Graphite Heater Plate and Heating Board for Sintering Furnace
Product Overview
Our graphite heater plates and heating boards are precision-machined flat graphite elements used as radiant heaters in vacuum and controlled-atmosphere sintering furnaces. Cut from high-purity isostatic graphite, these flat heating elements provide uniform, predictable heat distribution across the work zone. They are available in flat plate, slotted, and grid configurations, designed to fit specific furnace chamber dimensions and electrical power requirements. Heater plates are widely used in ceramic sintering, powder metallurgy, vacuum brazing, and diamond tool sintering furnaces.
Unlike cylindrical or rod heaters, flat graphite heater plates offer broad, uniform radiative heating that is ideal for flat workpieces such as ceramic tiles, diamond tools, and powder metallurgy compacts. At Jincheng Graphite, we machine heater plates to your furnace drawings, including custom slot patterns that control resistance and current distribution. We can also supply complete heater plate assemblies with terminal contacts and mounting hardware for direct furnace installation.
Key Features
- Uniform radiant heating - flat design provides even temperature across the work zone
- Precision slotted - custom slot patterns set electrical resistance and power density
- High purity graphite - low ash for clean vacuum and inert atmosphere operation
- High temperature rating - continuous operation up to 2200°C in vacuum
- Dimensional accuracy - flat plates machined to tight flatness tolerances
- Robust terminal contacts - machined power connection surfaces for reliable electrical contact
- Custom sizes and shapes - rectangular, circular, or slotted plates per furnace design
- Long service life - resistant to thermal cycling and oxidation in controlled atmospheres
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-purity isostatic graphite |
| Bulk Density | 1.78 - 1.88 g/cm³ |
| Ash Content | < 200 ppm |
| Electrical Resistivity | 13 - 18 µΩ·m |
| Flexural Strength | 50 - 65 MPa |
| Max Temperature | 2200°C (vacuum/inert) |
| Plate Thickness | 5 - 30 mm |
| Max Plate Size | 600 × 600 mm |
| Slot Width | 1 - 5 mm (precision machined) |
| Dimensional Tolerance | ±0.1 mm |
| Flatness | < 0.1 mm per 300 mm |
| Resistance Tolerance | ±10% (custom) |
Applications
- Ceramic sintering furnaces - heating plates for alumina, zirconia, and ceramic component sintering
- Powder metallurgy - heater plates for metal powder compaction and sintering
- Diamond tool sintering - flat heaters for diamond segment and blade sintering presses
- Vacuum brazing furnaces - top and bottom plate heaters for uniform brazing temperature
- Glass sealing - flat heating elements for glass-to-metal sealing furnaces
- Electronic ceramic firing - heater plates for ferrite and piezoelectric ceramic sintering
Why Choose Jincheng Graphite?
- Custom slot design - we calculate slot patterns to match your required resistance and power
- Precision machining - CNC-machined slots with tight width and spacing control
- Material consistency - certified resistivity and density for predictable heater performance
- Reverse engineering - we replicate worn heater plates from samples or drawings
- Complete assemblies - supply plates with terminal contacts and mounting hardware
- Fast delivery - standard plates ship within 10-15 business days
- Competitive pricing - factory-direct heater plate manufacturing
- Global supply - serving furnace builders and sintering equipment makers worldwide
FAQ
Q: How do I specify the heater plate resistance?
A: Tell us your furnace voltage, target power, and chamber dimensions. Our engineering team will design the slot pattern to achieve the required resistance and power density. Alternatively, send us a drawing of an existing heater plate and we will replicate it.
Q: Why do graphite heater plates develop hot spots?
A: Hot spots typically result from uneven current distribution due to poor contact at terminals, oxidized or thinned sections, or uneven slot width. We control slot machining to ±0.1 mm and recommend inspecting terminal contacts annually to prevent hot spot formation.
Q: Can you supply matching insulation for the heater plates?
A: Yes. We can supply graphite felt, rigid graphite board insulation, and support posts to install with your heater plates, providing a complete heating zone solution.
Q: What is the expected service life?
A: In a well-maintained vacuum or inert atmosphere furnace, graphite heater plates typically last 2-5 years. Life depends on operating temperature, atmosphere purity, and thermal cycle frequency. We recommend annual inspection of plate thickness and slot integrity.
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