ВИЗНАЧЕННЯ ВПЛИВУ ТИСКУ (7,5 ГПа) НА КРИСТАЛІЧНУ БУДОВУ КАРБІДУ ВОЛЬФРАМУ, ЩО ВХОДИТЬ ДО СКЛАДУ ТВЕРДОГО СПЛАВУ WC - 6 % Cо
Sintered hard alloys of the WC-Co system are often used as structural elements of high-pressure apparatus. The matrix of the device is usually made of a cemented carbides WC- 6 % Co and pressed into a block of rings under tension. The structure and phase composition of WC-Co cemented carbides consis...
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| Datum: | 2020 |
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| Hauptverfasser: | , , , |
| Format: | Artikel |
| Sprache: | Ukrainian |
| Veröffentlicht: |
Институт сверхтвердых материалов им. В. Н. Бакуля Национальной академии наук Украины
2020
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| Online Zugang: | http://altis-ism.org.ua/index.php/ALTIS/article/view/170 |
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| Назва журналу: | Tooling materials science |
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Tooling materials science| Zusammenfassung: | Sintered hard alloys of the WC-Co system are often used as structural elements of high-pressure apparatus. The matrix of the device is usually made of a cemented carbides WC- 6 % Co and pressed into a block of rings under tension. The structure and phase composition of WC-Co cemented carbides consists of a infusible component (WC) and a metal binder phase (Co). The literature datas that due to the action of high pressures on hard alloys there is an increase in their physical and mechanical properties, which is the result of changes occurring in the carbide and binder phases. Therefore, the study of the effect of high pressure (up to 10 GPa) on the crystal structure of tungsten carbide, which is part of cemented carbides operating under high pressures, is relevant. To determine changes in the crystal lattice of tungsten carbide used the method of X-ray diffraction analysis. As a result of the work it was determined that the use of high pressures (7.5 GPa) in the sintering of green parts of cemented carbides WC-6 % Co in high pressure apparatuses has a smaller effect on the parameters of the crystal lattice of WC carbide than free sintering in vacuum. The use of high-pressure treatment of 7.5 GPa at a temperature of 1700 ºC does not reduce the parameters of the lattice WC, which is part of the cemented carbides WC-6% Co. Changes that occur in the crystal lattice of WC carbide, under free sintering in vacuum, as well as under the action of high pressures due to the occurrence of micro stresses in WC grains, which can be reflected in changes in physical and mechanical characteristics of cemented carbides. |
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