Chapter 4. Porous Aluminum Oxide and Lanthanum Phosphate Fiber Coatings

  1. John B. Wachtman Jr.
  1. E. Boakye and
  2. M. D. Petry

Published Online: 28 MAR 2008

DOI: 10.1002/9780470314876.ch4

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4

Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4

How to Cite

Boakye, E. and Petry, M. D. (1996) Porous Aluminum Oxide and Lanthanum Phosphate Fiber Coatings, in Proceedings of the 20th Annual Conference on Composites, Advanced Ceramics, Materials, and Structures - B: Ceramic Engineering and Science Proceedings, Volume 17, Issue 4 (ed J. B. Wachtman), John Wiley & Sons, Inc., Hoboken, NJ, USA. doi: 10.1002/9780470314876.ch4

Author Information

  1. UES Inc. Dayton OH; R.S. Hay Wright Laboratory Materials Directorate, WPAFB, OH

Publication History

  1. Published Online: 28 MAR 2008
  2. Published Print: 1 JAN 1996

ISBN Information

Print ISBN: 9780470375433

Online ISBN: 9780470314876

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Keywords:

  • porous alumina;
  • lanthanum phosphate;
  • sol-gel and solution precursors;
  • porous alumina coatings;
  • lanthanum phosphate coatings

Summary

3M Nextel 720 fibers were continuously coated with porous alumina and with dense lanthanum phosphate (monazite) using sol-gel and solution precursors. Porous alumina coatings were deposited as alumina-carbon mixtures. The carbon holds the pore space during processing under reducing conditions, and is burned out later. The solution derived lanthanum phosphate coatings were made from trimethyl phosphate/lanthanum nitrate solutions. The La:PO4 molar ratio was varied from 1:1 to 1:3. Some monazite coatings were also made with particulate sols. Both the monazite and alumina/carbon coatings were heat-treated in line at ∼900—1400°C and at a coating speed of 1.4 cm/s. The effects of solution/sol chemistry, concentration, and temperature on the microstructure and morphology of the coatings were investigated.