碳纤维，两大合作签约

Group 1 - The article highlights two significant partnerships in the carbon fiber industry focused on aerospace composite materials, indicating a growing trend in low-altitude economic applications [2][4] - Changsheng Technology and Weixin Aerospace signed a cooperation framework agreement to jointly develop key projects, including a hybrid power system and eVTOL structural optimization [2][3] - Jiangsu Jicui, Antai Composites, and Light and Fast World signed a collaboration agreement to develop and apply composite materials for low-altitude economic scenarios, emphasizing resource integration and project collaboration [4][5] Group 2 - Changsheng Technology has invested over 3 billion yuan to establish an advanced carbon fiber production line, achieving international leading standards and entering the supply chain for China's C919 aircraft [3] - Weixin Aerospace, founded in June 2023, focuses on next-generation smart air travel products and has a strong research team from key institutions [3] - Antai Composites specializes in aviation-grade carbon fiber composite structures and has collaborated with major aircraft manufacturers, including Airbus and COMAC [5]