Synthesis of Titania Coated Alumina Particles by a Hybrid Sol-gel Method
Abstract
Modifying their surface with a coating of another ceramic material can dramatically alter the properties of ceramic particles. In the present work we have demonstrated that the Al2O3 particles can he successfully coated by TiO2 using a novel sol-gel technique. The nature of these coatings was predicted on the basis of scanning electron microscopy imaging in conjunction with the micro-Raman scattering measurements. The surface morphology of these particles shows that either individual or group of sub-micron alumina particles ate coated with the nanocrystalline titania particles. The thickness of the titania coating could he varied by changing the precursor sol concentration. Amorphous titania was converted to anatase phase at 400 deg. C and upon further heating it started transforming to rutile phase, and both these phases coexisted in the coated particles that were heat treated up to 800 deg. C. The mechanical strength of the titania coating was measured qualitatively by ultrasonicating the coated powders for longer duration to observe that titania coatings are strongly adhered with the alumina particles.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 2003
- Accession Number
- ADP014244
Entities
People
- A. D. Schmidt
- D. C. Agrawal
- P. S. Dobal
- Ram S. Katiyar
- S. B. Majumder
Organizations
- University of Puerto Rico