[Knitting Technology] What are the gaps between China's high-grade carbon fiber technology and foreign countries? Check the development of China's carbon fiber composite materials!

I. Progress in the production of carbon fiber precursors in China

China's carbon fiber producers have risen since 2008. The Hengshen Group and Zhongfu Shenying took the lead in achieving 1,000-ton capacity in 2010. Dalian Xingke Carbon Fiber and Bluestar Fiber are also catching up and have no small competitive potential. . However, in terms of product types, especially high-volume carbon fiber technology, there is still a gap between foreign carbon fiber producers. At present, China's T300 grade materials are relatively mature, and T700 and above grades are still in research and development and small-scale trial production. in.

T700 carbon fiber

1. Development of T700

In the past five years, China's T700 military carbon fiber material production technology has gradually matured. According to reports, the T700 production line put into production by Zhongfu Shenying Company is currently the third commercial production line in the world using dry-jet wet-wet spinning process system. In 2014, it won the first prize of the Progressive Science and Technology Award of China Building Materials Group Co., Ltd. Important strategic significance. The domestic T700 has been successfully applied in emerging industries such as wind blades, cable composite cores, pressure vessels and transportation, and is initially used in an aircraft model and aerospace equipment.

2. Development progress of T800

The information obtained from various channels indicates that after the completion of the 25-ton T800 production line in 2012, China's first 1,000-ton T800 production line was laid in March 2014 in Zhenjiang New District, Jiangsu. Jiangsu Hangke invested 600 million yuan and is expected to put into production in 2016. By the end of 2014, Hangke had applied for more than 80 national invention and utility model patents, and formulated 42 carbon fiber production process test specifications. Environmental protection and energy conservation measures reduced product cost by 30%, and product performance was less than 5%. Jiangsu Hangke T800 grade material has the ability to serialize high-performance carbon fiber preparation technology and low cost. Nearly 100% of carbon fiber production raw materials and main equipment come from China.

3. Development of T1000 and higher carbon fiber development

Jiangsu Hangke expects to build a 1000-ton T1000 carbon fiber production line and a 100-ton MJ series high-strength and high-modulus carbon fiber production line in 2020. And the development and industrialization of higher performance fibers such as T1200 and M70J and special composite materials.

Second, the progress of China's carbon fiber composite material production technology

Manual Laying Automation: Most of the advanced composite components used in aviation are still being hand-laid. Most of the key equipments such as prepreg automatic cutting machine and laser projector need to be imported. And for large components, it is still difficult to guarantee the quality and speed of the layup.

Automatic tape laying machine: China is in the stage of starting research. The 6m×20m large-scale automatic tape laying machine developed by Beijing Aeronautical Manufacturing Engineering Research Institute began to be used experimentally in the development of composite components for new aircraft.

Automatic wire laying machine: There have been no reports of domestically produced equipment being put into use.

Automatic tape laying machine technology progress:

In 2006, AVIC Manufacturing established a technical team dedicated to the engineering application of automated material placement. Through solid research in the past decade, it has made great progress. Domestic Chengfei also achieved solid results in related technology research and development and engineering applications.

Carbon fiber automatic wire laying machine

AVIC Composite completed the series of domestic prepreg preparation and tape laying processes and related engineering application verification. It has been used for the wing composite composite siding of new aircraft; for civil aircraft tails, wings and other topics Demand, completed a series of research and verification tests on the tail-tail skin and wing skin. In the high-span purification room of AVIC Composites , the most advanced large-scale automatic belting equipment in China - a 30m × 6.5m tape laying machine, with 32 tow laying capacity, can realize the laying of large composite components put.

China Aviation News reported that Chengfei’s “Study on Precision Manufacturing Technology for Large Composite Panels” passed the results evaluation in 2014.

( 1) For the first time, the composite material automatic laying technology was adopted on the assembly aircraft wing wall panel to solve the technical key of the precise manufacturing of the large composite material integral wall panel, and the process specification standard for automatic tape laying was formulated;

( 2) Developed an automatic on-line detection technology based on laser projection technology, which realized the rapid and accurate detection of automatic tape size, angle and contour, and applied for invention patents;

( 3) A precise filling method for the R-shaped area of ​​the hat-shaped reinforced wall panel based on digital technology is proposed, and a special corner R-zone filling tooling tool is developed to realize the one-step molding manufacturing of the hat-shaped structure;

( 4) The theoretical model of deformation control of composite stiffened panels and the rib drift model are established, which realizes the effective control of the deformation and drift of the hat-shaped stiffened panels.

Chengfei has applied for 4 invention patents and has been successfully applied in the manufacture of large-scale integral wall panels for wing composites. The product quality is stable and reliable. The Sichuan Provincial Science and Technology Appraisal Committee believes that the overall technology of the project is leading domestically and reaches the international advanced level.

In addition, the automatic wire laying machine is similar to the automatic tape laying machine. The most advanced 30m×6.5m wire laying machine in China is also equipped with AVIC composite materials. It is combined with a civil aircraft project to carry out research and engineering verification of automatic wire laying technology. .

Third, China's progress in resin-based prepreg technology

The special production workshop for resin prepreg of AVIC Composites is 15,000 square meters, and 4 sets of large-scale hot-melt prepreg with international advanced level are equipped. Technically, the basic technology of the third-generation high-performance composite materials is basically mastered. The toughness of high-toughness resin composite materials such as 5228E, 9918 and AC531 has reached the high-toughness carbon fiber epoxy prepreg standard (BMS8-276) formulated by Boeing.

On the basis of the third-generation domestic resin-based materials, the AVIC composite material system has carried out engineering application verification of domestic carbon fiber resin-based composite materials, such as: