复合井盖中碳纤维作用：碳纤维具有强度高、模量高、耐高温、导电等一系列性能，首先在航空航天领域得到广泛应用，近年来在运动器具和体育用品方面也广泛采用。据预测，土木建筑、交通运输、汽车、能源等领域将会大规模采用工业级碳纤维。

1997~2000年间，宇航用碳纤维的年增长率估计为31%，而工业用碳纤维的年增长率估计会达到130%。中国的碳纤维总体水平还比较低，相当于国外七十年代中、末期水平，与国外差距达20年左右。

国产碳纤维的主要问题是性能不太稳定且离散系数大、无高性能碳纤维、品种单一、规格不全、连续长度不够、未经表面处理、价格偏高等。

Role of carbon fiber composite covers: Carbon fiber with high strength, high modulus, high temperature, electrical conductivity and other properties of a series, the first widely used in the aerospace field, in recent years, sports equipment and sporting goods also widely used. According to the forecast, civil construction, transportation, automotive, energy and other areas will be large-scale use of industrial grade carbon fiber.

From 1997 to 2000, with an estimated annual growth rate of aerospace carbon fiber is 31%, while the annual growth rate of industrial use of carbon fiber is estimated to reach 130%. China's overall level of carbon fiber is still relatively low, equivalent to the foreign mid-1970s, the final level, the gap with foreign countries amounted to about 20 years.

The main problem is that the performance of domestic carbon fiber and dispersion coefficient is not stable, non-high-performance carbon fiber, a single species, incomplete specifications, continuous length is not enough, without surface treatment, high prices and so on.