Abstract
WC-Co cermets are among the advanced engineering materials that are special
properties. This study aimed to determine the optimal amount of carbon in raw materials and industrial production of WC-8Co cermet powder from metal oxides WO3, Co3O4, and activated carbon by solid carbothermic reduction method in situ and under a hydrogen gas atmosphere. The main challenge, in this case, is the incomplete formation of tungsten carbide and the fact that tungsten remains free in the mixture of materials. The raw materials were
homogenized in 5 different ratios with different amounts of activated carbon as the main variable in a mixer for 3 hours. The powder samples were then subjected to carbothermic reduction at 1200o C for 3 h at a heating rate of 10 o
C.min·¹ and subjected to a hydrogen atmosphere at a pressure of 1 atmosphere. According to the results a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), and X-ray diffraction pattern (XRD) sample with the combination (10.108gr WO3, 10.90gr Co3O4, and 58.62gr C) show the best conditions in terms of the obtained phases. Results of scanning
electron microscope image also confirm this and the average number of composite particles, in this case, is about 100 microns.
properties. This study aimed to determine the optimal amount of carbon in raw materials and industrial production of WC-8Co cermet powder from metal oxides WO3, Co3O4, and activated carbon by solid carbothermic reduction method in situ and under a hydrogen gas atmosphere. The main challenge, in this case, is the incomplete formation of tungsten carbide and the fact that tungsten remains free in the mixture of materials. The raw materials were
homogenized in 5 different ratios with different amounts of activated carbon as the main variable in a mixer for 3 hours. The powder samples were then subjected to carbothermic reduction at 1200o C for 3 h at a heating rate of 10 o
C.min·¹ and subjected to a hydrogen atmosphere at a pressure of 1 atmosphere. According to the results a scanning electron microscope (SEM) equipped with an energy dispersive spectrometer (EDS), and X-ray diffraction pattern (XRD) sample with the combination (10.108gr WO3, 10.90gr Co3O4, and 58.62gr C) show the best conditions in terms of the obtained phases. Results of scanning
electron microscope image also confirm this and the average number of composite particles, in this case, is about 100 microns.
| Translated title of the contribution | Synthesis of WC-8Co cermet powder in WO3-Co3O4-C system by in situ carbothermic solid reduction method under hydrogen atmosphere |
|---|---|
| Original language | Persian (Iran, Islamic Republic of) |
| Pages (from-to) | 41-54 |
| Journal | Iranian Journal of Ceramic Science & Engineering |
| Volume | 11 |
| Issue number | 3 |
| DOIs | |
| Publication status | Published - 2022 |
| Externally published | Yes |
Keywords
- WC-Co cermet
- Carbothermic in situ reduction
- Phase analysis
- Microstructural analysis,
- Thermodynamic analysis