A process for preparing continuous aluminum salt filaments convertible to transparent alumina filaments wherein an aqueous fiber-forming solution of hydrated monochloro aluminum hydroxide is concentrated to 1,500-3,000 centipoises and formed into filaments by extrusion directly into a coagulating bath comprising a liquid selected from the group consisting of isopropyl alcohol, ethyl alcohol, tertiary butyl alcohol, a mixture of ethyl alcohol and acetone and a mixture of isopropyl alcohol and acetone.
This is a continuation of application Ser. No. 225,298, filed Feb. 10, 1972 which is a continuation-in-part of application Ser. No. 67,606, filed Aug. 27, 1970 and both now abandoned.
Aluminum chlorohydrate is prepared by a method comprising (a) forming aluminum methoxide from aluminum alkoxides using methanol; (b) recovering aluminum methoxide as a solid precipitate phase, washing to remove higher alcohols and drying to recover a powder; (c) reacting the recovered powdered aluminum methoxide with dilute hydrochloric acid to form aluminum chlorohydrate.
A new process for producing an inorganic fiber of superior tensile strength and modulus of elasticity, which comprises spinning a spinning solution in organic solvent of polymetaloxane of good spinnability to form a precursor fiber, calcining said precursor fiber, and wherein said solution contains polymetaloxane comprising 0.1-95 mole % of a structural unit represented by the following general formula [A] and 99.9-5 mole % of the following formula [B]: ##STR1## (wherein, M represents a trivalent or tetravalent metal atom, X.sub.1 represents an organic group which is the same as or different from ##STR2## hydrogen, nitro or halogen, X.sub.2 and X.sub.3 represent an organic group other than ##STR3## Y represents an organic group, nitro or halogen, m represents an integer from 1 to 3.).
A liquid precursor system for a filament comprises an aluminium halohydrate complex, a magnesium salt and an organic silicate. The stoichiometry is such that a cordierite fibre is formed on firing the filament.
Alumina fibers are prepared by a method comprising (a) forming aluminum methoxide from aluminum alkoxides using methanol; (b) recovering aluminum methoxide as a solid precipitate phase, washing to remove higher alcohols and drying to recover a powder; (c) reacting the recovered powdered aluminum methoxide with dilute hydrochloric acid to form aluminum chlorohydrate; then (d) concentrating the aluminum chlorohydrate solution under vacuum to desired viscosity.
A ceramic fiber is prepared without the need for a fiber-forming organic polymer or a coagulating bath by forming a homogeneous clear solution from an aluminum halohydrate organic complex dissolved in a mixture of water and a C1-C4 alcohol from which a clear homogeneous precursor filament is drawn and fired, which complex is obtained from an aluminum halohydrate and a polyol containing 2 to 6 carbon atoms and at least 2 hydroxy groups.
