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▍What is a Square Graphite boat?
A square graphite boat is an open rectangular graphite container. Its structure typically consists of a body (with an internal cavity) and a matching lid (optional), forming a semi-enclosed sintering chamber. The internal dimensions, wall thickness, fillet radius, and bottom flatness of the ark are all customized according to specific sintering processes to accommodate the loading capacity, sintering shrinkage rate, and thermal field distribution requirements of different powdered materials.
The Ningheda series of square graphite boats employs a composite process of compression molding followed by isostatic densification to produce graphite blanks. After graphitization at high temperatures of 2400–2800°C, cavity machining is performed using a five-axis machining center. The finished product exhibits isotropic physical properties, eliminating the axial-radial performance discrepancies commonly found in extruded graphite and ensuring dimensional consistency of the boat during repeated thermal cycling.
▍Product Features and Technical Specifications
Material Grades and Performance Comparison
Based on operating temperature, purity requirements, and budget, we offer graphite blocks in three material grades:
Performance Specifications | Unit | Medium-Coarse Graphite Ark (Economy Model) | High-Purity Graphite Ark (Standard Model) | Isostatic Pressed Graphite Ark (High-End Model) |
Grain size | μm/mm | 0.8mm | ≤25μm | ≤25μm |
Bulk density | g/cm³ | ≥1.72 | ≥1.78 | 1.80 – 1.85 |
Resistivity | μΩ.m | ≤8.5 | ≤12 | ≤11 |
Flexural strength | MPa | ≥15 | ≥35 | ≥38 |
Compressive strength | MPa | ≥35 | ≥70 | ≥80 |
Ash content | % | ≤0.3 | ≤0.06 | ≤0.05（500ppm） |
Typical Applications | -- | General Sintering and Powder Metallurgy | Sintering of lithium-ion battery anode materials | PECVD coating, semiconductors |
Other Key Features
Ash content can be reduced to 30 ppm upon request
The above specifications are standard values and are not guaranteed
▍Our strengths
In-house raw material production: We operate our own graphite raw material production line, ensuring consistent purity and performance, and controlling product quality from the source.
Precision machining: Equipped with multiple high-precision CNC machines, we can machine complex structures with dimensional tolerances within ±0.1 mm.
Cost Control: With an integrated supply chain and no middlemen markups, we provide customers with cost-effective products.
Fast Delivery: We maintain a stock of raw materials, with standard orders delivered within 15–30 days (excluding licensing processing time). Rush orders can be expedited.
Comprehensive Service: We support custom designs based on drawings, offer technical consultation, and provide after-sales support to ensure our customers have complete peace of mind.
▍Wide range of applications
Applications | Specific uses | The Core Value Offered by Graphite Ark |
Lithium-ion battery industry | Sintering vessels for anode and cathode materials in the carbonization and graphitization processes | Structurally stable at high temperatures, does not contaminate materials, and ensures consistent battery performance |
Powder Metallurgy Sintering | High-temperature sintering of cemented carbides, metal powders, and ceramic materials | Holds metal powder, resists deformation at high temperatures, and improves product density and mechanical properties |
Semiconductor Industry | Used for positioning, handling, and protecting wafers and substrates in environments characterized by extreme high temperatures, high purity, and strong corrosion. | Precise grooves and high flatness. Resists cracking and warping at high temperatures, reducing thermal stress cracks. |
Chemical Reaction Apparatus | Inner liner / reaction boat for holding reactants in high- temperature chemical reactors | Available in square, rectangular, and custom shapes, compatible with various types of equipment such as tube furnaces, chamber furnaces, and rotary furnaces |
▍FAQ
Q1: What is the difference between square and round graphite arks? How should I choose between them?
A: Square arks offer higher loading space utilization and can be arranged more closely in roller kilns or pusher kilns, resulting in a 20–30% higher output per unit of kiln volume compared to round arks. Round boats have a more uniform stress distribution, making them suitable for ultra-high temperatures (>2000°C) or applications requiring rotary sintering. For high-volume planar sintering of materials such as lithium-ion battery cathodes, square boats are the more economical choice; for liquid materials like rare earth metal smelting, round boats facilitate more uniform heating.
Q2: What is the minimum order quantity for graphite boats?
A: There is no minimum order quantity. We support sample purchases (samples are free; you only need to cover shipping costs), and volume orders qualify for tiered pricing discounts.
Q3: Can you customize the dimensions to fit our production equipment?
A: Absolutely! Please provide 2D/3D drawings or detailed dimensional specifications. Our engineers will optimize the structural design based on your application to ensure compatibility.
Q4: What is the approximate service life of the product?
A: Depending on operating temperature and conditions, the typical service life is 6–12 months (under standard conditions in the lithium-ion battery industry). In high-temperature, high-frequency applications, it can operate reliably for 3–6 months, far exceeding the industry average.
Q5: How are Graphite Arks packaged?
A: They are packed in sturdy wooden crates lined with shock-absorbing foam to ensure safe transport.
+86-795-4605783 
sales@nhdcarbon.com 
No. 966 of Tiangong South Avenue, High-tech Industrial Park, Fengxin County, Yichun City, Jiangxi Province, China.