SiC/ZrC composite fiber, preparation method and use thereof

A preparation method of a SiC/ZrC composite fiber having a diameter of 10 to 70 μm, comprising steps of:

• (1) under protection of an inert atmosphere, mixing liquid polycarbosilane with a zirconium-containing polymer to obtain a hybrid spinning solution, and performing electrospinning to obtain a SiC/ZrC composite fiber precursor;
• and
• (2) crosslinking and thermally treating the SiC/ZrC composite fiber precursor obtained in step (1) in a protective atmosphere to obtain the SiC/ZrC composite fiber;
• wherein the hybrid spinning solution in step (1) has a viscosity of from about 0.5 Pa·s to about 10 Pa·s;
• wherein an injection flow rate for the electrospinning in step (1) is from about 1 mL/h to about 5 mL/h;
• wherein a fiber collecting distance for the electrospinning in step (1) is from about cm to about 20 cm;
• wherein the electrospinning in step (1) is for a period of from about 1 hour to about hours;
• wherein a heating rate for the crosslinking in step (2) is from about 1° C./min to about 5° C./min;
• wherein a temperature for the crosslinking in step (2) is from about 100° C. to about 180° C.;
• wherein the crosslinking in step (2) is for a period of from about 1 hour to about 5 hours;
• wherein a temperature for the thermal treatment in step (2) is from about 1300° C. to about 1800° C.;
• wherein a heating rate for the thermal treatment in step (2) is from about 1° C./min to about 15° C./min;
• and
• wherein the thermal treatment in step (2) is for a period of from about 1 hour to about 5 hours.