Inorganic materials present two different atomic structures, amorphous or crystalline. The structure modification from amorphous to crystalline would higher the operating temperature of the fibers. The conversion from amorphous to crystalline takes place during a heat treatment with a suitable temperature profile.
During this research project inorganic amorphous basalt fibers are converted into basalt ceramic fibers by modulating the temperature profile between a temperature range with high nucleation rate and a temperature range with high crystal growth. Between nucleation temperature and crystal growth temperature, it should be possible to influence the structures without changing the fiber integrity due to partial melting of the fiber surface.
The production of basalt fibers with high thermal stability will allow reducing the costs of fibrous material for thermal application up to 1000°C.
Head of research group Inorganic fiber and recycling, PhD Davide Pico, T. Go, G. Seide, T.Gries, Institut fuer Textiltechnik der RWTH Aachen University, Germany.