Alumina Boat for High-Temperature Processing and Laboratory Calcination
ADCERAX is a China-based alumina boat manufacturer with more than twenty years of experience in custom high-temperature ceramics. We produce Al₂O₃ combustion boats, rectangular alumina ceramic boats, deep alumina boat crucibles, and custom alumina boats for calcination, powder heating, debinding, and combustion / elemental analysis. With 95%, 99% and 99.7% purity options, consistent dimensions, and low-warpage forming, our boats fit tube and muffle furnaces, laboratory sample handling, and analyzer consumable lines. Need a size standard boats don’t cover? We build alumina boats to your drawing or furnace envelope
🤝 Send us your length, width, wall thickness, purity, and working temperature — our engineers will review the fit before quoting.
1730°C
Max Operating Temp(99.7% Purity)
Stable for Calcination, Powder Heating & Debinding
Dimensional Stability for Consistent Furnace Loading | Low Warpage for Long, Repeated Thermal Cycles
| Custom sizes to your drawing |
What is Alumina Boat?
An alumina boat is a shallow, open ceramic vessel made from high-purity Al₂O₃ and used to hold powders, granules or small parts during high-temperature processes such as calcination, powder heating, debinding, combustion analysis and thermal treatment. Its rectangular or deep-crucible geometry allows stable loading inside tube furnaces, box furnaces and continuous kilns.
Alumina Boat Crucible Properties & Benefits
Alumina boats stay dimensionally stable at high temperature, with low thermal expansion, high strength, and strong chemical resistance. Their dense, inert body resists warpage over repeated heating cycles and keeps a clean surface that avoids sample contamination.
Alumina Boat Technical Data
| Property | Typical Value | Notes for Users |
|---|---|---|
| Purity Options (Al₂O₃) | 95% / 99% / 99.7% | Most alumina boats for sintering use 99%–99.7% |
| Max Operating Temperature | 1450°C (95%) / 1680°C (99%) / 1730°C (99.7%) | Based on continuous use |
| Flatness / Warpage Control | ≤0.3–0.5% over length | Critical for multi-layer loading |
| Dimensional Tolerance | ±0.2 – ±5mm | Depends on size & machining |
| Density | 3.75–3.93 g/cm³ | Higher purity → higher density |
| Load Capacity | Light-to-medium load (process dependent) | Engineering validation recommended |
| Thermal Shock Behavior | Good with controlled heating/cooling | Avoid rapid quenching |
| Atmosphere Compatibility | Air / inert / vacuum | Not recommended for strong reducing atmospheres |
| Cycle Life | 50–300+ cycles | Depends on load, furnace, and temperature profile |
- This chart displays the typical properties of the alumina crucible boat used in our standard products. Please note: Customized parts may have adjusted characteristics depending on production methods, with specific parameters determined by the the alumina purity grade and sintering process chosen for your application.
Why Engineers Choose Alumina Boats
— no deformation over repeated furnace cycles
— inert body prevents powder contamination
— low warpage for stable multi-layer stacking
— uniform walls and reinforced profiles
China Alumina Ceramic Boat Types
ADCERAX supplies high-quality alumina boats in multiple forms, including rectangular combustion boats, round boats, deep-profile boats, ash boats, and hole-type boats designed for different furnace loading patterns and thermal workflows. Standard dimensions are available, and custom configurations can be produced according to drawings or process requirements.
Front- or end-hole boats that direct airflow through the sample bed for stable, controlled combustion.
Ash boats for ash determination, residue analysis, and loss-on-ignition — uniform heating with less airflow disturbance.
Long, deep boats for sintering, calcination, and powder heating — a stable loading bed for tube and box furnaces.
Long, shallow boats for combustion analysis, ash testing, and oxidation — fast heating with steady gas contact.
Not Sure Which Alumina Boat Fits Your Furnace or Analyzer?
Send your dimensions, drawing, or a current boat sample. Our engineers will confirm the right purity, size, and shape for your process, then reply with a quote and lead time.
Where Alumina Boats Are Used?
Alumina boats are used as consumables in combustion and elemental analysis, tube/muffle furnace sample handling, powder calcination, debinding, sintering support, and high-temperature handling of powders, metals, and laboratory samples.
