Modification of thermo-protective ablation properties of polymer composites with pulveraceous fillers
Wojciech Kucharczyk Politechnika Radomska, Wydział Mechaniczny, Instytut Budowy Maszyn, Zakład Inżynierii Powierzchni i Sprzętu Mechanicznego ul. Malczewskiego 29, 26-600 Radom, Poland
Quarterly No. 3, 2008 pages 274-279
DOI:
keywords: ablative shields and coats, polymer composites, high-fusible fillers, thermo-protective materials
abstract The ablation materials are useful in all kind of thermo-protective systems to design shields and coats – not only in space shuttles and missile constructions, but also in civil applications too. The results of research should be used due the fire protection of modern building constructions and in tunnelling designing. Polymer ablative materials can be used also as protections of electronic, optic and magnetic data. The ablative composites have the better thermo-protective properties when the components have: high density , high thermal capacity cp(t) and small thermal conductivity (t), so small thermal diffusivity too (t) (formula 2). These conditions could be kept by polymer resins with ceramic high-fusible fillers. For example: SiC, Al2O3, WCTiC or tungsten powder W. The ways of modification thermo-protective ablative properties of polymer autonomic shields (with phenolic- of formaldehyde matrix (F-F)) and paint coats with epoxy matrix (E) by high-fusible fillers were presented. The research carried out on this project is an attempt to explain the effect of ablation material components on the average linear rate of ablation va, the mass waste Ua and the back side temperature of specimen ts. Phenolic- of formaldehyde composites have worse thermo-protective ablation properties (va, ts) than epoxy. However (F-F) composites have lower Ua and higher Rm than epoxy have, and this are essential guilds in the case of autonomous shields. The simultaneous use of higher contents: SiC and the tungsten powder W improves all ablation properties of composites.