中文摘要：

以天然镁橄榄石和NaCl为原料,采用熔盐法制备镁橄榄石质隔热材料。研究不同熔盐配比和烧结温度对材料显气孔率、体积密度和耐压强度的影响,并利用X射线衍射仪（XRD）和扫描电镜（SEM）对其相组成及微观形貌进行表征。结果表明,熔融的NaCl提供了液相环境,促进了镁橄榄石的烧结,经过水溶液处理后,NaCl溶于水中,其占据的空间形成了气孔;烧结温度为1 100℃,熔盐含量为50%时,制得的隔热材料有较低的体积密度、较高的显气孔率和耐压强度,气孔分布更均匀,材料的隔热性能较佳。

英文摘要：

Forsterite thermal insulation materials were prepared by the molten salt method,with natural forsterite and NaCl molten salt as raw materials.The influences of different mass ratios and reaction temperatures on thermal insulation materials were investigated.Apparent porosity,bulk density and compressive strength of the samples were characterized,and phase composition and microstructure were analyzed by X ray diffraction and scanning electron microscopy.The results demonstrate that,when the sample is sintered at 1 100 ℃ and the content of molten salt is 50 wt%,the forsterite thermal insulation materials have lower bulk density,higher apparent porosity and higher compressive strength,with uniform distribution of pore size and better heat insulation performance.The reason is that molten NaCl has provided liquid environment and promoted the sintering of forsterite,and pores are formed after the removal of NaCl.