increase in the thermal stability of diamonds of the 1st product in comparison with the initial powder by 13 %. In terms of the coefficient of uniformity in strength, diamond grinding powders differ in comparison with the original powders by about 1.50–1.25 times, in terms of the coefficient of uniformity in linear dimensions – 1.35–1.14 times. According to the test results, diamond grinding powders of 500/400 grain size isolated in the 1st product with high strength of 469.0 N, thermostability (CTS = 96 %), uniformity in strength (Cun.str. = 79%) and linear dimensions (Cun.l.d. = 80%), corresponding to the elite brand of diamonds AC250-E showed the highest wear resistance. The specific consumption was 4.5 mg/kg, which is approximately 1.5 times lower than the specific consumption of the original AC200 grinding powders.