Formation of inorganic (TaC, TaN) fibers by thermal decomposition of cellulose acetate–tantalum alkoxide precursor gel fibers

Abstract

Precursor gel fiber was formed by extruding cellulose acetate spinning solution into Tantalum (Ta) pentaethoxide acetone solution in a coagulation bath. Gel formation must be due to the coordination of Ta to OH and CO groups on the pyranose ring. The resultant precursor gel fiber was converted into carbide (TaC) or nitride (TaN) fibers by pyrolyzing them in Ar, N 2 , or NH 3 atmospheres.TaC and TaN fibers can be obtained near theoretical temperatures calculated from thermodynamics data.

Polyvinyl butyral‐zirconia hybrid hollow fibers prepared by air gap spinning

“…Up to now, our research group has focused on the interaction between transition metal alkoxides and organic materials to prepare organic–inorganic hybrid gel fibers by air gap spinning. In this manner, Nakane et al confirmed the formation of cellulose acetate (CA)‐zirconium (Zr) alkoxide and CA‐tantalum (Ta) alkoxide gel fiber where CA and metal (Zr, Ta) alkoxides were coordinately bonded 26 …”

“…In this manner, Nakane et al confirmed the formation of cellulose acetate (CA)-zirconium (Zr) alkoxide and CA-tantalum (Ta) alkoxide gel fiber where CA and metal (Zr, Ta) alkoxides were coordinately bonded. 26 Like CA, PVB is a random hydrophilic copolymer having acetyl and hydroxyl groups which can make the same coordinate bond with transition metal as a ligand. 27 Considering the above property of PVB, the formation of PVB-zirconia hybrid films is prepared with excellent thermal and mechanical properties followed by sol-gel method.…”

Materials synthesis using oxide free sol–gel systems

“…3. 3 In an alternative approach, Kumta 4 has reacted early transition metal or aluminium alkoxides with H 2 S or hydrazine to obtain precipitates which can be pyrolysed to metal sulfides or nitrides. These are referred to as thio or hydrazide sol-gel processes.…”

Fabrication of Tantalum and Hafnium Carbide Fibers via ForcespinningTM for Ultrahigh‐Temperature Applications

“…However, most of these methods utilize harsh reagents and halide precursors of the refractory transition metal, which are known to lead to impurities upon degradation (i.e., Cl-contamination). e sol-gel process has demonstrated the feasibility to utilize metal alkoxides (groups IV, V, and VI) to synthesize particles and fibers, with little to no impurities [9][10][11][12].…”