Non-oxidic ceramic fiber production, employs organic solvents containing element-organic precursors and organic polymers, spun dry to green fiber

摘要

The spinning solution contains an element-organic (analogous to metallo-organic) precursor. In addition an organic polymer is included, compatible with the precursor. The solution is spun dried to the green fiber. Preferred features: The non oxidic structure is optimized using a polymer containing little or no oxygen. Viscoelasticity is controlled by selection of a suitable element-organic precursor/solvent/organic polymer, such that the loss factor tan delta of the spinning solution at processing temperature, adopts a value of 0.1 - 10, (dynamic measurement on rotary viscometer at angular velocity 100 radians/s). The loss factor of the spinning solution at processing temperature and the cited measurement conditions is about unity. The organic polymer qualitative and quantitative composition and structure, control stoichiometry of the ceramic. During the process, oxygen and water are largely excluded. Thermal transformation of the green fiber into a ceramic fiber, is carried out by pyrolysis.