Graphite Saggers for Sintering Lithium-Ion Battery Materials | Graphite Holding Molds for High-Temperature Vacuum Furnaces

▍Product Description

From raw materials to manufacturing processes, we set a new standard for high-end graphite saggers.

Traditional graphite saggers are prone to oxidation and cracking, and impurities may contaminate your high-value materials. Ningheda graphite saggers address these issues at the source:

• Premium Raw Materials: We use high-purity isostatic graphite billets with ash content below 500 ppm (customizable to below 100 ppm), eliminating contamination of lithium battery materials or semiconductor devices by metallic impurities (such as iron, copper, and chromium) at the source.

• Advanced Forming Process: Unlike conventional compression molding or vibration molding, isostatic pressing technology imparts an isotropic, uniform microstructure to the material. This ensures consistent expansion and contraction in all directions under rapid cooling and heating conditions, significantly suppressing the formation and propagation of cracks.

• Precision Machining Capabilities: Equipped with large-scale CNC machining centers, we can achieve high-precision machining with a tolerance of ±0.05 mm based on your drawings. Whether it involves complex irregular shapes, porous designs, or ultra-thin walls, we can execute them flawlessly.

• Optional Feature Enhancements: We offer value-added services such as anti-oxidation coatings and high-purity purification treatment (ash content ≤50 ppm) to meet the demands of more advanced applications, including PECVD and semiconductor diffusion processes.

Split-Type Graphite Sagger with Flat Lid

Three-Piece Graphite Sagger Set (Box + Liner + Lid)

Graphite Sagger with Round Handle Lid & Corner Steps

▍Product Advantages

Data-driven comparisons make your choice clear at a glance.

Customization Notes: The specifications listed above are for standard models. We can customize dimensions, wall thickness, number of layers, and special configurations to meet your specific furnace type and process requirements.

▍Summary of Core Advantages

• Longer Service Life, Lower Costs: Higher density and strength directly translate to a longer service life, with a significantly lower cost per use compared to low-cost crucibles.

• Guaranteed Material Purity: Ultra-low ash content and extremely low porosity effectively prevent material migration and external contamination, making it the preferred choice for sintering high-end battery materials and precision alloys.

• Energy Efficiency and Productivity: Excellent thermal conductivity ensures a more uniform temperature distribution within the furnace, shortening sintering cycles and reducing energy consumption by up to 15% in actual tests.

• Dimensional Stability and High Yield: Isostatic materials exhibit minimal deformation at high temperatures, ensuring your products achieve precise geometries and improving the yield of the final product.

Cubic Closed Graphite Sagger with Side Handle

Graphite Sagger Edge Detail - Rounded Corner & Wall Thickness

Bulk Graphite Sagger Production Array - Low Angle View

▍Product Features

Material: High-purity, fine-grained isostatic graphite

Operating Temperature: Up to 3000°C in an inert atmosphere; ≤2200°C recommended in a vacuum or reducing atmosphere

Density Range: 1.78–1.90 g/cm³ (selectable based on requirements)

Ash Content: Standard <600 ppm, High-Purity <500 ppm, Ultra-Pure <300 ppm

Surface Treatment: Precision-machined surface; can be treated with purification, anti-oxidation coating, or silicon carbide coating

Customization Capabilities: Fully customizable to non-standard specifications; production can begin upon receipt of 3D drawings

▍Applications and Benefits

1. Sintering of Anode and Cathode Materials for Lithium-Ion Batteries：

   High purity, contamination-free, low porosity, impermeable, energy-efficient

2. Powder Metallurgy and Sintering of Cemented Carbides：

   Resistant to thermal shock, non-stick for easy demolding, high strength at high temperatures

3. Smelting of Rare and Precious Metals and Superalloys：

   Resistant to extremely high temperatures, corrosion-resistant, and easy to demold to minimize waste

4. Vacuum and Special Atmosphere Heat Treatment： 

   Low outgassing rate, thermal shock resistance, and excellent electrical conductivity

1

2

3

4

▍How to Choose the Right Graphite Sagger for Your Process?

Step 1: Determine the Operating Temperature

≤1400°C: Moulded graphite saggers (Economy grade)

1400–1800°C: Isostatic graphite saggers (Standard grade, recommended)

1800°C or ultra-high purity requirements: Isostatic high-purity graphite + oxidation-resistant treatment (High-end grade)

Step 2: Determine the Loading Method

Flat-bed sintering of powdered material → Choose a shallow, flat-bottomed saggers

Multi-layer stacking for high throughput → Choose a stackable sagger with positioning steps

Precision workpiece positioning → Choose a positioning sagger with grooves or pin holes

Step 3: Determine the Atmosphere Environment

Pure vacuum/inert atmosphere → Standard isostatic graphite

Contains trace amounts of oxygen/water vapor → Recommended to add anti-oxidation impregnation treatment

Strongly reducing atmosphere (H₂) → Graphite purity must be verified to prevent impurity reduction reactions

▍FAQ

• Q1: What information do I need to provide for a quotation?
  A: Please provide material requirements, dimensions (L×W×H or diameter×length), quantity, operating temperature, and application industry. Drawings with tolerance requirements are preferred for accurate pricing.

  
  

• Q2: For which types of high-temperature furnaces is this isostatic graphite sagger primarily designed?

  A: This high-purity graphite sagger is specifically designed for high-temperature vacuum and atmosphere furnace applications. It is perfectly suited for mainstream industrial equipment such as vacuum resistance furnaces, induction furnaces, high-temperature sintering furnaces, brazing furnaces, ion nitriding furnaces, tantalum-niobium rare metal smelting furnaces, and vacuum quenching furnaces. With its high versatility, it serves as a core consumable for various high-temperature sintering, heat treatment, and smelting processes.

  
  

• Q3: What are the temperature resistance and energy-saving performance of this graphite sagger?

  A: The product offers excellent high-temperature resistance and is suitable for various industrial high-temperature sintering applications. Thanks to the material’s high thermal conductivity, heat is distributed evenly within the furnace and the heating rate is fast, which shortens the material sintering and forming time, significantly reduces equipment energy consumption, and helps businesses save energy, cut costs, and improve production efficiency.

  
  

• Q4: How can I tell if a graphite crucible needs to be replaced?

  A: We recommend regularly checking the following three indicators:

  1) Appearance: Look for through cracks or severe flaking along the edges;

  2) Weight: An increase of more than 15% of the original weight (indicating that a significant amount of reactants has penetrated the crucible);

  3) Dimensions: Noticeable warping or deformation of the crucible bottom, which affects stacking stability. If any of these conditions are present, we recommend replacing the crucible immediately.

  
  

• Q5: Besides graphite saggers, what other related products do you offer?

  A: As a one-stop supplier of graphite solutions, we also offer: graphite crucibles, graphite molds, graphite heating elements, graphite sealing rings, graphite tubes/sheets/blocks, EDM graphite electrodes, carbon-carbon composites, and more. This allows for the consolidated procurement of “saggers + accessories,” reducing your supplier management costs.