Research On Burning Behavior For The Indoor Ornament Materials

The burning behavior of several woods, foam, plastics, flooring and composites has been studied by means of cone calorimeter, and the thermal degradation, flame retardancy, and smoke suppression of materials were investigated through various parameters such as HRR, MLR, EHC, SPR, SEA, TTI, etc, which were measured from cone calorimeter. The effects of radiate heat flux on various parameters of cone calorimeter and their relationships were also carried out. In the end, burning models related with cone calorimeter were analyzed, and classification on burning behavior for building materials was probed into by the results measured from cone calorimeter. The results can be shown as follows: (1) Fire retardant woods decrease HRR significantly, the amount reduced relates to materials'kind and the contents of fire-retardant pharmaceutical, and prolong the time to ignition. At the same time, the total heat release, specific extinction area and CO2 yield reduce to some extent too while being treated. But the CO yield has not been influenced notably. Besides, the flame retardant woods enhance the amount of char formed. At last, the research shows that heat release rate of the timber products will form two crests while burning. (2) The results demonstrate that heat release rate will vary linearly with the change of the radiate heat flux, this relation is tenable approximately under the condition that the radiation heat flux is higher and doesn't be lower than this low bound of 30kW/m2. According to the linear relations, I have put forward this concept of heat release coefficient, and can judge the complexity that the material burns according to this parameter. Similarly, Where the heat flux is around 30kW/m2 or above and materials are hot-thick materials, time to ignition and radiate heat flux of materials have a certain relation too, that is, TTI-1/2 would vary linearly with the irradiances. (3) When the same kind of material of the same thickness is under the same external condition, the radiate heat flux increases, mass loss will accelerate, total heat release increases, but EHC and CO yield, CO2 yield haven't great change more. The thickness of materials increases, time to ignition will be lengthened. (4) And classification on burning behavior for building materials can be graded according to peak value of heat release rate and total heat release came from cone calorimeter, such hierarchical method has more advantages and stronger scientific than the method in the past, and the one can unify various measured methods. It is the datum measured from cone calorimeter that offer a lot of meaningful contents for setting up the characteristic database of fire, have offered valuable resources that have reference value very much in such aspects as the fire loads, dangerous assessment of fire and performance code and so on for fire research and designer, have laid a certain foundation for the realization of the fire protection safety design.