Liang Zhijie, Zhang Xueying, Ma Xiaohui, Liu Mengjie, Du Haiyan, Yan Liwen, Guo Anran, Hou Feng, Liu Jiachen
School of Materials Science and Engineering, Key Lab of Advanced Ceramics and Machining Technology of Ministry of Education, Tianjin University, Tianjin 300072, China.
ACS Appl Mater Interfaces. 2025 Apr 9;17(14):21785-21795. doi: 10.1021/acsami.5c00876. Epub 2025 Mar 28.
Research on high-emissivity coatings for flexible thermal insulation felts used in aerospace vehicles has achieved substantial progress. However, the bonding strength of these systems remains a critical challenge that necessitates further improvement. Herein, a nested-structure high-emissivity coating, comprising a Zr precursor-based shell integrated with an AlO-MoSi-SiC (AMS) layer, is applied on alumina fiber fabric (AFF). The nested-structure Zr precursor-based shell not only improves interfacial properties through structural design but also effectively enhances thermal insulation by facilitating multiple reflections and absorptions of infrared radiation. The Zr precursor shell penetrates into the interior of the fiber fabric, providing direct thermal protection to the fiber matrix. Simultaneously, at high temperatures, it reacts with the surface high-emissivity coating to form a ZrSiO-modified mechanical interlocking structure, thereby significantly enhancing the bonding strength. The bonding strength between the nested-structure precursor composite coating (NPCC) and the AFF substrate was measured to be 0.34 MPa at 1300 °C, showing an 80% enhancement compared to that of the single-layer AMS coating. Upon continuous heating at 1445 °C for 10 min using a butane torch, the temperature on the backside of the NPCC-coated AFF remained relatively stable at 212 °C, which is notably decreased by 50 °C compared to that of the single-layer AMS-coated AFF. In the wavelength range of 3-8 μm, the average emissivity of the coating was 0.91. The NPCC significantly enhances both the bonding strength and thermal insulation performance of AFF, offering promising prospects for applications in thermal protection systems.
用于航空航天器的柔性隔热毡的高发射率涂层研究已取得重大进展。然而，这些体系的结合强度仍然是一个关键挑战，需要进一步改进。在此，一种嵌套结构的高发射率涂层被应用于氧化铝纤维织物（AFF）上，该涂层由基于Zr前驱体的壳层与AlO-MoSi-SiC（AMS）层组成。基于Zr前驱体的嵌套结构壳层不仅通过结构设计改善了界面性能，还通过促进红外辐射的多次反射和吸收有效地增强了隔热性能。Zr前驱体壳层渗透到纤维织物内部，为纤维基体提供直接的热保护。同时，在高温下，它与表面高发射率涂层反应形成ZrSiO改性的机械互锁结构，从而显著提高结合强度。嵌套结构前驱体复合涂层（NPCC）与AFF基体之间在1300℃时的结合强度测量值为0.34MPa，与单层AMS涂层相比提高了80%。使用丁烷喷枪在1445℃连续加热10分钟后，NPCC涂层AFF背面的温度保持相对稳定，为212℃，与单层AMS涂层AFF相比显著降低了50℃。在3-8μm波长范围内，涂层的平均发射率为0.91。NPCC显著提高了AFF的结合强度和隔热性能，在热防护系统中的应用前景广阔。
