Graphite Melting Boat is an open boat-shaped melting container precisely CNC-machined from isostatic high-purity graphite, named for its boat-like appearance. Unlike closed ingot molds, it features an open trough design that combines dual functions of melting and temporary holding. Compatible with high-frequency induction furnaces, tube furnaces, muffle furnaces and other heating equipment, it is widely used in small-batch precious metal refining, laboratory alloy proportioning, scrap metal recycling testing, and small-batch special metal forming
Made of ultra-low impurity graphite blank with high-temperature degassing treatment, it has a uniform and dense internal structure without splicing gaps, preventing molten metal penetration that causes contamination and loss. It is a core high-temperature operation consumable for scientific research institutions, small smelters and jewelry customization workshops.
Exclusive application for laboratory research (highly demanded by universities / research institutes)
For research scenarios such as metal material composition analysis, alloy development, and new material preparation, the graphite melting crucible provides a solution for micro-metals melting. The capacity ranges from 5g to 500g, with multiple specifications available. It is compatible with laboratory small-scale melting furnaces. The single melting volume is precisely controllable, meeting the strict requirements of scientific research experiments for component ratios.
The open design facilitates observing the melting state of metals. Combined with customizable cover / with guide port structure, it can perform melting operations under vacuum / inert gas protection, preventing the oxidation of active metals and ensuring the accuracy of experimental data. The inner wall is mirror-polished, and the residual metal amount after the experiment is less than 0.05%, ensuring the reliability of the analysis results.
Customized Melting of Precious Metals (Jewelry Workshop / Main Demand for Personalized Customization)
Serves personalized melting needs for precious metals such as gold, silver, platinum, and K gold. Compatible with small gold melting furnaces in jewelry stores, capable of melting 10g - 2kg of precious metal raw materials in a single operation. Dual-slot / multi-slot design enables simultaneous melting of different purity precious metals, meeting the multi-material combination requirements in jewelry customization.
The graphite purity reaches 99.99%, with impurity content lower than 3ppm. It does not react chemically with precious metals at high temperatures, ensuring that the color of precious metals is not affected. Lightweight design (single piece weight ≤ 500g) is convenient for manual operation, suitable for high-frequency, small-batch jewelry customization production modes. After demolding, the metal surface is smooth, and no secondary polishing is required.
Core performance and product features
Advantages of open melting: Open mold design allows for easy observation of the metal melting process, is compatible with various heating devices, and enables melting operations under vacuum / inert gas protection.
Super pure material guarantee: Fixed carbon content ≥ 99.99%, total impurity content ≤ 3 ppm, among which heavy metals (Fe, Cu, Pb) content ≤ 1 ppm, ensuring that the metal purity is not contaminated.
Outstanding high-temperature resistance performance: Long-term stable working temperature ≤ 1800℃, instantaneous withstand temperature can reach 2800℃, far exceeding the melting temperature requirements of metals such as gold and silver (1064℃/961℃), aluminum (660℃).
| No. | Inspection Item | Technical Standard Parameter | Test Method |
|---|---|---|---|
| 1 | Raw Material | Isostatic High Purity Graphite (≥99.99%) | Carbon Content Analysis |
| 2 | Fixed Carbon Content | ≥99.99% | Combustion Method |
| 3 | Bulk Density | 1.80 – 1.90 g/cm³ | Archimedes Principle |
| 4 | Total Impurity Content | ≤3 ppm (Fe, Cu, Pb ≤1 ppm each) | ICP-MS Detection |
| 5 | Maximum Long-term Working Temperature | ≤1800 ℃ | Thermal Stability Test |
| 6 | Instant Heat Resistance Limit | 2800 ℃ | Flash Heating Test |
| 7 | Internal Porosity | ＜0.3% | Mercury Intrusion Porosimetry |
| 8 | Thermal Expansion Coefficient | 3.5 × 10⁻⁶/℃ (25-1000℃) | Dilatometer Measurement |
| 9 | Thermal Conductivity | 120 – 150 W/(m·K) | Laser Flash Method |
| 10 | Thermal Shock Resistance | ≥800 cycles (RT-1500℃) | Thermal Cycling Test |
| 11 | Surface Roughness (Inner Cavity) | Ra ≤ 0.4 μm | Surface Profilometer |
| 12 | Standard Capacity Range | 5g – 5000g | Volume Calculation |
| 13 | Cavity Customization Options | 1-8 slots, rectangular/trapezoidal/circular | Custom Design |
| 14 | Optional Accessories | Cover, spout, handle, graduation marks | Custom Fabrication |
| 15 | Service Life (Precious Metal Melting) | ≥500 cycles | Practical Application Test |
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