Under vacuum or inert atmosphere, by using high-purity graphite under isostatic pressure and properly controlling temperature and thermal cycling, the graphite heater can be used stably for over 10,000 hours, which is 5 to 10 times longer than that of metal heaters (such as molybdenum wire and silicon-molybdenum rods, with a lifespan of 1,000 to 2,000 hours).
| Performance items | Conventional high-purity graphite | High-end isostatic pressed graphite |
|---|---|---|
| Carbon content | ≥99.9% | ≥99.99% |
| Density | 1.75～1.85 g/cm³ | 1.85～1.95 g/cm³ |
| Ash content | ≤0.1% | ≤0.01% |
| Open porosity rate | 10%～15% | 5%～10% |
Material upgrade: Preferentially select isostatic graphite, with ultra-high purity grade (≥99.99%) suitable for precision processes
Atmosphere optimization: Maintain a vacuum degree of 10⁻³Pa or higher in the vacuum furnace, control the dew point <-40℃; Oxidative atmosphere must apply a SiC anti-oxidation coating
Process adjustment: Reduce the heating rate to 5-8℃/min, reduce frequent startups and shutdowns, and avoid short-term over-temperature
Structural optimization: Adopt a multi-stage combined design to distribute power; avoid local overheating areas; reasonably design the connection terminals
Regular maintenance: Check once every 1000 hours, clean the surface, measure the resistance change, and replace damaged components in time
| Performance items | Standard value |
|---|---|
| Room temperature volume resistivity | 8～13 μΩ·m |
| Resistance temperature coefficient | Negative coefficient, high-temperature resistance does not soar |
| Applicable operating voltage | Low-voltage high-current compatible: 380V / Industrial-specific transformer |
| Single branch rated power range | 0.5kW～500kW |
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1. Super high quality: Comprehensive control over every aspect from materials to processes.
2. Core technology fully controllable: Proficient in key processes such as high-temperature graphitization and purification, supporting 72-hour non-standard customization response.
3. Ultimate quality guarantee: High-purity products reach 5N + purity, resistant to 3000℃ high temperature + strong corrosion, with full batch traceable testing.
4. Uninterrupted full-cycle service: Large-scale production + 5-7 days small-batch delivery, 24-hour technical response + on-site support.
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Special graphite heater for vacuum furnaces - Detailed advantages
Compared with metal heaters such as molybdenum and tungsten, they will soften and deform above 1800℃, while the mechanical strength of graphite increases with higher temperature. It is the only reliable heating element for ultra-high temperature vacuum furnaces.
It can achieve precise constant temperature control, ensuring uniform heating of the workpiece, avoiding local overheating or underheating, and significantly improving the yield rate of sintering, annealing, and brazing products.
Compared with metal heaters, it heats up faster under the same power and has better heat preservation effect. It can save 20%-30% energy over the long term and reduce the electricity cost of the factory.
It can withstand rapid temperature rise and rapid cooling cycles without cracking, chipping, or deformation. It is suitable for frequent start-stop and continuous production conditions of vacuum furnaces.
Common Problem
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Life span of vacuum furnace graphite heater: Comprehensive analysis of core data and influencing factors
The service life of the vacuum furnace graphite heater is not a fixed value. It mainly depends on the working conditions, material grade, structural design and maintenance level. The typical range is between 3,000 and 15,000 hours.
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