Preparation and characteristic of a temperature resistance buoyancy material through a gelcasting process

摘要: Abstract A novel temperature resistance buoyancy material with hollow glass microspheres (HGMs) as the filler and borosilicate (BG, similar chemical composition to HGMs) high matrix was prepared by a tert-butyl alcohol based on gelcasting process. The effect of solid loading sintering microstructure mechanical properties were investigated. results showed that HGMs bonded together 45 wt.% 700 °C optimal processing parameters fabricate samples best thermal properties, corresponding bulk density, compressive strength, conductivity Young’s modulus 0.92 g/cm3, 14.46 MPa, 0.15 W/m K 1.24 GPa, respectively. exponent m value for fabricated in this work 1.18, lower than open- or closed-cell foams, because sample possess both closed open pores. experimental values from 0.07 0.16 W/m K prediction Hashin–Shtrikman upper bound almost close predicted Landauer’s relation. Only SSL45 which possessed maximum closer bound, while other agreed well Ashby–Gibson model applied porosity ranging 65% 89%. HGMs/BG composite exhibited low excellent resistance, can be used insulation undersea pipeline submarine.