Zr‐doped SiOC ceramics fibers and the high‐temperature thermal performance

Fiberboard (FB) is extensively utilized in heat‐insulating refractory materials owing to its lightweight nature and excellent resistance to high temperatures. Nevertheless, the inadequate mechanical properties and limited dimensional stability of FB hinder its further application. The vacuum filtration was utilized in this study to manufacture inorganically modified insulation FB, incorporating plus fiber/1260 fiber and silica sol as the primary constituents and sepiolite powder (HS) as the modifier. The experimental results show that the fabricated samples exhibited extremely high porosity (75.3%–90.2%) and low thermal conductivity (.063–.15 W m−1 K−1, 200–800°C). The fibers were arranged in a three‐dimensional structure, overlapping with each other, and the silica sol adhered to the fibers, forming a spatial mesh structure through cross‐linking. Importantly, the incorporation of HS was effective in controlling the agglomeration of the silica sol, leading to a more uniform distribution within the fibers. Additionally, the study found that the mechanical properties (high hardness (64–72 HA)) and high‐temperature durability of the FBs were enhanced due to the flocculant modification. This study highlights promising prospects for industrial applications and offers a cost‐effective admixture for modifying and preparing high‐performance FBs, which is expected to see broad adoption in thermal insulation and energy conservation applications.

show abstract

High-temperature resistance and thermal insulation performance of continuous SiMOC ceramic fibers fabricated by the modified sol-gel method combined with dry spinning

Wang,

Chen,

Ahmad

et al. 2024

Preprint

View full text Add to dashboard Cite

Ceramic fibers are ideal candidates for high-temperature resistance material due to their excellent oxidation resistance, ablation resistance, and mechanical properties. In this study, precursor solutions of the continuous SiOC, and SiMOC (M = Al/Zr) ceramic fibers were prepared by a modified sol-gel method. The precursor fibers were fabricated by dry spinning, followed by pyrolysis at 800 ℃, 1000 ℃, and 1200 ℃ to yield continuous SiOC, SiAlOC, and SiZrOC ceramic fibers. The microstructure, surface morphologies, compositions, mechanical properties, and thermal stability of the continuous SiOC and SiMOC ceramic fibers were thoroughly examined by relevant characterization tools. The results showed that the continuous SiMOC fibers exhibited smooth surfaces and dense structures with effective formation of Si-O-M bonds. The measured tensile strength of fabricated continuous SiAlOC and SiZrOC ceramic fibers revealed optimum values of 139.8 MPa and 162.4 MPa, respectively, much higher than the continuous SiOC ceramic fibers (124 MPa). The continuous SiMOC fibers demonstrated remarkable resistance to high-temperature ablation and oxidation, maintaining structural integrity after exposure to a butane flame for 60 seconds and heat treatment in air at 1300 ℃ for 1 h. Additionally, the continuous SiZrOC fibers displayed excellent infrared reflectance of 10.28%, suggesting their potential as superior thermal insulation material in high-temperature applications.

show abstract

Zr‐doped SiOC ceramics fibers and the high‐temperature thermal performance

Cited by 5 publications

References 43 publications

Preparation of Al2O3-SiO2 aerogel by ambient pressure drying for thermal insulation application

Preparation of Al2O3-SiO2 aerogel by ambient pressure drying for thermal insulation application

Novel method of fabricating lightweight thermally insulation fibrous composites for energy saving

High-temperature resistance and thermal insulation performance of continuous SiMOC ceramic fibers fabricated by the modified sol-gel method combined with dry spinning

Contact Info

Product

Resources

About