Anti-Oxidation Coating Factory Direct Low Thermal Expansion Graphite Boat for Ceramic

Product Description

Product Description

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 Parameters

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 Boat (Economy Model)	High-Purity  Graphite Boat (Standard Model)	Isostatic Pressed  Graphite Boat  (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 Advantages

• 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.

 

Application

Wide range of applications

 

Applications	Specific uses	The Core Value Offered by Graphite Boat
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 boats? How should I choose between them?

  A: Square boats 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 boats packaged?

  A: They are packed in sturdy wooden crates lined with shock-absorbing foam to ensure safe transport.

 

Contact Information

Get a sample and quote for Square Graphite Boat today

Address: No. 966 Tiangong South Avenue, High-Tech Industrial Park, Fengxin County, Yichun, Jiangxi, China

Ningheda Carbon - A one-stop provider of high-temperature sintering solutions, from graphitization to precision machining