烧结工艺对泡沫玻璃孔结构的影响

摘要

以无碱玻璃粉为主要原料,SiC 为发泡剂,采用粉末烧结法制备了保温泡沫玻璃。采用 XRD、SEM等分析测试手段,研究了烧结温度和保温时间对泡沫玻璃气泡结构、表观密度、气孔率以及抗压强度的影响。结果表明,随着烧结温度的提高和保温时间的延长,泡沫玻璃的表观密度呈下降趋势,平均孔径会逐渐增大,以致产生连通孔现象。当烧结温度为940℃,保温时间为30 min 时制得的泡沫玻璃表观密度为0.46 g/cm3,抗压强度达3.81 MPa,吸水率为0.41%,孔径为1~3 mm的气泡占80%以上。%In this paper,foam glass as thermal insulation material was prepared from alkali-free glass powder by powder-sintering method,the SiC as foaming agent within the process.The influences of sintering temperature and holding time on pore structure,apparent density,porosity and compression strength were studied by scan-ning electron microscope and X-ray diffraction.The results show that,with upgrading the sintering tempera-ture and holding time,apparent density of foam glass declined,average pore size gradually increasing and at the same time connecting pore appear.Under the conditions of sintering temperature of 940 ℃ and holding time of 30 min,the product is with apparent density 0.46 g/cm3 ,compression strength 3.81 MPa,water absorption 0.41% and the pores of the bubble size of 1-3 mm more than 80%.