Reporters learned on December 4 from the Science and Technology Department of Shaanxi Province organized appraisal conference for scientific achievements of major scientific innovation projects in Shaanxi Province & mdash; & mdash; Domestication Project of Large Aircraft Carbon Brakes Discs and Application Achievements Appraisal Conference for C/C Composite Materials that the large aircraft carbon brakes discs project with completely independent intellectual property rights developed by Xi'an Chaoma Science and Technology Company, the Fourth Academy of Aerospace, filled the domestic blank, broke the foreign monopoly in this field of civil aircraft main models, realized a leapfrog development of the domestication of large civil aircraft carbon brakes discs and a historical breakthrough of the aerospace new materials technology extension application. The evaluation committee composed of experts including Zhang Litong, Sun Jinliang, Cui Guoliang who are academicians of the Chinese Academy of Engineering unanimously thought that the project had many innovative technologies and independent intellectual property rights, had obtained major breakthroughs in high friction characteristics, long service life and other carbon brakes disc manufacturing technologies, and its product comprehensive performance reached international advanced level. C/C composite materials are a kind of new functional composite materials based on the aerospace high technology research and development. They are currently the only material discovered internationally that all physical properties do not occur attenuation in the high temperature environment above 2000℃, and the sublimation temperature reaches 3800℃. The price of the aircraft carbon brakes disc passing through the appraisal this time is only 50%-60% of similar foreign products, and its promotion and application can save nearly 3 billion yuan cost for China's civil aviation passenger aircraft every year. It is understood that at present, this completely domestically produced large civil aircraft brakes disc has respectively obtained the PMA of Boeing 757, Airbus 318/319/320 and other civil aviation main models carbon brakes discs, and has been put into use in plateau air routes such as Lhasa airport. As early as the late 1970s, the Fourth Academy of Aerospace successfully applied C/C composite materials to aerospace model products. Now it has applied for 54 patents on aircraft C/C brakes discs, among which 20 were authorized and 12 were publicized. At present, the academy is building an industry chain integrating carbon fiber production, carbon fiber products process research and production and application around aerospace new materials. (By correspondent Zhu Zhiqiang, Rong Yuanzhao, reporter Zhang Zhehao)