The continuous advancement of aerospace technology imposes extremely stringent requirements on material performance. Ceramic matrix composites (CMCs), as a cutting-edge achievement in modern materials science, have emerged as a key high-performance material. With outstanding properties such as high-temperature resistance, low density, high specific strength and modulus, and excellent chemical stability, CMCs show enormous application potential in the aerospace sector and have become one of the focal points of current research. Gaining an in-depth understanding of the current state and future prospects of CMCs in aerospace applications is of great significance for driving further innovation in aerospace technologies.
As science and technology evolve, aerospace research continues to push towards higher performance and more extreme environments, where materials play a crucial supporting role. Owing to their unique properties, ceramic matrix composites are gradually becoming a vital force in driving technological leaps in aviation.
A ceramic matrix composite is a composite material composed of three parts: a ceramic matrix, a reinforcement, and an interphase layer. The concept of CMCs was first proposed in the 1970s by Professor Roger Naslain at the University of Bordeaux in France. As an alternative to traditional metal alloys, CMCs have many advantages that make them suitable for various structural components in aerospace applications:
Aircraft engines, the “heart” of modern aircraft, constantly strive for improvements in high-temperature capability, weight reduction, and durability. Conventional nickel-based superalloys are limited by melting point and density and struggle to meet the extreme thrust-to-weight ratio and fuel efficiency demands of next-generation engines. With superior high-temperature tolerance, low density, and thermal shock resistance, CMCs are emerging as a revolutionary substitute for traditional alloys in hot-end engine components. From nozzles and combustion parts to turbine sections, CMCs have redefined engine design boundaries and driven propulsion systems towards greater efficiency and environmental sustainability. Recent engineering breakthroughs signal that aircraft engine materials have officially entered the “ceramic era.”
C/SiC and SiC/SiC composites possess sufficient strength, excellent oxidation resistance, and thermal shock resistance under extreme conditions, making them ideal for high-temperature structural parts. For example, the European Space Agency’s Ariane HM7 liquid engine uses C/SiC for the nozzle extension section, operating at combustion chamber pressures of 3.5 MPa and temperatures up to 3350 K, with over 1,600 seconds of full-condition testing. Performance monitoring showed excellent ablation resistance with no detectable material loss or structural degradation, outperforming traditional ablative materials.
French aerospace company Safran, through breakthroughs in interface engineering, developed self-healing CMCs reinforced with high-performance SiC fibers and a boron nitride oxidation barrier, successfully addressing material damage in high-oxidation environments. Safran and Pratt & Whitney jointly tested a CMC-SiC seal segment in the F100 engine series, which passed 1,300 hours of testing—including 100 hours at 1,200°C—demonstrating exceptional high-temperature reliability. The new seal segment weighs only 50%–60% of its metal counterpart while offering superior thermal fatigue performance and longer service life.
Combustion chambers face coupled extreme operating environments, including high-temperature gas erosion, cyclic thermal-mechanical loads, steam and oxygen corrosion, and millisecond-level thermal shocks. Key parts such as flame tubes and liners—large thin-walled rotational structures—are static load-bearing components under moderate loads. Proper use of CMCs can significantly improve high-temperature adaptability, structural weight reduction, and environmental durability. For example, SiCf/SiC liners have undergone full-lifecycle validation and have entered practical application in multiple engines worldwide. The U.S. Integrated High Performance Turbine Engine Technology (IHPTET) program tested SiCf/SiC with environmental barrier coatings (EBCs) for liners, achieving 15,000 hours at temperatures up to 1,200°C while cutting NOx and CO emissions.
Oxide CMCs such as Al₂O₃-based composites, with low thermal conductivity and high thermal shock resistance, have been used in liners as well. Professor Zok’s team at the University of California developed complex-shaped porous mullite and alumina-based CMCs using sol-gel infiltration and in-situ polymerization, reinforced with Nextel 720 fibers.
With growing thrust-to-weight ratios, existing turbine blade structures, high-temperature alloys, and thermal barrier coatings face performance limitations in cooling efficiency and mechanical strength, hindering their ability to meet demands for high-load, long-life operations in extreme conditions.
GE’s F414 engine project tested CMC-SiC turbine guide vanes and rotor blades for 500 full engine cycles. Compared to traditional cooled blades, SiCf/SiC uncooled blades significantly improved temperature capability and debuted in later F136 engine variants. Research on CMC-SiC turbine guide vanes and rotors remains ongoing, with the U.S. EPM and UEET programs advancing new ceramic fibers, interface technologies, matrix densification methods, and advanced EBC coatings.
In China, Northwestern Polytechnical University successfully produced high-pressure SiC/SiC turbine guide vanes using CVD, while AECC Materials Research Institute developed SiCf/SiC turbine guide vanes via Reactive Melt Infiltration. Beihang University compared nickel-based superalloys with CMCs for the F119-PW-100 turbofan engine’s low-pressure turbine, designing a novel solid uncooled rotor blade. This innovative blade eliminates the complex traditional cooling system, halving external load on the turbine disk and improving turbine efficiency by 0.98% to 1.17%.
Thanks to exceptional high-temperature performance, lightweight nature, and thermal shock resistance, CMCs are becoming core materials for aircraft structural parts, especially in high-temperature regions such as wing leading edges.
The U.S. X-37B’s wing leading edges were among the first to use reinforced monolithic fiber oxidation-resistant ceramic tiles. These combine carbon-based and silicon-based porous ceramics to provide both high-temperature resistance and efficient insulation, withstanding extreme temperatures up to 1,697°C while maintaining structural integrity. Its flaps and elevons are made of C/SiC composites with SiC matrices reinforced with T-300 grade carbon fiber, densified using Chemical Vapor Infiltration (CVI) and protected by SiC-based EBCs to withstand the extreme aerodynamic heating at speeds up to Mach 25.
China’s National Key Laboratory for Ultra-High Temperature Structural Composites at Northwestern Polytechnical University has made breakthroughs in engineering applications of advanced CMCs. The lab’s self-developed Cf/SiC composites have replaced critical hot-end components in aircraft. By optimizing fiber preform design and CVI processes, they achieved integrated manufacturing of complex parts like wing leading edges and nose cones, which have been successfully deployed on aircraft.
CMC use is also expanding to fuselage frames, especially where high-temperature resistance and lightweight design are required. For instance, the European Space Agency’s IXV vehicle uses an integrated C/SiC thermal protection system with high-rigidity, high-temperature CMC panels to withstand the intense plasma flow during re-entry, maintaining structural integrity through optimized fiber weaving and matrix densification processes.
With their high-temperature tolerance, low density, and high specific strength and modulus, CMCs have become revolutionary aerospace materials. Their performance depends on the ceramic matrix, reinforcement type, and fabrication process. Different material systems and processing techniques impart unique physical and chemical properties, enabling wide applications across various aerospace components.
However, large-scale application still faces challenges:
As aerospace technology evolves, the demand for multifunctional CMCs will continue to grow, driving the development of next-generation CMCs that combine structural load-bearing, thermal protection, electromagnetic shielding, and more.
