Crucible User Manual
Release date:
2018-11-01
The "KINGBO" brand carbon/carbon composite crucible is a patented product developed by our company using proprietary technology (Patent Nos.: ZL200810031364.0, ZL201120160420.8, ZL201120182573.2, ZL201120182571.3, ZL201120182570.9, ZL201120281366.2), and it has been awarded the title of National Key New Product by the Ministry of Science and Technology. This product boasts features such as safety, cost-effectiveness, and design flexibility, enabling users to maximize loading capacity. Its fully rounded design ensures stable liquid levels during crystal growth, resulting in high yields of uniform-quality crystals—making it the ideal next-generation upgrade for high-purity isostatic graphite crucibles.
I. Manufacturing Standards:
Q/NARM 001-2017 Carbon/Carbon Composite Products
II. Technical Specifications:
|
Density (g/cm³) |
≥1.3 |
|
|
Flexural Strength (MPa) |
≥150 |
|
|
Thermal conductivity (W/m·K) |
∥ |
60 |
|
⊥ |
35 |
|
|
Thermal expansion coefficient (×10⁻⁶/K) |
≤0.9 |
|
|
Ash content (ppm) |
≤200 |
|
III. Maximum Operating Temperature:
In air, the product's maximum operating temperature is 370°C; under vacuum conditions, the maximum operating temperature is 2300°C; and in a protective atmosphere, the product can withstand temperatures up to 2500°C.
IV. Important Notes:
1. Before using the product, it must be loaded into the furnace for empty-load calcination. Refer to the following calcination process:
① During calcination, the bottom of the crucible is positioned in the high-temperature zone of the furnace. A stepwise heating method is employed, and argon gas is not introduced at low temperatures.
② Calcination temperature > 1600℃ (or calcination power exceeds the melting power by approximately 5 kW),
③ Calcination time is (4–8) hours,
④ The calcination process is carried out (1 to 3) times. During multiple baking cycles, any impurities that may have adhered to the furnace interior or the materials being calcined during the previous firing must be thoroughly cleaned before proceeding with the next calcination.
2. Before loading, ensure that the inner and outer surfaces of components such as the crucible holder and carbon/carbon crucible are thoroughly cleaned and securely positioned. Additionally, align the height of the crucible body with the joint between it and the movable base, ensuring a smooth transition. This precaution helps prevent cracks or silicon leakage in the quartz crucible caused by improper installation.
3. When placing the quartz crucible, adjust its position so that the outer diameter of the quartz crucible is 3–8 mm smaller than the inner diameter of the carbon/carbon crucible. This ensures smooth gas escape during heating, thereby reducing potential damage to both the carbon/carbon and quartz crucibles.
4. If a smoldering condition occurs in the carbon/carbon composite crucible during operation, appropriate measures should be taken within the last 20 minutes before shutting down the furnace to slow down the cooling rate of the molten silicon. This will help ensure that the silicon material inside the crucible cools gradually from bottom to top, minimizing the stress caused by thermal expansion during cooling, which could otherwise damage the crucible.
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