News from China
Updates every hour. Last Updated: 27-Oct-2026 03:16 ET (27-Oct-2026 07:16 GMT/UTC)
Breaking traditional ceramic aerogel processing limits: Room-temperature “ceramic papermaking” coupled with high-temperature CVI creates multiscale SiC fiber/nanowire aerogels for broadband EMW absorption and thermal protection integration
Tsinghua University PressPeer-Reviewed Publication
Hypersonic vehicles and reusable spacecraft demand lightweight thermal protection systems that can withstand extreme heat while mitigating electromagnetic wave radiation, yet single-scale ceramic architectures typically sacrifice one function for another. Now, researchers have developed a multiscale SiC fiber/nanowire aerogel that breaks this performance trade-off. Inspired by traditional Chinese papermaking, the team combined a scalable room-temperature ceramic papermaking process with high-temperature chemical vapor infiltration (CVI) to fabricate hierarchical aerogels with an ultralow density of 0.23 g·cm-3, a minimum reflection loss of −46.62 dB, and the ability to limit back-surface temperatures to ~250 °C under a 1000 °C flame. Remarkably, prolonged ablation triggers a “fire-strengthening” effect that simultaneously enhances mechanical strength and expands the effective absorption bandwidth from 4.6 GHz to 11.5 GHz—covering 72% of the 2–18 GHz range and fully spanning the C, X, and Ku bands. This work provides a new paradigm for next‑generation extreme‑environment thermal protection materials.
- Journal
- Journal of Advanced Ceramics
New screening strategy for low-conductivity rare-earth tantalates could guide thermal-barrier coating design
Tsinghua University PressPeer-Reviewed Publication
Thermal-barrier coatings rely on ceramic layers that limit heat flow to metal components. A team studying (Gd1−xSmx)TaO4 (GST-x) found that the conventional Klemens-Abeles parameter peaks near x = 0.5. However, room-temperature lattice thermal conductivity is lowest at x = 0.8. From GST-0 to GST-0.8, mean sound velocity fell by about 20%, while conductivity dropped by nearly one-third. Ultrasonic measurements and first-principles calculations linked most of the decline to acoustic softening. Comparison with GST-1 also suggests additional point-defect scattering from Gd/Sm site mixing. The findings could help coating designers choose rare-earth tantalate compositions with lower thermal conductivity.
- Journal
- Journal of Advanced Ceramics
Non-freezing high-active glassy polar nanoregions enable near-zero strain hysteresis in lead-free piezoelectric ceramics
Tsinghua University PressPeer-Reviewed Publication
With the continuous advancement of industrialization, high-precision actuators are increasingly being applied in fields requiring high accuracy, such as aerospace, smart vehicles, and robotics. However, the current mainstream actuator materials on the market are lead-containing ceramics primarily composed of lead zirconate titanate (PZT). During the manufacturing process, these ceramics produce lead and lead oxide, both of which are highly harmful to the environment and human health. Therefore, the development of lead-free ceramics capable of serving as high-precision actuator materials is urgently needed. As the most widely studied lead-free system, perovskites have rightfully become the most extensively investigated lead-free material family. Among them, barium titanate (BaTiO3)-based lead-free ceramics, one of the most promising systems, have attracted widespread research due to their excellent stability and favorable electro-strain properties. However, although phase boundary engineering, the construction of polar nanoregions (PNRs), and defect engineering have partially improved the strain hysteresis of ceramic materials, these advances still fall short of meeting the demands of high-precision actuators.
- Journal
- Journal of Advanced Ceramics
Graded recycling of real-world waste plastics
Tsinghua University PressPeer-Reviewed Publication
Plastic waste should not be viewed as a uniform refuse stream, but as a heterogeneous carbon reservoir whose recycling pathway is dictated by polymer composition, contamination level and degradation history. Here, we outline a graded recycling framework that prioritizes carbon retention rather than technology-driven conversion. Clean and separable plastic streams should first undergo physical recycling to preserve polymer backbones and avoid unnecessary bond cleavage. Mixed, aged or contaminated fractions are better suited to selective chemical routes, including solvolysis, hydrogenolysis, catalytic depolymerization, electrified pyrolysis and gasification, which can reconstruct carbon into monomers, hydrocarbons, syngas or platform chemicals. Biological recycling is most effective for oxygenated intermediates generated through pretreatment. Integrating sorting, safety control and life-cycle assessment, this physical–chemical–biological hierarchy matches each plastic carbon stream with its most valuable and sustainable conversion pathway.
- Journal
- Carbon Future
Novel ultra-fast oxidation testing method at 2300 ℃ reveals “structural-functional element synergy” in multi-principal component diborides
Tsinghua University PressPeer-Reviewed Publication
Ultra-high temperature ceramics (UHTCs) are critical to thermal protection systems for hypersonic vehicles, yet their oxidation behavior above 2000 ℃ remains poorly understood because conventional testing methods have limited applicability. Researchers at Donghua University, China, have developed a novel ultra-fast heating method (100 ℃/s, >2000 ℃) to evaluate the cyclic oxidation behavior of multi-principal component diboride (MEB) ceramics at 2300 ℃. Among the compositions studied, (Zr1/4Hf1/4Ta1/4Ti1/4)B2 exhibited the best performance, forming a dense oxide scale just 99 mm thick that remained intact after five thermal cycles. The team revealed that beyond configurational entropy, the functional element Ti plays a dual role—densifying the outer oxide layer at high temperatures and inducing a stress-relieving porous needle-like Ta2O5 network during cooling. This work establishes a convenient and efficient testing protocol and provides a “structural-functional element synergy” design principle for reusable thermal protection materials.
- Journal
- Journal of Advanced Ceramics
Microwave-driven conversion of waste plastics to high-value chemicals:Progress, challenges, prospects
Tsinghua University PressPeer-Reviewed Publication
This review summarizes recent progress in microwave-driven catalytic conversion of waste plastics. It covers the synergy between microwave dielectric heating and catalysis, depolymerization pathways of various plastics, catalyst design and structure-activity relationships, and effects of reaction parameters on product distribution. Key challenges are discussed, including unclear mechanisms, catalyst deactivation, and scale-up difficulties. Future directions are proposed, such as multi-scale mechanistic studies, development of stable catalysts, and continuous-flow reactor design.
- Journal
- Carbon Future
Novel V-solid-solution Cr2TiAlC2 o-MAX ceramics: Preserved out of plane order enables 35% hardness and 5% toughness gains
Tsinghua University PressPeer-Reviewed Publication
MAX phase ceramics are promising candidates for high-temperature structural applications, yet the synthesis of o-MAX phases with out‑of‑plane chemical ordering is constrained by strict elemental compatibility. A research team led by Associate Professors Cheng-Feng Du and Hong Yu from Northwestern Polytechnical University recently reported a series of Cr2(Ti1-xVx)AlC2 (x = 0–0.6) quinary o-MAX materials. They established the V solubility threshold at x = 0.5, beyond which an order-disorder transition occurs. The optimal composition achieves 16.4% higher nanoindentation hardness, 35.2% higher Vickers hardness, and 5.1% higher fracture toughness, demonstrating that site-selective solid solution is a viable route to high-performance MAX ceramics.
- Journal
- Journal of Advanced Ceramics
Electron-deficient nickel tailored by boron for coke-free methane dry reforming
Dalian Institute of Chemical Physics, Chinese Academy Sciences- Journal
- Chinese Journal of Catalysis
Journal of Integrative Medicine expands global reach through EurekAlert!
Journal of Integrative MedicineBusiness Announcement