| 摘要 |
Disclosed is an electromagnetic wave absorber, which is lightweight, easy to carry and apply, nonflammable, and applicable to buildings, while having excellent electromagnetic wave absorption characteristics. Also disclosed is a method for producing the electromagnetic wave absorber. Specifically, an electromagnetic wave absorber (1), which is mainly composed of alumina having a porosity within the range of 60-80%, can be obtained by: introducing an alumina ceramic powder (2), a dispersant (3) and distilled water (4) into an alumina pot mill and carrying out ball mill mixing for 24 hours (S10); adding a monomer (5) and a crosslinking agent (6) thereinto and carrying out additional ball mill mixing for 24 hours (S11); defoaming the thus-prepared secondary mixed slurry (S12); then adding a surfactant (7), a polymerization initiator (8) and a polymerization catalyst (9) thereinto and introducing a large amount of air bubbles into the secondary mixed slurry by stirring the slurry with a bubble generator (S13); filling the resulting slurry into a mold (S14); leaving the mold at rest in order to gelatinize the slurry, thereby forming a wet molded body (S15); removing the wet molded body from the mold (S16); drying the wet molded body at 25°C (S17); and then introducing the dried molded body into a firing furnace and carrying out reduction firing (S18). |
