Experimental investigation of high-temperature insulation performance of vacuum encapsulated ceramic fiber-board

In this study, a thermal barrier coating (TBC) was used to encapsulate a porous ceramic fiber-board (CFB) under vacuum conditions. The thermal insulation performance and loading-bearing capacity of this structure were experimentally examined and compared to those of the original CFB and an atmospheric pressure encapsulated CFB (APE-CFB). Additionally, the heat transfer process of various specimen was numerically simulated. The thermal insulation experimental findings demonstrate that the 100 μm TBC is proficient in sealing the CFB against high-temperature oxidative ablation and water vapor intrusion in a thermal environment of 1373 K for 3000 s with negligible structural alterations. The TBC diminishes radiative heat transfer inside the CFB, while the vacuum encapsulated CFB (VE-CFB) effectively inhibits the gas heat transfer inside the CFB, substantially enhancing its thermal protection capabilities. Load testes indicate that TBC can increase the compressive capability of original CFB by as much as 73.5 % up to 4.25 MPa within a 10 % deformation range, which is advantageous in the design and application of integrated force-thermal load-bearing structures.