Vacuum Nitrogen Protection Annealing Furnace

. Product Overview

Our Vacuum Nitrogen Protection Annealing Furnaces offer a high-performance, cost-effective solution for the bright annealing of soft magnetic materials. By utilizing a “Vacuum Purge + Nitrogen Fill” process, this furnace effectively eliminates oxygen to prevent oxidation without the need for expensive argon gas or ultra-high vacuum systems. It is the ideal choice for stress-relieving nanocrystalline cores, amorphous ribbons, silicon steel laminations, and magnetic shielding sheets, ensuring superior magnetic properties with a clean, bright finish.

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3. Key Features & Benefits

• Efficient Oxygen Removal: Pre-vacuum purging removes air and moisture from the chamber, ensuring a high-purity Nitrogen environment that prevents surface discoloration.

• Low Operating Costs: Optimized for Nitrogen use only—eliminating the high cost of Argon—while maintaining excellent surface quality for bulk production.

• Superior Temperature Uniformity: Multi-zone heating and precise PID control maintain a tight tolerance of ± 3 °C, ensuring consistent magnetic performance throughout the load.

• Bright Surface Finishing: Produces “Bright Annealed” parts, eliminating the need for post-process pickling or cleaning for silicon steel and nanocrystalline sheets.

• High-Volume Convection (Optional): Available with nitrogen circulation fans to speed up heating and cooling cycles, increasing overall throughput.

• Robust Vacuum Integrity: Features high-quality vacuum valves and reliable sealing technology, designed for thousands of cycles in industrial environments.

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4. Technical Specifications

Focused on practical industrial parameters.

Feature	Specification
Atmosphere Protection	Nitrogen
Vacuum Purge Level
Max Operating Temp	650°C (Optimized for Magnetic Materials)
Temperature Uniformity	±3°C
Heating Elements	High-Quality Ni-Cr Alloy or Fe-Cr-Al
Pressure Control	Micro-positive pressure protection

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5. Typical Applications

• Nanocrystalline Cores: Large-scale stress-relief for common mode chokes and power transformers.

• Silicon Steel Laminations: Precision annealing of motor stators and E-I transformer cores to restore magnetic flux.

• Amorphous Shielding Sheets: Ideal for the heat treatment of wireless charging modules and EMI shielding materials.

• Magnetic Components: Bright annealing of various soft magnetic alloys used in sensors and relays.

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6. Why Choose Our Nitrogen Vacuum Solution?

• Optimized for Mass Production: Balanced performance and price, making it the most popular choice for magnetics manufacturers.

• Proven Thermal Profiles: We provide pre-set heating and cooling curves specifically tailored for Nanocrystalline and Silicon Steel to maximize permeability.

• Safety First: Integrated nitrogen pressure monitoring and safety release valves ensure stable operation 24/7.

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7. FAQ

Q: Can I achieve a bright finish using only Nitrogen?

A: Yes. By using our vacuum-purge method to remove oxygen before introducing high-purity Nitrogen, we create a stable protective environment that prevents oxidation. This results in a “bright” finish for silicon steel and nanocrystalline cores at a fraction of the cost of argon-based processes.

Q: Is this furnace suitable for stress-relieving silicon steel?

A: Absolutely. After punching, silicon steel requires annealing to recover its magnetic properties. Our furnace provides the precise temperature control needed to eliminate stress without creating the oxide scales found in traditional atmospheric furnaces.