Hidden properties of carbon fiber
Carbon fiber has excellent performance and is favored in many fields. When it comes to carbon fiber, it's natural to think of such performance parameters as specific strength, specific modulus and low density. In fact, in addition to these, carbon fiber has some hidden properties. This article will discuss a hidden property of carbon fiber discrete coefficient.
The hidden property of carbon fiber -- dispersion coefficient
What is the dispersion coefficient of carbon fiber?
The performance span of carbon fiber is very large, from T300 to t1200, light intensity can be divided into many different grades. This is related to the stability of carbon fiber performance, and the dispersion coefficient is a hidden attribute of the stability of carbon fiber.
Practitioners will use CV value to express the dispersion coefficient, which is usually not involved in custom-made carbon fiber products. Only carbon fiber precursor manufacturers and carbon fiber products processing manufacturers have a deep understanding of this property.
The larger the dispersion coefficient of carbon fiber is, the more unstable the quality of carbon fiber is. The dispersion coefficient, also known as the coefficient of variation, represents the deviation degree of two groups of data. There are two sets of data, one is the target data, the other is the actual data. If the deviation between the two is large, the larger the dispersion coefficient is, and the closer the two are, the smaller the dispersion coefficient is.
Effect of dispersion coefficient of carbon fiber
Carbon fiber composites are designable. According to the actual needs of customers, they need carbon fiber products with different shapes and properties. In the process of processing, it will involve the problem of carbon fiber layer, which involves the discrete coefficient. Because the performance parameters of carbon fiber itself, and whether the layer is reasonable, will directly determine whether the performance of carbon fiber products meet the standard.
If the carbon fiber prepreg with high dispersion coefficient is selected, the performance stability of carbon fiber products can not be guaranteed, and the local performance loopholes will directly affect the final use of carbon fiber products. The reason why most of the carbon fiber products received by customers have no performance problems is that the carbon fiber precursor preparation manufacturers and carbon fiber products processing manufacturers have done a good job in advance.
Importance of dispersion coefficient of carbon fiber
The importance of dispersion coefficient of carbon fiber is equivalent to strength and modulus. The strength and modulus are the upper limit of the performance, while the dispersion coefficient is the lower limit. Only the more stable the carbon fiber products are, the higher the lower performance limit will be.
The reason why the preparation of carbon fiber precursor is very difficult is that on one hand, the preparation process of carbon fiber precursor is complex, and it is very difficult to prepare it. On the other hand, the performance of carbon fiber precursor can be maintained at a relatively stable and high level.
If it takes 3-5 years to research and develop carbon fiber precursor, it may take 10-20 years to stabilize the properties of carbon fiber precursor. Compared with Toray, teiren and other carbon fiber enterprises in Japan, some domestic enterprises can also produce carbon fiber tow with high strength and high modulus, but the stability is quite different, which is also a core factor why domestic carbon fiber enterprises are weak in competitiveness.