Analysis — Combustion & Elemental Analysis Consumables
Boats hold powder samples for carbon-sulfur / elemental analysis and thermal-analysis prep.
- Hold powder samples for carbon-sulfur, elemental, and thermal analysis.
- Custom sizes when standard analyzer boats don't fit
Furnace & Lab — Tube / Muffle Furnace & Sample Handling
Boats carry powders and small parts in tube, muffle, and box furnaces for heating, drying, and sample processing.
- Flat, low-warpage bottoms for stable multi-layer loading
- Standard and custom sizes to your furnace envelope
Calcination — Powder Calcination & Catalyst / Battery Materials
Hold powders during calcination, precursor decomposition, and batch heating.
- Consistent dimensions reduce spillage on long runs
- High-purity grades limit sample contamination
Powder Metallurgy — Debinding & Pre-Sintering
Hold green parts and compacts during debinding and pre-sintering.
- Supports slow debinding without binder-residue staining
- Flat bottoms allow aligned multi-layer stacking
Custom Alumina Boat Manufacturer
ADCERAX makes custom alumina boats to your drawing, sample, or furnace envelope — for combustion and elemental analysis, tube/muffle furnaces, calcination, and sintering. We support non-standard shapes, multi-slot and reinforced designs, and 95–99.7% purity, with each design reviewed before production.
Customization Options
Rectangular, deep, and combustion boats in extra-long, extra-short, or non-standard length, width, and wall thickness — confirmed per drawing.
Tighter tolerance on critical features by grinding, defined from your drawing. As-fired tolerance is wider.
Multi-slot, grooves, end holes, reinforced walls, and lids — subject to an alumina machinability review.
Choose 95%, 99% or 99.7% alumina to match your working temperature and contamination limits.
Ground or polished alumina surfaces to a target roughness on request.
Customization Process
Send your drawing, CAD file, sample, or old-part photo with material grade, dimensions, tolerances, and quantity.
Our engineers review the alumina purity route and feasibility, then prototype samples for testing and validation.
Alumina forming, sintering, and CNC grinding, with dimensional, purity, and surface-finish inspection on every batch.
Finished boats are securely packed and shipped worldwide with full documentation via your preferred carrier.
ADCERAX – Professional Alumina Ceramic Boat Factory
ADCERAX is a China-based alumina boat manufacturer, providing custom and mass-production boats for combustion analysis, calcination, ash testing, and powder heating. With in-house forming, sintering, machining, and inspection, we deliver consistent purity, dimensional accuracy, and reliable performance for laboratories, furnace operators, and OEM clients worldwide.
Factory-direct supply with strict quality control from raw material to finished boat.
Engineering support and material advice from prototype to production.
Small batches to volume runs, with complex shapes and tight tolerances.
standard sizes ship when available, custom orders 3–7 weeks.
ADCERAX handles alumina boat forming, high-temperature sintering, precision machining, and inspection in one workflow, from prototype sampling to volume production.
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Precision Forming & Dimensional Accuracy:
Controlled forming and CNC machining give accurate length, width, depth, wall thickness, and corner geometry, with smooth interiors for stable loading and even heat. -
Batch Consistency & Quality Control:
Every batch is checked for purity, density, warpage, and dimensional repeatability, with grain-size and shrinkage control for low-warpage, predictable results. -
Customization & Engineering Support:
Drawing-based custom boats — variable wall height, slots, end holes, reinforced walls, and lids — reviewed against your furnace envelope, airflow, and sample needs.
Stable dimensions, low warpage, and clean inert surfaces for calcination, ash testing, and combustion analysis — for labs, furnace operators, and OEM clients.
| Manufacturing Capabilities Overview | |||
|---|---|---|---|
| Capability Item | Typical Value / Description | ||
| Material Grades | High-purity Al₂O₃ (96–99.7%) with controlled grain size and stable performance up to 1730°C for calcination, combustion, and ash-testing workflows. | ||
| Precision Machining | CNC trimming and finishing with ±0.2 mm (machined); as-fired wider tolerances. Smooth interiors support uniform heating and low contamination. | ||
| Forming & Shaping | Dry pressing, isostatic pressing, casting, and machining for custom shapes: rectangular, round, deep-profile, hole-type, and reinforced designs. | ||
| Flatness & Dimensional Control | Controlled sintering minimizes warpage and ensures consistent density and repeatable dimensions across batches. | ||
| Inspection & Quality Control | 100% inspection for warpage, cracks, density uniformity, and bottom/wall accuracy; optional thermal-cycle and chemical-inertness testing. | ||
FAQs About Alumina Boat
There is no single universal figure: the usable temperature is no-load, grade- and condition-dependent. As a typical no-load reference by purity, alumina boats are specified around 1450 C (95%), 1680 C (99%) and 1730C (99.7%). The real limit for your part depends on load, atmosphere, hold time and geometry, and running below the reference limit gives margin for dimensional stability. Share your temperature, atmosphere and loading so a suitable grade can be confirmed.
