Recently, SNEC photovoltaic exhibition was held in Shanghai.
In the PV exhibition, there are many carbon fiber elements, indicating that carbon fiber as a high-end basic material has outstanding applications in many fields.
The material shown in the figure above is a carbon-carbon composite, which is a carbon-fiber and its fabric-reinforced carbon matrix composite. It has a low density (<2.0g/cm3)、高强度、高比模量、高导热性、低膨胀系数、摩擦性能好，以及抗热冲击性能好、尺寸稳定性高等优点，是如今在1650℃以上应用的少数备选材料，最高理论温度更高达2600℃，因此被认为是最有发展前途的高温材料之一。光伏产业中所使用的碳碳复合材料主要是用于制造坩埚，作为熔炼多晶硅或单晶硅的器皿，在氢化炉热场、直拉单晶热场、多晶铸锭炉热场、太阳能电池镀膜等工艺作为关键设备。
In the past, such crucibles were mainly made of high-purity graphite, but high-purity graphite was controlled abroad. Moreover, along with the large-scale production facilities of pull silicon single crystal furnaces and polycrystalline ingot furnaces, graphite materials are difficult to satisfy. Carbon-carbon composite materials have Design and good thermophysical properties, compared with graphite thermal field materials, have a very big advantage.
Carbon-carbon composite crucibles have high technical content and difficulty. At present, there are many companies in China that have overcome technological difficulties and have production capabilities.
The high strength, high modulus, and low density of carbon fiber composites play a significant role in lightweighting. The photovoltaic industry is no exception, such as wafer supports.
In other aspects, carbon fiber is also obvious in the photovoltaic industry.
Photovoltaic Carbon Fiber Scrape Film
In the production process of photovoltaic cells, the effect of screen printing will directly affect the conversion efficiency of the battery. The printing core is the aspect ratio of the silver paste after printing. Therefore, the requirements for screens, silver paste and doctor blades are getting higher and higher. Currently, the gate line The requirements are getting more and more elaborate, from the initial 60um to the current 30um, even finer; and the lightweight effect of carbon fiber scrapers can be made more precise.
The figure above shows the carbon fiber roller, which can be used in the production of photovoltaic film and slitting. The traditional metal roller has a large weight, a slow start-up speed and a large inertia. It not only consumes much energy, but also has a large loss of raw materials and a certain production efficiency. The effect of carbon fiber roller is light weight, hard to wear, uniform pressure, easy to adjust, high precision and so on.
With the maturity of carbon fiber and composite materials technology, people have been deeply involved in the research. Carbon fiber and composite materials will be applied more and more in the photovoltaic industry.