СПІКАННЯ, ФІЗИКО-ТЕХНІЧНІ ХАРАКТЕРИСТИКИ ТА ДТА-ТГ АНАЛІЗ КАРБІДОВМІСНИХ КОМПОЗИТІВ, ОТРИМАНИХ В СИСТЕМАХ cBN-MeCх-(Al) де Me- Ti, Zr, V, Cr, Ta

• Datum: 2020
• Hauptverfasser: Стратійчук, Д. А., Туркевич, В. З., Сліпченко, К. В., Мельнійчук, Ю. О., Туркевич, Д. В.
• Format: Artikel
• Sprache: Ukrainian
• Veröffentlicht: Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины 2020
• Schlagworte: ДТА-ТГ аналіз; надтверда кераміка; окиснення; термостійкість; cBN; керамо-матричні композити BL- групи
• Online Zugang: http://altis-ism.org.ua/index.php/ALTIS/article/view/173
• Назва журналу: Tooling materials science

Under conditions of high pressures and temperatures for cBN-MeCх-(Al) systems, where Me – Ti, Zr, V, Cr, Tа, the phase formation processes, certain physical and technical as well as thermal characteristics of the obtained superhard ceramic matrix composites have been studied. According to the results of XRD-analysis data, sintering in these systems is leads to the formation of minor amounts borides of d- elements, AlN, Al2O3, and the final sintered ceramics are non-porous with high Young modules (500-600 GPa) at a hardness of up to 43 GPa. All materials obtained can be used as cutting inserts for metal working by cutting. Using the DTA-TG analysis in air in the temperature range of 200-1300 °C, the processes of thermal and chemical destruction of sintered cBN-carbide materials have been analyzed. It has been experimentally established that visible oxidation processes for all superhard composites start at T > 800 °C, are accompanied by exothermic effects and, as a rule, a gain in the total mass of the sample. The oxidation proceeds in two stages, starting with the interaction of d-metal carbide with atmospheric oxygen and further oxidation of cBN grains. Among the reaction products after thermal treatment, B2O3 and the corresponding higher carbide-forming metal oxide have been registered.