Graphite Fixture for NdFeB Magnet Vacuum Sintering
Product Overview
Our precision graphite fixtures and trays are designed for vacuum sintering and heat treatment of neodymium iron boron (NdFeB) permanent magnets. Made from high-density isostatic graphite, these sintering fixtures provide excellent thermal conductivity, dimensional stability, and corrosion resistance during the demanding vacuum sintering process at 1050-1100°C.
We manufacture graphite sintering trays, boats, and fixtures for all major NdFeB magnet production lines. Our graphite tooling ensures uniform heating, minimal part deformation, and clean separation of sintered magnets. Custom sizes and multi-cavity designs available for high-volume magnet manufacturing.
Key Features
- High density graphite for long service life
- Excellent thermal conductivity for uniform sintering
- Corrosion resistant to neodymium and rare earth vapors
- Dimensional stability at sintering temperatures
- Non-reactive with NdFeB alloys
- Various tray and boat designs available
- Custom multi-level fixtures for high throughput
- Replacement parts for all major vacuum furnace brands
Technical Specifications
| Parameter | Specification |
|---|---|
| Material | High density isostatic graphite |
| Density | 1.82-1.86 g/cm³ |
| Flexural Strength | 45-55 MPa |
| Max Temperature | 1150°C (vacuum sintering) |
| Standard Tray Size | 300x300mm, 400x400mm (custom) |
| Thickness | 5mm to 15mm |
| Flatness | ≤0.1 mm per 100mm |
| Machining Tolerance | ±0.1 mm |
Applications
- NdFeB permanent magnet vacuum sintering
- Sintered magnet heat treatment and aging
- Bonded magnet curing processes
- SmCo magnet sintering
- Vacuum degassing of magnetic materials
- Magnet production lines for automotive and electronics
Why Choose Jincheng Graphite?
- Specialized in magnet production graphite tooling
- High-density graphite for extended fixture life
- Corrosion-resistant formulation for rare earth vapors
- Custom tray and fixture designs for your furnace
- Competitive pricing for magnet manufacturers
- Fast delivery for production maintenance
- Replacement trays for all major furnace brands
- Quality consistency from batch to batch
FAQ
Q: How long do graphite sintering trays last in NdFeB production?
A: Typical service life is 30-100 sintering cycles depending on temperature, part loading, and vacuum level. Trays can be re-surfaced (machined flat) multiple times to extend usable life.
Q: Can you produce custom multi-level sintering fixtures?
A: Yes, we design and manufacture complete graphite sintering sets including bottom plates, support posts, separator plates, and loading frames. Our fixtures are optimized for your specific magnet sizes and furnace dimensions.
Q: Do your graphite trays require special coating for NdFeB sintering?
A: Our standard high-density graphite works well for most NdFeB sintering applications. For special grades or extended life, we recommend optional boron nitride (BN) coating or SiC coating to further improve performance and tray life.
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