Sol-gel process for spinning of continuous (Zr, Ce)O2 fibers

✍ Scribed by G. Emig; E. Fitzer; R. Zimmermann-Chopin

• Book ID: 103953461
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 588 KB
• Volume: 189
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/0921-5093(94)90429-4

✦ Synopsis

A sol-gel precursor for the production of continuous fillly stabilized Ce-17mol.%ZrO 2 or Mg-17mol.%ZrO z ceramic fibers was developed using zirconium n-propoxide, cerium(III) chloride or magnesium acetate. The organic additive acetylacetone was used to control the hydrolysis rate, dimethylformamide as a drying control chemical additive and polyethyleneglycol or polyvinylpyrrolidone as a plasticizer. The precursors with acetylacetone-to-Zr molar ratios from 0.3 to 0.75, H20-to-Zr molar ratios from 1.2 to 1.8 and dimethylformamide-to-Zr molar ratios of 2 showed excellent spinnability. Gel fibers were produced in the temperature range from 50 to 100 °C using a piston-driven melt-spinning machine with multifilament spinnerets ( 10-100 holes) in combination with a winding machine. After heat treatment up to 1450 °C the ceramic fibers had diameters of about 40 ~m and consisted of a mixture of tetragonal and cubic (Zr~, s3C% ~7)02 having a density of 98% of the theoretical density.