High-Purity Isostatic Graphite Evaporation Crucible | Specifically Designed for Vacuum Aluminum Sputtering | NX605

High-Purity Vacuum Deposition Graphite Crucibles: Providing a Pure Evaporation Source for Precision Coating

In vacuum deposition processes, the performance of the evaporation source container directly determines the purity, uniformity, and deposition efficiency of the film. Conventional containers are prone to volatilization at high temperatures and react with molten metals, becoming sources of contamination. Ningheda’s high-purity vacuum evaporation graphite crucibles are specifically designed to address this critical challenge. We utilize isostatic-pressed high-purity graphite substrates to control impurities at the source, ensuring exceptional stability even under extreme operating conditions. This provides a pure and reliable evaporation environment for your optical, semiconductor, and functional thin-film deposition applications.

Key Advantages: Why Choose Ningheda Graphite Crucibles?

Our graphite crucibles are not standard components, but rather precision parts that have been thoroughly optimized to meet the specific requirements of vacuum deposition. Their core advantages lie in three key areas: materials, performance, and manufacturing processes.

• Ultimate Purity Ensures Coating Quality: By using high-purity graphite raw materials (ash content ≤0.05%), we fundamentally eliminate the volatilization of impurities from the crucible itself at high temperatures. This effectively prevents defects such as pitting and pinholes during the coating process, ensuring high surface finish and superior performance for aluminum and other metal coatings.

• High-Density Matrix Resists Severe Corrosion: Through isostatic pressing, our graphite material achieves a high bulk density (≥1.90 g/cm³) and low porosity (≤11%). This dense, uniform microstructure maximizes resistance to penetration and erosion by molten aluminum and gaseous aluminum particles, significantly delaying the corrosion process of the crucible.

• Superior thermomechanical properties ensure process stability: The product combines excellent thermal shock resistance with high mechanical strength (compressive strength ≥70 MPa). Whether subjected to rapid heating and cooling cycles or mechanical stress during equipment operation, the crucible maintains stability, preventing cracking or breakage and ensuring the reliability of continuous production.

• Precision machining enhances operational efficiency: The crucibles feature high dimensional accuracy and smooth inner and outer surfaces. This not only facilitates installation and replacement but also reduces material residue on the walls, improving material utilization. Additionally, graphite’s excellent thermal conductivity (resistivity ≤ 12 μΩ·m) ensures rapid and uniform heat transfer, shortening melting times and reducing energy consumption.

Product Core Technical Specifications Table(Model NX605)

Wide Range of Applications

Ningheda vacuum aluminum-coated graphite crucibles are essential consumables for achieving precision coating in numerous high-tech fields and are widely used in:

Laboratory Grade Graphite Crucible for Vacuum Coating & Gas Analysis

Designed for high-precision laboratory vacuum coating and gas analysis systems, our high-purity graphite crucible features low ash content and zero volatile impurities. It eliminates background contamination during aluminum evaporation, ensuring accurate experimental data and consistent thin film quality for academic and R&D applications.

Graphite Crucible for Electron Beam Evaporation Coating Machine

Optimized for electron beam evaporation coating processes, our high-density graphite crucible withstands extreme temperatures and rapid heating-cooling cycles. Its excellent corrosion resistance resists molten aluminum erosion, delivering uniform, defect-free aluminum thin films for packaging, electronics, and optical coating applications.

High-Density Graphite Crucible for Aluminum Melting in Vacuum Furnace

Built for vacuum furnace aluminum melting and evaporation processes, our high-density graphite crucible features low porosity and exceptional thermal conductivity. It minimizes aluminum penetration and erosion, extends service life, and reduces energy consumption, making it ideal for industrial-scale metal melting and thin film production.

FAQ:

• Q1: Can this crucible be used for vacuum evaporation coating of other metals?

  A: This product is specifically designed for aluminum evaporation. If you need to use it for coating other metals such as copper or silver, please contact us to order a custom-formulated graphite crucible to ensure compatibility and coating quality.

• Q2: How can I tell if the crucible needs to be replaced?

  A: Replacement is recommended under the following circumstances: visible corrosion or flaking on the inner walls of the crucible; deformation that exceeds the equipment’s compatibility range; or frequent quality issues such as impurity spots or pinholes during the coating process.

• Q3: How do I choose the right crucible size?

  A: When selecting a crucible size, you should consider factors such as the type of material to be evaporated, the evaporation volume, and the size of the equipment chamber. You can refer to our product specifications sheet or contact our technical staff, and we will provide you with professional guidance on selecting the appropriate model.

• Q4: What is the typical service life of a crucible?

  A: Under standard vacuum aluminum sputtering processes, the service life is approximately 300–500 cycles, depending on the operating temperature, heating and cooling rates, and operating procedures. Proper use and maintenance can extend the service life.

• Q5: What is the purity level of your graphite crucibles?

  A: We use high-purity graphite raw materials with ash content controlled below 0.05%, ensuring extremely low contamination during the evaporation process.