Effect of resin infiltration on fumed silica-based hermal insulations

摘要

The thermal conductivities and the strengths of fumed silica-based hermal insulations prepared by the dry process and the resin infiltration method ave been studied. Infiltration of the insulation samples prepared by dry processing f mixtures, consisting of fumed silica, ceramic fiber and a SiC opacifier, was erformed to strengthen their binding structure. The high temperature thermal onductivities for the insulation samples obtained by the resin infiltration method vere similar to those for the samples prepared by the dry process. On the other hand, he bending strengths for the former were superior to those for the latter. However, he resin-infiltrated samples were more brittle than the samples obtained by the dry rocess due to the occurrence of rigid bonding between the fibers and the infiltrated esin in the porous insulations. The thermosetting resin solution infiltration method ppeared to be applicable to producing a dust-free fumed silica-based thermal isulation.