Durable High Purity Low Ash Content Isostatic Graphite Kiln Sagger Box for High-Temperature Sintering Use

Product Description

Product Description

Product Description

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:

1. 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.

2. 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.

3. 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.
4. 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.

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.

Performance Metrics	Ningheda Isostatic Graphite Saggers	Standard Molded/Extruded Graphite Saggers
Bulk Density	≥ 1.85 g/cm³	1.65 - 1.75 g/cm³
Flexural Strength	≥ 38 MPa	25 - 35 MPa
Porosity	≤ 14% (lower permeability)	18 - 25%
Maximum Particle Size	≤ 25 μm (smoother surface)	≤ 45 μm
Service life (1300°C cycling)	100–150 times (up to 200 times after coating)	50–80 times
Thermal shock resistance	Excellent (uniform microstructure)	Good (anisotropic)

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.

How to Choose the Right Graphite Sagger for Your Process?

Step 1: Determine the Operating Temperature

≤1400°C: Moulded graphite sagger s (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

Company Profile

Certifications

Packaging & Shipping

Our graphite products are packed in professional export-grade plywood crates. Constructed from high-quality multi-layer boards and reinforced with green cross-strapping, the crates are sturdy and durable. Each crate bears detailed labels indicating product specifications, weight, and box number for efficient warehouse management and customs inspection. This packaging solution has been verified through multiple international long-distance shipments, ensuring products arrive at your facility in perfect condition.

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: 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.

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.