Alumina Boat

The alumina boat is a high-purity ceramic container for high-temperature furnaces (up to 1700°C). It offers excellent thermal stability, high mechanical strength, and strong corrosion resistance. Ideal for sintering, calcination, and heat treatment, it ensures minimal sample contamination and long service life in extreme conditions.NexusX Advanced Materials, as a premier manufacturer and supplier of high-quality. Alumina (Al2O3) products, focuses on producing high-precision aluminum nitride silicon structural compenents through advanced technologies for diverse application fields.

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Alumina Boat Data Sheet

Purity:	95%, 96%, 99%, 99.5%, 99.7%, 99.95%
Shape:	Rectangle, Boat
Color:	White or Ivory
Density:	3.7-3.98 g/cm³

Alumina Boat Descriptions

The alumina boat is a high-performance ceramic crucible made from high-purity aluminum oxide (Al₂O₃), specifically engineered for high-temperature thermal processing applications. It exhibits excellent thermal stability, withstanding continuous use at temperatures up to 1700°C, along with outstanding resistance to thermal shock and chemical corrosion. The inert nature of alumina prevents unwanted reactions with most samples, ensuring material purity during processes such as sintering, annealing, calcination, and evaporation. Rigid and durable, the alumina boat maintains its structural integrity under harsh conditions, making it an ideal choice for laboratory research, metallurgy, ceramics, and semiconductor manufacturing.

Alumina Boat Specifications

Capacity (ML)	Length (mm)	Width (mm)	Height (mm)
1	30	6	7
1	50	11	7
1.5	40	10	8
2.5	50	12	10
3	50	12	9
5	70	14	10
5	75	15	10
10	90	17	11.5
10	75	20	12
15	100	20	13
20	105	22	14.5
25	100	25	15
50	137	27	21
50	100	40	18
100	125	60	20
150	150	70	21
250	180	80	25
400	200	100	28
750	210	110	30

Alumina Boat Advantages

High-Temperature Resistance – Withstands continuous use up to 1700°C without deformation or degradation.
Excellent Thermal Shock Resistance – Can endure rapid temperature changes without cracking.
Chemical Corrosion Resistance – Resists attack from acids, alkalis, and most reactive materials.
High Mechanical Strength – Maintains structural integrity under harsh handling and thermal cycling.
Chemically Inert – Non-reactive with most samples, preventing cross-contamination and ensuring material purity.
Long Service Life – Durable and wear-resistant, reducing replacement frequency and overall cost.
Low Porosity / High Density – Minimizes absorption of molten materials or gases, easy to clean.
Gas-Tight Surface – Suitable for vacuum or controlled atmosphere furnaces.
Versatility – Compatible with various applications: sintering, calcination, annealing, evaporation, and heat treatment.
Customizable Shapes and Sizes – Available in a range of dimensions to fit different furnace types and sample volumes.

Alumina Boat Applications

Sintering of Ceramics and Powders – Used for high-temperature densification of ceramic materials, metal powders, and advanced composites.
Calcination Processes – Ideal for thermal decomposition of chemical compounds, such as carbonates, oxides, and catalysts.
Annealing of Metals and Alloys – Supports metal samples during controlled heating and cooling cycles to relieve internal stresses.
Evaporation in Thin-Film Deposition – Serves as a heating boat for evaporating metals or dielectric materials in vacuum coating systems (e.g., thermal or electron-beam evaporation).
Heat Treatment of Semiconductor Materials – Used in diffusion, oxidation, and annealing steps during semiconductor wafer processing.
Melting and Alloying – Withstands high temperatures for melting precious metals, glass frits, or specialty alloys.
Chemical Vapor Deposition (CVD) – Provides a stable, inert platform for substrates during CVD processes.
Thermal Analysis (TGA/DSC) – Holds small sample quantities in thermogravimetric analyzers or differential scanning calorimeters.
Ash Determination – Used in muffle furnaces to combust organic materials and measure ash content in coal, polymers, or food products.
Powder Metallurgy – Supports green compacts during debinding and sintering to produce net-shaped metal parts.
Catalyst Testing and Characterization – Holds catalyst pellets or powders in high-temperature reactor tubes for activity testing or regeneration studies.
Laboratory R&D and Pilot Production – Widely employed in academic, industrial, and quality control labs for small-batch, high-purity thermal processing.

Alumina Ceramic Machining

Alumina ceramics are produced through methods such as injection molding, die pressing, isostatic pressing, slip casting, and extrusion. After sintering and densification, machining requires diamond grinding techniques. Advanced Ceramic Hub utilizes cutting-edge green and biscuit machining technology to produce more complex components with traditional methods. Our advanced machining center includes drilling, grinding, milling, polishing, sawing, tapping, threading, and turning, enabling the manufacture of alumina ceramic components with tight tolerances and high complexity. During the machining process, the following precautions should be observed:

Shrinkage Control: Alumina ceramics shrink by about 20% during sintering, requiring dimensional adjustments in the green body stage.
Tolerance Control: Precise tolerances are unachievable in the green or pre-sintered state; fine machining should follow sintering.
Diamond Grinding: Post-sintering, high-hardness alumina requires diamond grinding, as conventional methods fall short.
Tool Selection: Diamond-coated tools or grinding wheels are essential to handle ceramic hardness and prevent tool damage.
Temperature Control: Strict temperature management during sintering prevents cracking or deformation.
Stress Management: Excessive stress during machining must be avoided to prevent brittle failure.
Cutting Speed and Feed Rate: Controlled speeds and feeds ensure quality and extend tool life.
Surface Treatment: Post-machining polishing removes defects, enhancing performance and appearance.

Alumina Ceramic Packaging

The Alumina Ceramic products are carefully placed in wooden cases or cartons with additional support from soft materials to prevent any shifting during transportation. This packaging method guarantees the integrity of the products throughout the delivery process.

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FAQ

What is an alumina boat used for?

An alumina boat is used for high-temperature processes such as sintering, calcination, annealing, and evaporation in tube furnaces or muffle furnaces.

What temperature can an alumina boat withstand?

High-purity alumina boats can typically withstand continuous use up to 1700°C, and short-term exposure up to 1800°C.

What is the difference between an alumina boat and a quartz boat?

Alumina boats handle higher temperatures (up to 1700°C) and are more chemically resistant, while quartz boats are limited to about 1200°C and can react with alkalis.

Can an alumina boat be used for metal evaporation?

Yes, alumina boats are widely used as evaporation boats for metals like gold, silver, aluminum, and other dielectric materials in thin-film coating.

Why does an alumina boat crack and how to prevent it?

Cracking is usually caused by rapid temperature changes (thermal shock) or mechanical impact. Prevent it by using slow heating/cooling rates (e.g., 5–10°C/min) and avoiding contact with cold objects.

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