Research of Combustion Characteristics for Saved Red Lead-Silicon Type Delay Composition

摘要

Through using DTA, microscopic observation, high-temperature storage and second quantity test method to study seven different proportions of red lead and silicon delay composition, the results revealed that: under the same test conditions, for the Pb3O4-Si binary component, the composition can be easily ignited when the content of Pb3O4 is less than 50％.The burning rate would speed up with the increase of Pb3O4 units ranging from 50％ to 70％, and when Pb3O4 reaches at 70％ degree ,the burning rate would be fastest with the most stable combustion and high-temperature storage performance, which further is suitable for low segment based formulation to delay combustion formula.While as the content of Pb3O4 is within 70％-95％ range, the burning rate would decrease with the increment of Pb3O4.Especially when the Pb3O4 surpassed 80％, the delay combustion would tend to display different types of reactions.Early under the influence ot thermal and the Si reaction with O2 form the decomposition of Pb3O4 and the medium-term PbO reaction with Si and the last stage the Si reaction with PbO after the layer of PbO-SiO2 would melt and the oxidation film of SiO2 falling off.Obviously, the main reaction of Pb3O4-Si type delay composition have different types of combustion as the change of Pb3O4 content.