Graphite Boat and Sagger for Ceramic and Powder Sintering Furnace
Product Overview
Our graphite sintering boats and saggers are box-shaped or trough-shaped graphite containers used to hold ceramic powder, metal powder, and electronic components during high-temperature sintering in vacuum, inert gas, or reducing atmosphere furnaces. Unlike ceramic saggers that crack and spall under thermal shock, graphite boats are light, strong, and can withstand rapid heating and cooling cycles without breaking. We manufacture rectangular, round, and custom-profile graphite boats in sizes from small lab boats (50 mm long) to large production saggers (600 mm long), machined to your exact sintering load requirements.
Sintering boats are consumable products in powder metallurgy, electronic ceramic, and advanced material manufacturing. The boat must not react with the powder being sintered, must maintain flatness and dimensional stability, and must last through hundreds of furnace cycles. At Jincheng Graphite, we design and machine graphite sintering boats from high-density isostatic graphite, with smooth interior surfaces that do not contaminate the sintered powder. We can supply solid boats, boats with covers, and stacked boat configurations for continuous furnace operation.
Key Features
- Thermal shock resistant - withstands rapid heating and cooling without cracking
- Non-reactive - no chemical reaction with ceramic or metal powders
- High density - dense material prevents powder infiltration into the boat wall
- Smooth interior - machined interior for clean powder release
- Custom sizes - from 50 mm lab boats to 600 mm production saggers
- Optional covers - matched graphite lids for atmosphere control
- Stackable - boats designed for stable multi-level stacking
- Lightweight - easy to load and unload from production furnaces
Technical Specifications
| Parameter | Value |
|---|---|
| Material | High-density isostatic graphite |
| Bulk Density | 1.78 - 1.88 g/cm³ |
| Flexural Strength | 50 - 65 MPa |
| Operating Temperature | 1400 - 2200°C (vacuum/inert/reducing) |
| Length Range | 50 mm - 600 mm |
| Width Range | 30 mm - 300 mm |
| Wall Thickness | 5 mm - 15 mm |
| Bottom Thickness | 8 mm - 20 mm |
| Interior Finish | Ra 1.6 µm (smooth machined) |
| Dimensional Tolerance | ±0.3 mm |
| Service Life | 200 - 500 sintering cycles |
| Lead Time | 10-20 business days |
Applications
- Ceramic powder sintering - boats for alumina, zirconia, and silicon nitride powder
- Metal powder sintering - saggers for PM steel, copper, and stainless powder
- Electronic ceramics - boats for ferrite, piezoelectric, and ceramic capacitor sintering
- Cemented carbide - boats for tungsten carbide and cobalt powder sintering
- Catalyst sintering - boats for catalyst powder high-temperature treatment
- Research and lab - small boats for university and industrial research furnaces
Why Choose Jincheng Graphite?
- Sintering boat expertise - deep understanding of powder sintering requirements
- High density material - dense graphite resists powder infiltration and erosion
- Custom design - boats designed for your furnace and powder geometry
- Precision machining - smooth interior and exact outer dimensions
- Bulk supply - reliable monthly boat supply for production lines
- Competitive pricing - lower than imported graphite saggers
- Fast delivery - standard boats ship within 10-15 business days
- Global shipping - ceramic and PM manufacturers in 30+ countries
FAQ
Q: How do I prevent powder from sticking to the boat?
A: Most ceramic and metal powders release cleanly from machined graphite. For powders that tend to stick (especially oxides), dust the interior with a thin layer of boron nitride (BN) spray or alumina powder before loading. We can also supply boats pre-coated with BN for critical applications.
Q: How long does a graphite sintering boat last?
A: Under typical vacuum or inert atmosphere sintering at 1600-1800°C, a graphite boat lasts 200-500 cycles. Life depends on temperature, powder chemistry, and how often the boat is fully emptied. Re-machining the interior surface can extend boat life by another 100-200 cycles.
Q: Can you supply boats with lids?
A: Yes. We supply matched graphite lids that cover the boat opening, providing controlled atmosphere inside the boat and preventing powder contamination from furnace walls. Lids can be loose-fitting or precision-mated depending on your atmosphere requirements.
Q: What information do you need to quote?
A: Please provide your furnace inner dimensions, the powder type and sintering temperature, the required boat interior dimensions (L x W x H), and how many boats you use per month. Our engineering team will design the optimal boat geometry and wall thickness.
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