custom sintered carbide wear parts
Product Attributes Name: sintered tungsten carbide parts, Grade: K10, K20, K30, yg6, yg8 Origin: China Main Metal Content: 99.9% Impurity Content: 0.1% Particle Size: 20-40 mesh Machining: sintered, Grinding, CNC, […]
- Info
| Product Attributes | |
| Name: sintered tungsten carbide parts, | Grade: K10, K20, K30, yg6, yg8 |
| Origin: China | Main Metal Content: 99.9% |
| Impurity Content: 0.1% | Particle Size: 20-40 mesh |
| Machining: sintered, Grinding, CNC, Wire EDM, | Customizable: Yes |
| Hardness: 85-95 HRA | Precision: 0.003 mm |
The vacuum sintering process of tungsten carbides is an essential step in ensuring the quality of the product. Here, I shall succinctly delineate its pivotal aspects:
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Influence of Vacuum on Sintering:
Deoxidation: Under conditions of high temperature and vacuum, the reaction between carbon and oxides is more complete, facilitating thorough deoxidation.
Cobalt Loss: With fixed sintering temperatures and durations, an increased vacuum level can lead to greater evaporation losses of cobalt.
Carbon Content Variation: An increased vacuum results in greater carbon loss, particularly under conditions of high oxygen content, exacerbating decarburization.
Temperature and Duration:
Vacuum sintering enhances densification, with degassing typically occurring between 1050-1250°C, maintained for 0.5-1 hour.
The sintering temperature should be slightly above the liquidus temperature to ensure sufficient liquid phase formation, but excessive temperatures or prolonged durations can increase cobalt loss. It is recommended to maintain the temperature 30-100°C above the eutectic temperature for 0.5-1 hour.
Furnace temperatures should be uniform to ensure balanced heat transfer.
Heating Rate:
During the dewaxing (debonding) stage, the temperature should be raised slowly to prevent cracking or delamination, usually within the range of 350-500°C.
After dewaxing, the temperature can be rapidly increased to the deoxidation range (1050-1250°C), then gradually raised to the sintering temperature and maintained for 0.5-1.5 hours.
Cooling Rate:
Options include natural cooling or forced cooling using gases (N2, Ar, He), the latter of which can shorten production cycles and control the composition of material phases, thereby enhancing the binder phase.
The entire sintering process must be strictly controlled to ensure that the final properties of the tungsten carbides meet high standards.
