СТРУКТУРА КАРБіДОТИТАНОВИХ ТВЕРДИХ СПЛАВІВ, ЩО ОТРИМАНО ЕЛЕКТРОРОЗРЯДНИМ СИНТЕЗОМ
The regularities of the formation of titanium carbide hard metals structure by the method of spark-plasma sintering of the powder mixture, obtained as a result of high-voltage electrical discharge processing of the initial iron-titanium powder mixture in a hydrocarbon liquid, are considered. The eff...
Збережено в:
| Дата: | 2019 |
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| Автори: | , , |
| Формат: | Стаття |
| Мова: | Russian |
| Опубліковано: |
Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины
2019
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| Теми: | |
| Онлайн доступ: | http://altis-ism.org.ua/index.php/ALTIS/article/view/114 |
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| Назва журналу: | Tooling materials science |
Репозитарії
Tooling materials science| Резюме: | The regularities of the formation of titanium carbide hard metals structure by the method of spark-plasma sintering of the powder mixture, obtained as a result of high-voltage electrical discharge processing of the initial iron-titanium powder mixture in a hydrocarbon liquid, are considered. The effectiveness of the use of high-energy methods of electric-discharge synthesis for influencing the structure of the material was confirmed. The development of the principle of two stages materials synthesis was received. At the first stage, the surface preparation of titanium and iron powders, the synthesis of nanocarbon of various allotropic modifications and the synthesis of titanium carbide at high-voltage electrical discharge processing with specific energy from 4.5 to 27 MJ/kg take place. At the second stage, during spark-plasma sintering at the temperature of from 1000 to 1100 °C, with a dwell time of up to 20 minutes, a synthesis of titanium carbide hard metals with high physical and mechanical characteristics occurs. The study of the microstructure by the methods of optical and electron microscopy and X-ray phase analysis made it possible to reveal the features of the formation of the hard metals structure using the two-stage approach, which determine their properties. The appearance and increase in the number of hardening titanium carbide and intermetallic phases in a compact are shown, as well as a decrease in porosity of compact with an increase in the specific energy of powder batch processing from 4.5 to 18 MJ/kg and the formation of free carbon with an increase in energy to 27 MJ/kg.
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