美国真要急哭了，还没弄明白之前的中国隐身技术，现中国又升级了

Core Insights - The article discusses the foundational development and advancements of stealth technology in the U.S. and China's rapid progress in this field, highlighting the competitive dynamics between the two nations [1][3][6]. U.S. Stealth Technology Development - Stealth technology research in the U.S. began in the 1970s, with key contributions from Ben Rich at Lockheed Martin's Skunk Works, leading to significant projects like the F-117 and B-2 bombers [1][3]. - The F-117, developed from 1975 to 1981, achieved unprecedented low detectability through innovative design and radar-absorbing coatings, demonstrating its effectiveness during the Gulf War in 1991 [1][3]. - The U.S. Department of Defense continues to invest heavily in maintaining its stealth technology advantage, allocating $5 billion in 2023 for new stealth material research [3]. China's Stealth Technology Advancements - China began to catch up in stealth technology in the 2010s, with the J-20 stealth fighter entering service in 2017, featuring advanced engines and improved stealth capabilities [3][4]. - In 2024, a breakthrough was achieved with the development of a revolutionary iron-based stealth coating that absorbs electromagnetic waves and reduces infrared radiation by 80%, with a production cost of only $1 per kilogram [4][10]. - The introduction of new materials has significantly enhanced the operational durability of Chinese aircraft, such as the J-20 and J-35, which require less frequent maintenance compared to U.S. counterparts like the F-22 [10][14]. Competitive Dynamics - The competition in stealth technology has intensified, with the U.S. increasing its F-35 upgrade budget in response to China's advancements, although attempts to replicate Chinese materials have been unsuccessful [16][18]. - By 2025, China's stealth aircraft fleet is projected to surpass that of the U.S., with significant investments in military modernization, including a defense budget of $237 billion, 12% of which is allocated for stealth missile projects [14][16]. - The article emphasizes that while the U.S. has historically led in stealth technology, China has emerged as a formidable innovator, potentially reshaping global military balance [18].