High-Purity Graphite Heater for Vacuum Furnace
Product Overview
Our high-purity graphite heaters are engineered for use in vacuum and controlled-atmosphere furnaces operating at temperatures up to 3000°C. Manufactured from isostatic-molded high-purity graphite material, these heating elements deliver exceptional thermal conductivity, low thermal expansion, and outstanding resistance to thermal shock. Each heater is precision-machined to customer specifications, ensuring uniform temperature distribution and reliable long-term performance in demanding industrial heat-treatment processes.
Graphite heating elements are the preferred choice for vacuum furnaces because they offer significantly higher power density and faster heating rates compared to metal alloy heaters. With a sublimation point above 3600°C, graphite heaters maintain structural integrity at temperatures where all metallic heating elements have long since melted. At Jincheng Graphite, we produce both standard and custom-configured graphite heaters, including cylindrical, grid, and cantilever designs, tailored to your specific furnace chamber dimensions and thermal profile requirements.
Key Features
- Ultra-high temperature capability - operates continuously up to 3000°C in vacuum or inert atmosphere
- High thermal conductivity - ensures rapid, uniform heat transfer throughout the workload
- Excellent thermal shock resistance - withstands rapid heating and cooling cycles without cracking
- Low ash content - high-purity grade minimizes outgassing and contamination of processed parts
- Low electrical resistance - efficient energy conversion and stable power input at high temperatures
- Precision CNC machined - tight dimensional tolerances for perfect fit in existing furnace housings
- Custom geometries available - cylindrical, conical, grid, strip, and segmented designs to suit any furnace
- Long service life - superior oxidation resistance and mechanical stability extend heater lifetime
Technical Specifications
| Parameter | Value |
|---|---|
| Material Grade | Isostatic high-purity graphite |
| Bulk Density | 1.75 - 1.88 g/cm³ |
| Shore Hardness | 55 - 75 HS |
| Flexural Strength | 40 - 65 MPa |
| Compressive Strength | 70 - 120 MPa |
| Electrical Resistivity | 12 - 18 µΩ·m |
| Thermal Conductivity | 100 - 140 W/(m·K) |
| Coefficient of Thermal Expansion | 2.0 - 3.0 × 10-6/K |
| Ash Content | < 500 ppm (ultra-pure grade < 50 ppm) |
| Max Operating Temperature | 3000°C (vacuum / inert gas) |
| Dimensional Tolerance | ±0.05 mm (CNC machined) |
| Surface Finish | Ra 1.6 - 3.2 µm |
Applications
- Vacuum brazing furnaces - uniform heating for precision aerospace and medical component brazing
- Vacuum sintering furnaces - powder metallurgy carbide and ceramic part sintering
- Graphitization furnaces - high-temperature graphitization of carbon materials and electrodes
- CVD and SiC deposition furnaces - substrate heating in semiconductor and coating processes
- Vacuum annealing and tempering - heat treatment of tool steels, superalloys, and magnetic materials
- Crystal growth furnaces - silicon, sapphire, and SiC single crystal growth at extreme temperatures
Why Choose Jincheng Graphite?
- Over 20 years of graphite machining experience serving global vacuum furnace OEMs and end-users
- In-house material selection - we help you choose the optimal graphite grade for your temperature and atmosphere requirements
- Precision CNC machining with tolerances as tight as ±0.01 mm on complex heater geometries
- Custom design support - our engineering team works from your drawings or reverse-engineers worn heaters
- Fast lead times - standard heaters ship within 7-15 days; custom designs within 25-35 days
- Global shipping - export to 30+ countries with secure export packaging
- Competitive factory pricing - direct from our own workshop in Henan, China
- Quality assurance - dimensional inspection and material certification on every order
FAQ
Q: What is the typical lifetime of a graphite heater in a vacuum furnace?
A: Under normal vacuum or inert-gas operation (10-3 mbar or better), a well-designed graphite heater typically lasts 2-5 years depending on thermal cycling frequency, atmosphere purity, and heater geometry. Oxygen or moisture contamination significantly shortens heater life through oxidation.
Q: Can you replicate a heater from a drawing or a worn sample?
A: Yes. We routinely reverse-engineer worn or broken graphite heaters from samples or engineering drawings. Send us your dimensions, material grade (if known), and sketch, and we will quote a precise replacement.
Q: Do you offer coated graphite heaters for special atmospheres?
A: Yes. We can apply CVD SiC or tantalum carbide (TaC) coatings on graphite heaters for use in oxidizing, corrosive, or contaminant-sensitive environments such as SiC crystal growth and semiconductor CVD processes.
Q: What information do you need to provide a quote?
A: Please send a drawing or sketch showing overall dimensions, cross-section geometry, mounting hole locations, and the required graphite grade. If you are unsure about the grade, describe your furnace model, operating temperature, and atmosphere, and we will recommend the optimal material.
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