Abstract The particle’s surface property plays an important role on controlling the thermal insulation performance of fibrous silica compacts. In the present study, the effect of addition of hydrophobic silica on the thermal conductivity of the fibrous silica compacts is investigated. The measurement was conducted using laser flash method and differential scanning calorimeter (DSC) method. The thermal conductivity of fibrous silica compacts is only 0.042 W/m K. The addition of 5% hydrophobic silica further reduces the thermal conductivity of fibrous silica compacts to 0.033 W/m K. The thermal conductivity reaches a constant value with higher hydrophobic silica content. The flexural strength decreases with the increase of hydrophobic silica content. A compromise between the thermal insulation and strength is needed. The performance of fibrous silica compacts shows strong dependence on the surface structure of glass fibers.

中文翻译：

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疏水性纳米二氧化硅对纤维状二氧化硅压块隔热性能的影响

摘要 颗粒的表面性质对控制纤维状二氧化硅复合体的隔热性能起着重要作用。在本研究中，研究了添加疏水性二氧化硅对纤维状二氧化硅压块的热导率的影响。使用激光闪光法和差示扫描量热仪（DSC）法进行测量。纤维状二氧化硅压块的导热系数仅为 0.042 W/m K。添加 5% 的疏水二氧化硅进一步将纤维状二氧化硅压块的导热系数降低至 0.033 W/m K。随着疏水二氧化硅含量的增加，导热系数达到恒定值. 弯曲强度随着疏水二氧化硅含量的增加而降低。需要在隔热和强度之间进行折衷。