Enhanced resistance to hypersonic aerodynamic heating of ablative-resistant coating via the ceramic precursor modified expandable graphite
Source abstract
Abstract
The present work focuses on the enhanced resistance of ceramic precursor modified expandable graphite to hypersonic aerodynamic heating of ablative-resistant coating. Expandable graphite (EG) was modified by some coupling agents and boric acid to increase the interaction force between inorganic fillers and epoxy resin phases. A novel epoxy-based ablative-resistant coating is developed using modified EG, zinc borate, E-glass fibers and epoxy resin. The SEM and XPS measurements showed that the silane function groups have been attached on the surface of EG and boric silicon compound was also deposited on the surface of EG as ceramic precursor. Boric silicon compound is deposited on the surface of EG as ceramic precursor. Coating heat-resistant performance tests using Muffle stove showed that the coating with EG modified by ND-42 and boric acid has a uniform expansion of carbon layer with good integrity and high strength. Furthermore, it is observed that the back surface of the samples coated with ablation-resistant coating can be cooled to below 270 ℃ in a thermal test by a FD-04D/E Wind Tunnel, and the uniformly expanded and dense carbon char is seen in the SEM images, which indicated that the coating is characterized by good heat-insulation and heat-resistant parameters.
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Research context
OpenAlex topics: Gas Dynamics and Kinetic Theory · Diamond and Carbon-based Materials Research · Plasma and Flow Control in Aerodynamics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (36)
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