Yes. ADCERAX supplies extended shapes such as long combustion boats and furnace boats for tube and box furnaces. For non-standard dimensions, an alumina ceramic boat can be made to your internal furnace space and loading pattern - share the length, width, wall and furnace bore for a feasibility review.
Alumina boats are used to hold powders, granules, small parts and pressed samples during calcination, sintering, heat treatment, ash testing and combustion or elemental analysis. Suitability for a specific melt, salt or coating chemistry depends on the material, temperature and atmosphere, so share your sample type and process and we will confirm whether an alumina boat, or a different material, is the right fit rather than assuming it for every chemistry.
Where charge volume is high, ADCERAX can design deeper boat containers, and where more atmosphere control is needed, lidded or covered boats. Note that a ceramic lid provides a cover, not a guaranteed air-tight seal; the achievable fit and any sealing requirement are reviewed per drawing and duty. Share the volume, atmosphere and handling needs so a suitable depth and lid arrangement can be confirmed.
For an accurate quote, share the overall dimensions, wall thickness, operating temperature, atmosphere, sample type, annual usage and whether the design is standard or custom. ADCERAX then reviews feasibility and proposes options by grade and geometry, with availability and lead time confirmed per order rather than quoted as fixed stock or price.
Higher-purity grades (95%-99.7%) generally show better corrosion resistance, lower creep and more stable dimensions during thermal cycling. 96% alumina suits general heating, while 99.7% alumina is preferred for battery materials, catalysts and analytical workflows that need minimal contamination. These are typical, grade-dependent tendencies; the right grade for your process is confirmed by temperature, atmosphere and contamination limits.
Rectangular boats suit powder calcination, batch preheating and long-part loading. Round or oval boats improve radial heat flow and suit uniform heating of pellets or tablets. Combustion boats are shallow, elongated profiles used for ash testing, combustion analysis and airflow-dependent reactions. The best profile depends on your sample, furnace and loading pattern.
Yes. Dimensions, wall thickness, lips, slots, grooves, multi-cavity layouts, vent patterns and bottom profiles can be tailored to pusher, tube, box and multi-layer firing systems, which helps consistent loading and heat distribution. Share a drawing or the furnace geometry for a feasibility review.
Compared with quartz, alumina withstands higher temperature, resists alkali and acid corrosion and avoids devitrification. Compared with zirconia, zirconia tolerates higher thermal shock and mechanical load, while alumina is a common general-purpose choice for many high-temperature workflows. The right material depends on thermal-shock severity, chemical environment and duty, so the choice is confirmed against your process rather than assumed.
ADCERAX is a China-based manufacturer of alumina boat crucibles, supplying standard and custom sizes to drawing for repeat and larger-volume programs. Rather than fixed stock or price promises, we review your size, purity, temperature and quantity and confirm feasibility, availability and lead time per order, which suits consumable reorder and backup-source programs. Send your specification or a sample for a quote.
What to Send for an Alumina Boat Quote
To quote a custom alumina boat, send what you have:
- Boat type: combustion / rectangular / deep / ash / with-hole
- Dimensions: length, width, height, wall thickness
- Alumina purity: 95% / 99% / 99.7%
- Working temperature and furnace or analyzer type
- Quantity and target lead time
- Drawing, photo, or old-part sample
Alumina boats serve furnace, combustion-analysis, and laboratory workflows. Send your details and our engineers will review the fit before quoting.
*Our team will answer your inquiries within 24 hours.
*Your information will be kept strictly confidential.
info@adcerax.com
Tel:+86-0731-84428843
WhatsApp:+86 19311583352
Within 24 hours
