Application of lifting bell jar furnace in powder metallurgy industry

In the powder metallurgy industry, the lifting bell jar furnace is mainly used for sintering powder pressed billets, vacuum sintering of refractory metals and hard alloys, powder baking and pretreatment, as well as small-scale experimental sintering of new materials, as follows:

1. Sintering of powder pressed blanks
Application scenario: The lifting bell jar furnace is suitable for sintering powder metallurgy pressed billets (such as iron-based, copper based, alloy steel, etc.), especially for sintering heavy or large products.
Advantage:
Flexible temperature control: Ensure uniform temperature inside the furnace through three-stage temperature control (upper, middle, and lower) to avoid cracking or deformation of the billet due to temperature differences.
Protective atmosphere: Hydrogen, nitrogen and other protective gases can be introduced to prevent billet oxidation and improve sintering quality.
Intermittent operation: suitable for small batch and multi variety production, meeting customized needs.

2. Vacuum sintering of refractory metals and hard alloys
Application scenarios: Used for sintering refractory metals such as tungsten, molybdenum, tantalum, as well as hard alloys (such as tungsten cobalt alloys).
Process characteristics:
Vacuum environment: Sintering under vacuum or inert gas protection to prevent metal oxidation and improve material purity.
Current assisted heating: Complete sintering is achieved by passing current through both ends, promoting liquid phase flow and increasing density.
High temperature stability: The working temperature can reach above 1650 ℃, meeting the sintering requirements of refractory metals.

3. Powder baking and pretreatment
Application scenario: In the pre process of powder metallurgy, it is used to bake ceramic or alloy powders and remove volatile components (such as sulfur, lead, zinc, etc.).
Function:
Pre oxidation treatment: enhances powder activity, optimizes subsequent molding and sintering processes.
Reduce impurities: prevent volatile components from corroding the furnace and heating elements during sintering, and extend equipment life.

4. Small batch experimental sintering of new materials
Application scenarios: Support the research and development of new materials and technologies, such as metal matrix composites, gradient functional materials, etc.
Advantage:
Flexible testing: adjustable parameters such as temperature, atmosphere, and time can be used to verify the feasibility of the process.
Low cost trial production: Avoiding large-scale production risks and reducing research and development costs.
Multi atmosphere support: Different atmospheres (such as reducing and inert) can be introduced separately to meet special material requirements.

5. Sintering of special materials
Application scenarios: Used for sintering active metals (such as zirconium, hafnium), titanium based composite materials, etc.
Process requirements:
High purity atmosphere: prevents materials from reacting with oxygen, hydrogen, etc., ensuring stable performance.
Precise temperature control: Optimize material structure, enhance high-temperature strength and corrosion resistance.

6. Annealing and stress relief treatment
Application scenario: Annealing of metal and alloy materials to improve microstructure and eliminate internal stress.
Function:
Improve plasticity: reduce hardness, facilitate subsequent processing.
Stability performance: reduces the risk of deformation or cracking of materials during use.