USING OF HYBRID FLAME RETARDANTS TO INCREASE THERMAL EROSION RESISTANCE FOR ADVANCED COMPOSITE MATERIALS

Abstract

This research aims to attainment two essential purposes : first,  using of inorganic flame retardant which represent zinc borate  to increase the flame retardancy for advanced composite material consist of araldite resin (CY223)  reinforced by hybrid fibers from carbon and Kevlar fibers as a woven roving (º 45 - º 0), by using a surface layer from zinc borate  as a coating layer of (4mm) thickness .Then, this system was exposed to a direct flame generated from gas flame (2000ºC) with different flame exposure distances  (10 mm, 20mm), and study the range of resistance of retardant material layer to the flames and protected the substrate . Second, forming a hybrid flame retardant by added antimony trioxide to zinc borate with various amount(10%,20%,30%) to enhance the retardant action of this material to flame and exposure this hybrid material to same flame temperature and exposure distances and time periods (5-60 sec) and (5-95 sec). Method of measuring the surface temperature opposite to the flame was used to determined the heat transferred to composite material . The best results was obtained with large exposed distance and large percentage from protective layer which is zinc borate with (30%) antimony trioxide