Traditionally, foam glass was prepared by adding foaming agents to the waste glass at above 760℃. This method caused large energy consumption and heavy pollution, and the heat resistance of the resulted foam glass was quite low (T≤ 450℃). In this study, a thermal insulation material was prepared by microware heating directly without any foaming agent, using water glass as raw material; the H+ ions of the strong acid replaced the Na+ ions of the prepared foam material, which increased the heat-resistance by 550℃. This new technology can largely decrease the energy consumption and increase the heat resistance. The addition of aluminum silicate fiber not only improves the property of the material, but also increases the heat-insulating property. When the raw material was sodium silicate solution with a molar SiO2Na2O ratio of 2.2, the density of the thermal insulation material was 35kg/m3. If the ratio was 3.2 and the content of aluminum silicate fiber was 1.35%, the thermal conductivity A was the least, 0.064Wm-1K-1. The compressive strength was the highest, about 0.64MPa.%传统的泡沫玻璃是在废玻璃中加入发泡剂以760℃以上发泡制的,此方法不仅耗能大、污染重,而且泡沫玻璃耐热温度过低(T≤450℃).在不添加任何发泡剂下,微波直接加热水玻璃(Na2O3.2SiO2)发泡制备低密度泡沫保温材料；成型的泡沫材料以强酸H+置换Na+,泡沫材料的耐温由450℃提高到1000℃；新工艺降低能源消耗,提高了耐热温度.水玻璃添加少量硅酸铝纤维,不仅能改善泡沫保温材料的隔热性能,同时提高材料的力学性能.水玻璃模数为3.2,硅酸铝纤维含量为1.35％时,保温材料的导热系数为0.064Wm-1K-1；保温材料的抗压强度最高可达0.64MPa.
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