标题: In the Era of Reusable Rockets, How Can Materials Move from a Constraint to an Active Control Variable? [打印本页] 作者: admin 时间: 2026-11-3 20:12 标题: In the Era of Reusable Rockets, How Can Materials Move from a Constraint to an Active Control Variable? Introduction: Commercial spaceflight is undergoing a profound paradigm shift.
On October 22, 2026, at the Sixth Aerospace Additive Manufacturing Conference, Wang Wei, an expert from China Aerospace Science and Technology Corporation's commercial rocket company, delivered a presentation on reusable rockets and materials innovation. Nanjixiong has compiled the following account of the presentation. It may contain inaccuracies and is provided for reference only.
(, 下载次数: 0)
上传
点击文件名下载附件
A gap remains between China's reusable rockets and international leaders. China's growth is linear, while that of the United States is exponential, setting the context for reshaping material systems.
01 The Essential Gap: The Model, Rather Than Technology
The boom in commercial spaceflight is driven jointly by demand, policy, and technology. On the demand side, Starlink has approximately 11,000 satellites in orbit, compared with a few hundred domestically, making the gap tangible; China has filed for 200,000 satellites. On the policy side, commercial spaceflight has made a three-stage leap in three years: from a new growth engine to a national strategic emerging industry, and then to a new pillar industry.
Falcon 9 completed 165 launches in 2025. By July 2026, it had recorded 639 recoveries in total, with a single rocket reused as many as 36 times, setting a global record for reuse of an individual orbital-class rocket.
In China, reusable rockets have moved from designs on paper into actual validation. They are currently at the stage of having achieved recovery but not yet reuse, making 2026 a key milestone for the domestic industry. Both state-backed and private space companies have carried out relevant validation, but the entire industry chain still needs to catch up comprehensively.
02 Reshaping the Role of Materials: From Using What Is Available to Active Control
The reusable era brings materials from the background to the foreground. Traditional expendable rockets select materials as a constraint, using what is available. Selection is based on mature material systems for products used only once. Aluminum and titanium alloys predominate, while advanced materials are mostly used in preliminary research or non-load-bearing parts.
Reusable rockets are fundamentally different. Their development is generally divided into three stages: first, validate the full return process; second, iterate performance to outperform traditional expendable rockets; and third, optimize efficiency and cost to enable broadly accessible applications across the whole system. China is currently in the first stage.
Each stage adds different requirements for materials. The first requires resistance to instantaneous impact overloads of 12 g, a temperature difference exceeding 1,600 degrees in a single event, and fatigue from 10–20 loading cycles. Materials must also permit inspection, replacement, and repair, with performance restored to more than 95% of a new part after repair. The second stage focuses on lightweighting to avoid a vicious cycle in which greater rocket mass leads to slower deceleration and a need for more propellant. The third examines lifecycle operating cost, balancing stable batch production with convenient maintenance.
Materials thus undergo a fundamental upgrade in role, from a passive constraint to an active control variable. As the presentation put it, their role evolves from ensuring performance to allowing damage provided that it is knowable, controllable, and recoverable. This requires balancing apparently contradictory goals: resistance to extreme environments, low weight, high reliability, low cost, and easy maintenance.
03 Additive Manufacturing: A Key Process for Unlocking Materials Possibilities
Additive manufacturing carries high expectations in balancing the multiple objectives of reusable rockets. Its advantages fall into four areas: weight reduction, integration of complex components, efficiency improvement, and repair and remanufacturing.
For lightweighting, topology optimization and integrated fabrication can reduce the weight of different components by 17%–40%, while the cost of some components can fall to 65% of the original solution. For integration, parts such as engine combustion chambers can consolidate hundreds of components, greatly reducing assembly and joining steps and transforming development methods. For efficiency, connecting digital design and manufacturing can reduce the time from design to a sample of a complex component to just half a month, substantially shortening iteration cycles and reducing prototype costs.
Repair is equally promising. Mature aviation repair technologies such as 3D printing and cold spray can greatly shorten production and maintenance cycles for high-value components, directly supporting reusable rockets' need for inspection, replacement, and repair.
The presentation also offered a measured assessment: “Not every part is suitable for additive manufacturing; there is a cost relationship. Future part manufacturing systems will inevitably combine traditional processes, additive manufacturing, and other processes.” This helps correct overly idealized views of additive manufacturing in the industry.
04 Practical Bottlenecks and Priority Directions
Significant challenges remain in deploying additive manufacturing in aerospace. In design, topology-optimized structures often have poor process compatibility, process modeling lacks sufficient precision, and process constraints are not included in design review procedures, leaving considerable reliance on manual corrections afterward. In manufacturing, complex parts are prone to distortion and cracking, unified inspection and acceptance standards are lacking, and internal cavities are difficult to clean and finish. Residual powder can affect structural stability and inspectability.
Future efforts will focus on several priorities: exploring multifunctional structures by upgrading lightweight lattice structures into integrated multifunctional designs; expanding applications of general-purpose structures by translating weight and load-bearing benefits into lifecycle performance advantages; establishing a quality control system through engineering qualification and unified inspection, release, and quality management; and developing operations, maintenance, and remanufacturing capabilities by drawing on mature aviation repair experience to support rockets throughout their lifecycles.
In closing, the expert noted that Long March 5 production must balance scientific consistency with weight reduction. Manufacturing readiness will play an important role in its transition from final assembly toward batch production. He emphasized that materials are central to taking rockets from feasibility to excellence.
AI-translated from an article by Beijixiong on Nanjixiong, originally published on 2026-10-28. Text and images retain the original source attribution. Read the original Chinese article
欢迎光临 All Voice of China 3D Printing (https://www.panda3dp.com/)