Preparation Of Microcrystalline Foamed Glass Based On Lead - Free Waste Lamp And Its Performance

The waste glass was used as the main raw material to make Foam glass, foaming agent, foam stabilizer, co-solvent additives and auxiliary agents were added at the same time. The foam glass was regarded as an environmentally friendly and high-quality insulation material because of its insulation, fire and pest resistance, etc. However, it still has not been vigorously promoted due to its low strength. The preparation of high quality foam glass and microcrystalline foam glass were studied in this paper. Differential thermal analysis, SEM and XRD modern testing methods were used to test the performance and structural of the samples, and the results showed that the performance of foam glass can be greatly improved after the microcrystalline treatment.In this paper, the unleaded tube was used as the raw material, and, foaming effect was compared using coal, graphite, calcium carbonate and manganese dioxide as foaming agent. The softening temperature of the glass and the reaction temperature of four kinds of foaming agent were tested by DTA-TG analyzer. The results showed that the softening temperature of the glass powder was650-950℃, the reaction temperature of coal was400-550℃, the reaction temperature of graphite was550-900℃, the reaction temperature of calcium carbonate was600-800℃and the reaction temperature of manganese dioxide was500-600℃and950-980℃What’s more, the property of the samples was superior when the manganese dioxide used as foaming agent. The density was0.56g/mm3, compressive strength was2.87Mpa and thermal conductivity was0.145w/m· K.The effect of the heat treatment and content of the additive on the performance of the foam glass was researched in detail. The results showed that the best foaming temperature was800℃and the foaming time was25min. While the optimal ratio of additives was4%foaming agent,4%flux,7%foam stabilizer and5%auxiliary agent. In this process, the Foam glass with uniform pore, low apparent density and high compressive strength can be made. The blowing agent and the foaming temperature had a greater impact on the performance of foam glass.In this part, the nucleating agent was added in the mixed powder to manufacture the foam glass ceramics. First the transition temperature and crystallization temperature of the glass powder were determined by the differential thermal analyzer. Then the optimum parameters of the heat treatment were determined by the orthogonal means. The results showed that in the process of ceramics, the properties of the samples were mostly affected by the crystallization temperature and nucleation temperature, followed by crystallization and nucleation time. The Best microcrystalline craft of the foam glass ceramics was that the nucleation temperature was590℃, nucleation time was140min, and the crystallization temperature was670℃and crystallization time was90min. A lot of crystals generated in the internal sample Observed by SEM and XRD analysis. The main crystalline phases were fluorite, wollastonite and magnesium titanate. the Compressive strength of foam glass ceramics after optimization was17.5MPa, water absorption was6%, density was0.75g/cm3, thermal conductivity was0.133w/m· K, the average pore diameter was2.11mm.