How to sinter cemented carbide in a vacuum furnace?
The general steps for sintering cemented carbide in a vacuum furnace are as follows:
1. **Preparation**:
- Ensure that the equipment of the vacuum furnace is in good condition, and the interior of the furnace is clean and free of debris.
- Select a suitable sintering boat or fixture to ensure that it can withstand high temperatures and is compatible with cemented carbide materials.
- Prepare the required cemented carbide materials and ensure that their composition and particle size meet the requirements.
2. **Charging**:
- Place the cemented carbide materials in the sintering boat or fixture, pay attention to even distribution, and avoid accumulation or overlap.
- Some sintering aids or protective layers can be added to the surface of the material as needed to improve the sintering quality.
3. **Evacuation**:
- Place the boat containing the cemented carbide materials into the vacuum furnace chamber and close the furnace door.
- Start the vacuum system and gradually remove the air in the furnace chamber to achieve the required vacuum degree.
- It is usually necessary to evacuate to a higher vacuum degree to ensure that there is no interference from oxygen and other gases during the sintering process.
4. **Heating**:
- According to the predetermined sintering process curve, gradually increase the temperature of the vacuum furnace.
- The heating rate and holding time need to be optimized according to factors such as the type, shape and size of the cemented carbide material to ensure the sintering quality.
- During the heating process, the changes in temperature and pressure need to be closely monitored to ensure the normal operation of the equipment.
5. **Sintering**:
- When the temperature reaches the predetermined sintering temperature, a certain holding time is maintained to fully sinter the cemented carbide material.
- During the sintering process, the temperature uniformity needs to be controlled to avoid local overheating or overcooling.
- Multiple sintering can be performed as needed to improve the performance of the material.
6. **Cooling**:
- After sintering, the temperature of the vacuum furnace needs to be gradually lowered for cooling.
- The cooling rate also needs to be controlled according to the characteristics of the material to avoid defects such as thermal stress and cracks.
- Natural cooling or forced cooling can be used, depending on the equipment and process requirements.
7. **Out of the furnace**:
- When the temperature drops to room temperature, open the vacuum furnace door and take out the sintered cemented carbide material.
- Inspect and test the sintered material to evaluate its performance and quality.
It should be noted that the specific sintering process parameters and steps may vary depending on the different cemented carbide materials, equipment and process requirements. Before actual operation, it is recommended to refer to relevant process manuals, technical information or consult professional technicians to ensure the smooth progress of the sintering process and the stability of product quality.
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