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Effect of laser induced rapid solidification\ud structures on adhesion and bonding characteristics\ud of alumina/silica based oxide to vitreous enamel

By Jonathan Lawrence and Lin Li

Abstract

The present work is concerned with investigating the effects of high power diode laser (HPDL) radiation on the\ud microstructure of an amalgamated alumina/silica based oxide compound (AOC). The main rapid solidification\ud theories, namely constitutional supercooling and the theory of morphological stability, are used to explain the\ud observed microstructural changes in the AOC resulting from HPDL interaction. Without laser treatment of the\ud AOC surface it was impossible to fire the enamel onto the AOC. However, wetting experiments, using a number of\ud control liquids and the sessile drop technique, revealed that laser treatment of the AOC surface significantly altered\ud the wetting characteristics of the AOC and allowed the enamel to bond to the AOC. Accordingly, HPDL treatment\ud was identified as allowing the vitreous enamel to wet the surface by causing a decrease in the enamel contact angle\ud from 118° to 33°. Moreover, no discernible difference was seen in the change in contact angle across the range of\ud rapid solidification microstructures obtained. The actual incidence of rapid surface resolidification, and not the\ud degree of rapid surface resolidification, was therefore identified as being the primary factor governing changes in\ud contact angle. The bonding mechanisms were identified as being principally owing to van derWaals forces, however,\ud some evidence of chemical bonding was also observed. The work has clearly shown that laser radiation can be used\ud to alter the wetting characteristics of the AOC

Topics: H680 Optoelectronic Engineering, H700 Production and Manufacturing Engineering
Publisher: Maney Publishing
Year: 2000
OAI identifier: oai:eprints.lincoln.ac.uk:3191

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Citations

  1. (1984). Adsorption and the Gibbs surface excess’, 95; doi
  2. (1974). Colloid Interface Sci.,
  3. (1984). Dictionary of ceramic science and engineering’, doi
  4. (1944). Faraday Soc., doi
  5. (1986). Fundamentals of solidification’;
  6. (1991). in ‘Engineered materials handbook- Adhesives and sealants’, doi
  7. (1991). in ‘Engineered materials handbook- Ceramics
  8. (1980). in ‘Rapid solidification processing, principles and technologies II: Supercooling and rapid solidification microstructures in metals and
  9. (1992). in ‘Science and technology of building seals, sealants, glazing and waterproofing: Adhesion of silicone sealants to organic-coated aluminium’, doi
  10. (1982). in Proc. of ‘Emergent process methods for high technology ceramics’; doi
  11. (1992). Introduction to the physical metallurgy of welding’; doi
  12. (1991). Laser materials processing’, doi
  13. (1992). Modern ceramic engineering’, 217;
  14. (1999). PhD Thesis,
  15. (1998). Private communication, doi
  16. (1974). Solidification processing’; doi
  17. (1965). Technology of enamels’, doi
  18. (1990). Trans. of the Powder Metallurgy Association of India,
  19. (1997). Upper Saddle River, doi

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