以Na2CO3和不同粒径的镁橄榄石粉(分别为44,74,250 μm)为主要原料,采用熔盐法分别在900,1 000,1 050,1 100 ℃下烧结制备了镁橄榄石轻质保温隔热材料,研究了镁橄榄石粉粒径和烧结温度对所制备材料物相组成、密度和抗压性能的影响.结果表明:所有试样的主要物相均为Mg2SiO4、Na2MgSiO4和MgO,但各物相的含量不同;烧结温度越高,镁橄榄石粉粒径越小,烧结试样的显气孔率越低,体积密度越大,抗压强度越高;粒径为74 μm的镁橄榄石粉为原料经1 000 ℃烧结后得到的试样有比较好的气孔分布和较高的强度,其体积密度为1.76 g·cm-3,抗压强度为12.31 MPa.

Light forsterite thermal insulation materials were synthesized by molten salt method using forsterite powders with particle sizes of 44 ,74 ,250 μm,respectively,and NaCO3 as raw materials,at sintering temperatures of 900,1 000,1 050 ℃ and 1 100 ℃.The effects of forsterite powder particle size and sintering temperature on the phase composition,density and compressive properties of sintered samples were studied.The results show all sintered samples were composed of Mg2SiO4,Na2MgSiO4 and MgO,but were different in phase content.The higher the temperature and the smaller the particle size,the lower the apparent porosity,the higher the bulk density and compressive strength of the sintered samples.The sintered sample with forsterite powder particle size of 74 μm sintered at 1 000 ℃ had better pore distribution and high strength,whose bulk density and compressive strength were 1.76 g·cm-3 and 12.31 MPa.