Carbon and Graphite for Photovoltaic Industry
As the world transitions to renewable energy, solar photovoltaic cells have become a vital component of sustainable power generation. Among all renewable energy sources, photovoltaic offers numerous advantages:
- Unlimited renewable source of energy
- increasing cost competitive
- Environmental friendly
- Decentralized power source
Photovoltaic systems use solar cells to convert sunlight into electricity. The most critical raw materials for producing solar cells in the photovoltaic industry are polysilicon and monocrystalline silicon. For manufacturing both polysilicon and monocrystalline silicon, graphite components are indispensable in these highly sensitive crystal growth processes. Due to its exceptional properties, graphite stands as a unique and irreplaceable material capable of enduring high-temperature corrosion and harsh conditions during production.
Key applications include highly pure graphite electrodes for the deposition of highly pure polysilicon, graphite heaters, crucibles and insulation components for Czochralski pulling of monocrystalline silicon ingots, and PECVD graphite boat.
High-Purity Graphite Electrodes for the Production of Polysilicon
High-purity graphite electrodes (also known as graphite seed chucks) are widely used in reactors and converters for manufacturing high-purity polycrystalline silicon, the raw material for silicon wafers in semiconductors and photovoltaic cells. These electrodes, primarily made from purified isostatic graphite, directly contact silicon seeds during the deposition process.
Key Features:
- Excellent electrical conductivity
- Superior thermal conductivity
- Exceptional chemical resistance
- High Strength
- High purity
Graphite Components for mono silicon crystal growth
Solar cells can be obtained by mono crystalline based silicon solar cells. The silicon wafers are cut out of silicon ingots grown by the Czochralski (CZ) method.
The crystal growing furnaces used for this process operate at high temperatures, around 1500°C. The furnace is equipped with graphite hot zone consisting of a heater, outer tubes, rings, quartz crucible susceptor and other graphite components, depending on the design.
Graphite Components for Polysilicon ingot casting furnaces
When manufacturing the silicon ingots used to form photovoltaic cells, the melting temperature is extremely high at approximately 1,500°C. Our isostatic grpphite has excellent thermal durability, therefore it is used in crucibles, heaters, protective covers for insulation, and other components used in polycrystalline silicon ingot casting furnaces.
PECVD graphite boat
Introduction of Tubular PECVD
As we all know, in the manufacturing of photovoltaic cells, there is a process called coating anti-reflection film. During this process, PECVD (plasma chemical vapor deposition) technology has the advantages of fast coating forming speed, light wrapping plating, and low cost.
Our graphite boat plays a crucial role in the PECVD coating process of photovoltaic cells. In a tube-style PECVD coating process, the graphite boat acts as a carrier for silicon wafers. The quality of the graphite boat directly affects the uniformity and color consistency of the coating on the surface of the wafer. With our high-quality graphite boat, the PECVD coating process can achieve better results in the solar cell performance.
High Precision in Carbon & Graphite Machining
Precision is important in graphite machining. We meet the industry's most demanding specifications with tolerances. Our attention to detail ensures that every project meets perfectly your requirements.
We stand at the forefront of the carbon and graphite machining industry. We invest our time in ensuring precision, efficiency, and quality in every graphite part. Thanks to our advanced machines and talented workforce. They enable us to produce complex products with the utmost accuracy.
Technical Data of Graphite Material:
Isostatic Graphite
| Property |
KBD-5 |
KBD-6 |
KBD-7 |
KBD-7B |
KBD-8 |
Unit |
| Apparent Density |
1.85 |
1.90 |
1.82 |
1.82 |
1.90 |
g/cm3 |
| Max Grain Size |
13-15 |
8-10 |
8-10 |
13-15 |
8-10 |
µm |
| Ash value |
≤500 |
≤500 |
≤500 |
≤500 |
≤500 |
ppm |
| Specific Electrical Resistivity |
8-10 |
8-9 |
11-13 |
11-13 |
11-13 |
μΩm |
| Flexural Strength |
46 |
55 |
51 |
59 |
60 |
Mpa |
| Compressive Strength |
85 |
95 |
115 |
121 |
135 |
Mpa |
| Shore Hardness |
48 |
53 |
65 |
70 |
70 |
HSD |
| Thermal Expansion (room temperature to 600ºC) |
4.75 |
4.8 |
5.8 |
5.8 |
5.85 |
10-6/ºC |
Molded Graphite
| Property |
KBG-4 |
KBG-5 |
Unit |
| Apparent Density |
≥1.80 |
≥1.85 |
g/cm3 |
| Ash value |
≤500 |
≤500 |
ppm |
| Shore Hardness |
≥40 |
≥45 |
HSD |
| Specific Electrical Resistivity |
≤12 |
≤12 |
μΩm |
| Flexural Strength |
38 |
41 |
Mpa |
| Compressive Strength |
81 |
87 |
Mpa |
| Max Grain Size |
25 |
25 |
μm |
Vibration Graphite
| Property |
TSK |
GSK |
Unit |
| Apparent Density |
≥1.70 |
≥1.72 |
g/cm3 |
| Max Grain Size |
≤2 |
≤0.8 |
mm |
| Specific Electrical Resistivity |
8-10 |
≤8.5 |
μΩm |
| Flexural Strength |
≥12.5 |
≥15 |
Mpa |
| Compressive Strength |
≥28 |
≥35 |
Mpa |
| Porosity |
≤24 |
≤20 |
% |
| Ash value |
≤0.3 |
≤0.3 |
% |
Advanced Production Equipments
Strict Quality Control Ensures High Quality Products
Safe Packing
Question and Answer:
Q:Are you a manufacturer or trading company?
A:We are a manufacture for graphite material and graphite machined products.
Q:How can you gurantee the quality?
A:We have the most advanced equipments in our Lab and professional quality control team.We can gurantee each batch of the product with the stable quality.
Q:Can you offer samples?
A: Yes, we offer samples to test
Q: Delivery time?
A:Around 10 days.
Q: Shipping pot
A: Tianjin or main port in China
Q:Payment terms
A:T/T,LC at sight
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